Publications by authors named "Lahcen El Ammari"

226 Publications

Ultrasound-assisted one-pot three-component synthesis of new isoxazolines bearing sulfonamides and their evaluation against hematological malignancies.

Ultrason Sonochem 2021 Oct 9;78:105748. Epub 2021 Sep 9.

Equipe de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, Geophysics, Natural Patrimony and Green Chemistry (GEOPAC) Research Center, Mohammed V University in Rabat, Morocco; Chemical & Biochemical Sciences Green-Process Engineering (CBS) Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Benguerir, Morocco. Electronic address:

In the present study, following a one-pot two-step protocol, we have synthesized novel sulfonamides-isoxazolines hybrids (3a-r) via a highly regioselective 1,3-dipolar cycloaddition. The present methodology capitalized on trichloroisocyanuric acid (TCCA) as a safe and ecological oxidant and chlorinating agent for the in-situ conversion of aldehydes to nitrile oxides in the presence of hydroxylamine hydrochloride, under ultrasound activation. These nitrile oxides could be engaged in 1,3-dipolar cycloaddition reactions with various alkene to afford the targeted sulfonamides-isoxazolines hybrids (3a-r). The latter were assessed for their antineoplastic activity against model leukemia cell lines (Chronic Myeloid Leukemia, K562 and Promyelocytic Leukemia, HL-60).
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http://dx.doi.org/10.1016/j.ultsonch.2021.105748DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8436160PMC
October 2021

Synthesis, crystal structure determination of a novel phosphate AgZnFe(PO) with an alluaudite-like structure.

Acta Crystallogr E Crystallogr Commun 2020 Sep 25;76(Pt 9):1491-1495. Epub 2020 Aug 25.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

Single crystals of AgZnFe(PO) [silver zinc iron phosphate (1.64/1.64/1.36/3)] have been synthesized by a conventional solid-state reaction and structurally characterized by single-crystal X-ray diffraction. The title compound crystallizes with an alluaudite-like structure. All atoms of the structure are in general positions except for four, which reside on special positions of the space group, 2/. The Ag cations reside at full occupancy on inversion centre sites and at partial occupancy (64%) on a twofold rotation axis. In this structure, the unique Fe ion with one of the two Zn cations are substitutionally disordered on the same general position (Wyckoff site ), with a respective ratio of 0.68/0.32 (occupancies were fixed so as to ensure electrical neutrality for the whole structure). The remaining O and P atoms are located in general positions. The three-dimensional framework of this structure consists of kinked chains of edge-sharing octa-hedra stacked parallel to [10]. These chains are built up by a succession of [O] ( = Zn/Fe or Zn) units. Adjacent chains are connected by the PO anions, forming sheets oriented perpendicular to [010]. These inter-connected sheets generate two types of channels parallel to the axis, in which the Ag cations are located. The validity and adequacy of the proposed structural model of AgZnFe(PO) was established by means of bond-valence-sum (BVS) and charge-distribution (CHARDI) analysis tools.
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http://dx.doi.org/10.1107/S2056989020011408DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7472751PMC
September 2020

Antiproliferative and apoptotic activity of new indazole derivatives as potential anticancer agents.

Arch Pharm (Weinheim) 2020 Dec 18;353(12):e2000173. Epub 2020 Aug 18.

Laboratory of Organic and Analytical Chemistry, Faculty of Sciences and Technics, Sultan Moulay Slimane University, Béni-Mellal, Morocco.

To develop potent and selective anticancer agents, a series of novel polysubstituted indazoles was synthesized and evaluated for their in vitro antiproliferative and apoptotic activities against two selected human cancer cell lines (A2780 and A549). Several compounds showed an interesting antiproliferative activity, with IC values ranging from 0.64 to 17 µM against both cell lines. The most active indazoles were then tested in different pharmacological dilution conditions, adding five new cell lines (A2780, A549, IMR32, MDA-MB-231, and T47D) as targets, confirming their antiproliferative activity. Furthermore, selected compounds were able to trigger apoptosis to a significant extent and to cause, in part, a block of cells in the S phase of the cell cycle, with a concomitant decrease of cells in the G2/M and/or G0/G1 phases and the generation of hypodiploid peaks. However, molecule 7d caused a great increase of cells in G2/M and the appearance of polyploid cells. Altogether, our results suggest a good pharmacological activity for our selected polysubstituted indazoles, which are suggestive of a preferential mechanism of action as cell cycle-specific antimetabolites or as an inhibitor of enzyme activities involved in DNA synthesis, except for 7d, which, on the contrary, seems to have a mechanism involving the microtubule system.
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http://dx.doi.org/10.1002/ardp.202000173DOI Listing
December 2020

Crystal structure of SrCo(OH)(PO), a new hy-droxy-phosphate.

Acta Crystallogr E Crystallogr Commun 2020 Jul 5;76(Pt 7):1022-1026. Epub 2020 Jun 5.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Science, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

Single crystals of strontium tetra-cobalt tris-(orthophosphate) hydroxide, SrCo(OH)(PO), were grown serendipitously under hydro-thermal conditions at 473 K. The crystal structure consists of undulating chains of edge-sharing [CoO] octa-hedra that are linked into (010) layers by common vertices between chains. Adjacent layers are linked along [010] into a framework structure by tetra-hedral [CoO] units and by PO tetra-hedra. The framework delimits channels extending along [100] in which the eleven-coordinate strontium cations are situated. Bifurcated O-H⋯O hydrogen bonds of weak strengths consolidate the crystal packing. The title compound was also characterized by infrared spectroscopy.
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http://dx.doi.org/10.1107/S2056989020007331DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7336777PMC
July 2020

Crystal structure and Hirshfeld surface analysis of (CHNO)[ZnCl(HO)].

Acta Crystallogr E Crystallogr Commun 2020 Apr 10;76(Pt 4):506-509. Epub 2020 Mar 10.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

In the title mol-ecular salt, 1,3-dimethyl-2,6-dioxo-2,3,6,7-tetra-hydro-1-purin-9-ium aqua-tri-chlorido-zincate(II), (CHNO)[ZnCl(HO)], the fused ring system of the cation is close to planar, with the largest deviation from the mean plane being 0.037 (3) Å. In the complex anion, the Zn cation is coordinated by three chloride ions and one oxygen atom from the water ligand in a distorted tetra-hedral geometry. In the crystal, inversion dimers between pairs of cations linked by pairwise N-H⋯O hydrogen bonds generate (10) rings. The anions are linked into dimers by pairs of O-H⋯Cl hydrogen bonds and the respective dimers are linked by O-H⋯O and N-H⋯Cl hydrogen bonds. Together, these generate a three-dimensional supra-molecular network. Hirshfeld surfaces were generated to gain further insight into the packing.
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http://dx.doi.org/10.1107/S2056989020002753DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7133037PMC
April 2020

Crystal structure and Hirshfeld surface analysis of 4-allyl-2-meth-oxy-6-nitro-phenol.

Acta Crystallogr E Crystallogr Commun 2020 Mar 28;76(Pt 3):461-465. Epub 2020 Feb 28.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

The asymmetric unit of the title compound, CHNO, which was synthesized nitration reaction of eugenol (4-allyl-2-meth-oxy-phenol) with a mixture of nitric acid and sulfuric acid, consists of three independent mol-ecules of similar geometry. Each mol-ecule displays an intra-molecular hydrogen bond involving the hydroxide and the nitro group forming an (6) motif. The crystal cohesion is ensured by inter-molecular C-H⋯O hydrogen bonds in addition to π-π stacking inter-actions between the aromatic rings [centroid-centroid distances = 3.6583 (17)-4.0624 (16) Å]. The Hirshfeld surface analysis and the two-dimensional fingerprint plots show that H⋯H (39.6%), O⋯H/H⋯O (37.7%), C⋯H/H⋯C (12.5%) and C⋯C (4%) are the most important contributors towards the crystal packing.
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http://dx.doi.org/10.1107/S2056989020002601DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7057379PMC
March 2020

Synthesis and crystal structure of NaCuIn(PO).

Acta Crystallogr E Crystallogr Commun 2020 Mar 14;76(Pt 3):366-369. Epub 2020 Feb 14.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, B.P. 1014, Rabat, Morocco.

Single crystals of sodium copper(II) indium bis-[phosphate(V)], NaCuIn(PO), were grown from the melt under atmospheric conditions. The title phosphate crystallizes in the space group 2/ and is isotypic with KCuFe(PO). In the crystal, two [CuO] trigonal bipyramids share an edge to form a dimer [CuO] that is connected to two PO tetra-hedra. The obtained [CuPO] units are inter-connected through vertices to form sheets that are sandwiched between undulating layers resulting from the junction of PO tetra-hedra and [InO] octa-hedra. The two types of layers are alternately stacked along [101] and are joined into a three-dimensional framework through vertex- and edge-sharing, leaving channels parallel to the stacking direction. The channels host the sodium cations that are surrounded by four oxygen atoms in form of a distorted disphenoid.
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http://dx.doi.org/10.1107/S2056989020001929DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7057361PMC
March 2020

Crystal structure of silver strontium copper orthophosphate, AgSrCu(PO).

Acta Crystallogr E Crystallogr Commun 2020 Feb 10;76(Pt 2):186-191. Epub 2020 Jan 10.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

Crystals of the new compound, AgSrCu(PO), were grown successfully by the hydro-thermal process. The asymmetric unit of the crystal structure of the title compound contains 40 independent atoms (4 Sr, 4.5 Cu, 1 Ag, 6 P and 24 O), which are all in general positions except for one Cu atom, which is located on an inversion centre. The Cu atoms are arranged in CuO ( = 4 or 5) polyhedra, linked through common oxygen corners to build a rigid three-dimensional motif. The connection of these copper units is assured by PO tetra-hedra. This arrangement allows the construction of layers extending parallel to the (100) plane and hosts suitable cavities in which Ag and Sr cations are located. The crystal-structure cohesion is ensured by ionic bonds between the silver and strontium cations and the oxygen anions belonging to two adjacent sheets. Charge-distribution analysis and bond-valence-sum calculations were used to validate the structural model.
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http://dx.doi.org/10.1107/S2056989020000109DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7001842PMC
February 2020

Crystal structure and Hirshfeld surface analysis of bis-[hydrazinium(1+)] hexa-fluorido-silicate: (NH)SiF.

Acta Crystallogr E Crystallogr Commun 2019 Oct 20;75(Pt 10):1507-1510. Epub 2019 Sep 20.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

In the title inorganic mol-ecular salt, (NH)SiF, the silicon atom at the centre of the slightly distorted SiF octa-hedron [range of Si-F distances = 1.6777 (4)-1.7101 (4) Å] lies on a crystallographic inversion centre. In the crystal, the ions are connected by N-H⋯N and N-H⋯F hydrogen bonds; the former link the cations into [010] chains and the latter (some of which are bifurcated or trifurcated) link the ions into a three-dimensional network. The two-dimensional fingerprint plots show that F⋯H/H⋯F inter-actions dominate the Hirshfeld surface (75.5%) followed by H⋯H (13.6%) and N⋯H/H⋯N (8.4%) whereas F⋯F (1.9%) and F⋯N/N⋯F (0.6%) have negligible percentages. The title compound is isostructural with its germanium-containing analogue.
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http://dx.doi.org/10.1107/S2056989019012672DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6775730PMC
October 2019

Crystal structure, spectroscopic characterization and Hirshfeld surface analysis of -di-aqua-[2,5-bis-(pyridin-4-yl)-1,3,4-oxa-diazole]di-thio-cyanato-nickel(II).

Acta Crystallogr E Crystallogr Commun 2019 Jul 21;75(Pt 7):1046-1050. Epub 2019 Jun 21.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

The reaction of 2,5-bis-(pyridin-4-yl)-1,3,4-oxa-diazole (4-pox) and thio-cyanate ions, used as co-ligand with nickel salt NiCl·6HO, produced the title complex, [Ni(NCS)(CHNO)(HO)]. The Ni atom is located on an inversion centre and is octa-hedrally coordinated by four N atoms from two ligands and two pseudohalide ions, forming the equatorial plane. The axial positions are occupied by two O atoms of coordinated water mol-ecules. In the crystal, the mol-ecules are linked into a three-dimensional network through strong O-H⋯N hydrogen bonds. Hirshfeld surface analysis was used to investigate the inter-molecular inter-actions in the crystal packing.
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http://dx.doi.org/10.1107/S2056989019008727DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6659318PMC
July 2019

Two new glaserite-type orthovanadates: RbKDy(VO) and CsKGd(VO).

Acta Crystallogr E Crystallogr Commun 2019 Jul 21;75(Pt 7):1041-1045. Epub 2019 Jun 21.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

The crystal structures of dirubidium potassium dysprosium bis-(vanadate), RbKDy(VO), and caesium potassium gadolinium bis-(vanadate), CsKGd(VO), were solved from single-crystal X-ray diffraction data. Both compounds, synthesized by the reactive flux method, crystallize in the space group 1 with the glaserite structure type. VO tetra-hedra are linked to DyO or GdO octa-hedra by common vertices to form sheets stacking along the axis. The large twelve-coordinate Cs or Rb cations are sandwiched between these layers in tunnels along the and axes, while the K cations, surrounded by ten oxygen atoms, are localized in cavities.
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http://dx.doi.org/10.1107/S2056989019008685DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6659331PMC
July 2019

Synthesis, crystal structure and Hirshfeld surface analysis of 2-chloro-3-[()-(2-phenyl-hydrazinyl-idene)meth-yl]quinoline.

Acta Crystallogr E Crystallogr Commun 2019 Jul 7;75(Pt 7):964-968. Epub 2019 Jun 7.

Laboratory of Organic and Analytical Chemistry, University Sultan Moulay Slimane, Faculty of Science and Technology, PO Box 523, Beni-Mellal, Morocco.

A new quinoline-based hydrazone, CHClN, was synthesized by a condensation reaction of 2-chloro-3-formyl-quinoline with phenyl-hydrazine. The quinoline ring system is essentially planar (r.m.s. deviation = 0.012 Å), and forms a dihedral angle of 8.46 (10)° with the phenyl ring. The mol-ecule adopts an configuration with respect to the central C=N bond. In the crystal, mol-ecules are linked by a C-H⋯π-phenyl inter-action, forming zigzag chains propagating along the [10] direction. The N-H hydrogen atom does not participate in hydrogen bonding but is directed towards the phenyl ring of an adjacent mol-ecule, so linking the chains weak N-H⋯π inter-actions to form of a three-dimensional structure. The Hirshfeld surface analysis of the crystal structure indicates that the most important contributions to the crystal packing are from H⋯H (35.5%), C⋯H/H⋯C (33.7%), Cl⋯H/H⋯Cl (12.3%), N⋯H/H⋯N (9.5%) contacts.
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http://dx.doi.org/10.1107/S2056989019007692DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6659329PMC
July 2019

Magnetic properties of a new cobalt hydrogen vanadate with a dumortierite-like structure: Co(OH)(HVO)(VO).

Acta Crystallogr C Struct Chem 2019 Jun 28;75(Pt 6):777-782. Epub 2019 May 28.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

The magnetic properties of a novel cobalt-based hydrogen vanadate, Co(OH)(HVO)(VO), are reported. This new magnetic material was synthesized in single-crystal form using a conventional hydrothermal method. Its crystal structure was determined from single-crystal X-ray diffraction data and was also characterized by scanning electron microscopy. Its crystal framework has a dumortierite-like structure consisting of large hexagonal and trigonal channels; the large hexagonal channels contain one-dimensional chains of face-sharing CoO octahedra linked to the framework by rings of VO tetrahedra, while the trigonal channels are occupied by chains of disordered VO pyramidal groups. The magnetic properties of this material were investigated by DC magnetic measurements, which indicate the occurrence of antiferromagnetic interactions.
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http://dx.doi.org/10.1107/S2053229619007186DOI Listing
June 2019

Crystal structure of a new tripotassium hexa-nickel iron hexa-phosphate.

Acta Crystallogr E Crystallogr Commun 2019 Mar 26;75(Pt 3):402-404. Epub 2019 Feb 26.

Laboratoire de Chimie Appliquée des Matŕiaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

A new potassium-nickel iron phosphate, KNiFe(PO), has been synthesized by solid-state reaction and structurally characterized by single-crystal X-ray diffraction and qualitative energy dispersive X-ray spectroscopy (EDS) analysis. The structure is built up by [FeO], [PO], and [NiO] coordination polyhedra, which are linked to each other by edge and corner sharing to form zigzag layers parallel to the plane. These layers are inter-connected by [PO] tetra-hedra and [NiO] octa-hedra common corners, leading to a three-dimensional framework delimiting large channels running along the [100] direction in which the K cations are localized.
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http://dx.doi.org/10.1107/S2056989019002706DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6399685PMC
March 2019

Crystal structure of BaCo(BO).

Acta Crystallogr E Crystallogr Commun 2019 Mar 22;75(Pt 3):388-391. Epub 2019 Feb 22.

Laboratoire de Chimie Appliquée des Matŕiaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

Single crystals of dibarium cobalt(II) bis-(orthoborate), BaCo(BO), have been obtained from the melt. The crystal structure is composed of two isolated (BO) triangles linked to Co cations. The resulting [CoO] square pyramids and the borate anions make up branched rows extending parallel to [010]. The barium cations occupy two sites in the voids of this arrangement and exhibit coordination numbers of nine each. A comparison with the structures of other (BO) compounds reveals a unique five-coordination of the small metal in the title compound instead of four- or six-coordination for the other (BO) compounds with = Cu, Zn, Mg, Ca, or Cd.
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http://dx.doi.org/10.1107/S2056989019002597DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6399684PMC
March 2019

NaMgIn(PO) and AgMgIn(PO) with alluaudite-type structures.

Acta Crystallogr E Crystallogr Commun 2018 Sep 24;74(Pt 9):1358-1361. Epub 2018 Aug 24.

Laboratoire de Chimie Appliquée des Matériaux, Centre Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

Single crystals of two new phosphates, sodium magnesium indium(III) tris-(orthophosphate) and silver magnesium indium(III) tris-(orthophosphate), were obtained from solid-state reactions. The two phosphates are isotypic and exhibit alluaudite-type structures. They are characterized by a cationic disorder of the Mg and In sites and a partial occupation of the Na and Ag sites, respectively. The structure of both phosphates is made up of chains of edge-sharing [(Mg,In)O] octa-hedra extending parallel to [10]. Adjacent chains are linked by PO tetra-hedra to form a three-dimensional framework delimiting two types of channels parallel to [001] in which the monovalent cations are situated. The coordination numbers of the Na cations are 6 and 8, and for both Ag cations 6. The corresponding coordination spheres are considerably distorted.
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http://dx.doi.org/10.1107/S2056989018011799DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6127713PMC
September 2018

Crystal structure of disilver(I) dizinc(II) iron(III) tris-(orthovanadate) with an alluaudite-type structure.

Acta Crystallogr E Crystallogr Commun 2018 Aug 27;74(Pt 8):1155-1158. Epub 2018 Jul 27.

Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.

The title compound, AgZnFe(VO), has been synthesized by solid-state reactions and belongs to the alluaudite structure family. In the crystal structure, four sites are positioned at special positions. One silver site is located on an inversion centre (Wyckoff position 4), and an additional silver site, as well as one zinc and one vanadium site, on twofold rotation axes (4). One site on a general position is statistically occupied by Fe and Zn cations that are octa-hedrally surrounded by O atoms. The three-dimensional framework structure of the title vanadate results from [(Zn,Fe)O] units of edge-sharing [(Zn,Fe)O] octa-hedra that alternate with [ZnO] octa-hedra so as to form infinite chains parallel to [10]. These chains are linked through VO tetra-hedra by sharing vertices, giving rise to layers extending parallel to (010). Such layers are shared by common vanadate tetra-hedra. The resulting three-dimensional framework delimits two types of channels parallel to [001] in which the silver sites are located with four- and sixfold coordination by oxygen.
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http://dx.doi.org/10.1107/S205698901801071XDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6072985PMC
August 2018

Crystal structure of calcium dinickel(II) iron(III) tris-(orthophosphate): CaNiFe(PO).

Acta Crystallogr E Crystallogr Commun 2017 Jun 26;73(Pt 6):893-895. Epub 2017 May 26.

Laboratoire de Chimie du Solide Appliquée, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

The title compound, CaNiFe(PO), was synthesized by solid-state reactions. Its structure is closely related to that of α-CrPO in the space group . Except for two O atoms in general positions, all atoms are located in special positions. The three-dimensional framework is built up from two types of sheets extending parallel to (100). The first sheet is made up from two edge-sharing [NiO] octa-hedra, leading to the formation of [NiO] double octa-hedra that are connected to two PO tetra-hedra through a common edge and corners. The second sheet results from rows of corner-sharing [FeO] octa-hedra and PO tetra-hedra forming an infinite linear chain. These layers are linked together through common corners of PO tetra-hedra and [FeO] octa-hedra, resulting in an open three-dimensional framework that delimits two types of channels parallel to [100] and [010] in which the eightfold-coordinated Ca cations are located.
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http://dx.doi.org/10.1107/S2056989017007411DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5458318PMC
June 2017

Crystal structure of a silver-, cobalt- and iron-based phosphate with an alluaudite-like structure: AgCoFe(PO).

Acta Crystallogr E Crystallogr Commun 2017 Jun 26;73(Pt 6):890-892. Epub 2017 May 26.

Laboratoire de Chimie du Solide Appliquée, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

The new silver-, cobalt- and iron-based phosphate, silver cobalt iron tris(ortho-phosphate), AgCoFe(PO), was synthesized by solid-state reactions. Its structure is isotypic to that of NaCoFe(PO), and belongs to the alluaudite family, with a partial cationic disorder, the Ag atoms being located on an inversion centre and twofold rotation axis sites (Wyckoff positions 4 and 4), with partial occupancies of 0.885 (2) and 0.7688 (19), respectively. One of the two P atoms in the asymmetric unit completely fills one 4 site while the Co and Fe atoms fill another 4 site, with partial occupancies of 0.86 (5) and 0.14 (5), respectively. The remaining Co and Fe cations are distributed on a general position, 8, in a 0.39 (4):0.61 (4) ratio. All O atoms and the other P atoms are in general positions. The structure is built up from zigzag chains of edge-sharing [O] ( = Fe/Co) octa-hedra stacked parallel to [101]. These chains are linked together through PO tetra-hedra, forming polyhedral sheets perpendicular to [010]. The resulting framework displays two types of channels running along [001], in which the Ag atoms (coordination number eight) are located.
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http://dx.doi.org/10.1107/S205698901700740XDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5458317PMC
June 2017

Crystal structures of two alkaline earth ( = Ba and Sr) dimanganese(II) iron(III) tris-(orthophosphates).

Acta Crystallogr E Crystallogr Commun 2017 May 28;73(Pt 5):767-770. Epub 2017 Apr 28.

Laboratoire de Chimie du Solide Appliquée, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

Two new orthophosphates, BaMnFe(PO) [barium dimanganese(II) iron(III) tris-(orthophosphate)] and SrMnFe(PO) [strontium dimanganese(II) iron(III) tris-(orthophosphate)], were synthesized by solid-state reactions. They are isotypic and crystallize in the ortho-rhom-bic system with space group type . Their crystal structures comprise infinite zigzag chains of edge-sharing FeO octa-hedra (point group symmetry .2.) and MnO double octa-hedra running parallel to [001], linked by two types of PO tetra-hedra. The so-formed three-dimensional framework delineates channels running along [001], in which the alkaline earth cations (site symmetry .2.) are located within a neighbourhood of eight O atoms.
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http://dx.doi.org/10.1107/S2056989017006120DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5418802PMC
May 2017

Synthesis and crystal structure of calcium dizinc iron(III) tris-(orthophosphate), CaZnFe(PO).

Acta Crystallogr E Crystallogr Commun 2016 Sep 5;72(Pt 9):1260-1262. Epub 2016 Aug 5.

Laboratoire de Chimie du Solide Appliquée, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

Single crystals of the title compound, CaZnFe(PO), were synthesized by conventional solid-state reaction. In the asymmetric unit, all atoms are located in fully occupied general positions of the 2/ space group. The zinc atoms are located on two crystallographically independent sites with tetra-hedral and distorted triangular-based bipyramidal geometries. Two edge-sharing triangular bipyramidal ZnO units form a dimer, which is linked to slightly deformed FeO octa-hedra a common edge. The resulting chains are inter-connected through PO tetra-hedra to form a layer perpendicular to the axis. Moreover, the remaining PO and ZnO tetra-hedra are linked together through common vertices to form tapes parallel to the axis and surrounding a chain of Ca cations to build a sheet, also perpendicular to the axis. The stacking of the two layers along the axis leads to the resulting three-dimensional framework, which defines channels in which the Ca cations are located, each cation being coordinated by seven oxygen atoms.
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http://dx.doi.org/10.1107/S2056989016012421DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5120702PMC
September 2016

The alluaudite-type crystal structures of Na2(Fe/Co)2Co(VO4)3 and Ag2(Fe/Co)2Co(VO4)3.

Acta Crystallogr E Crystallogr Commun 2016 Jul 24;72(Pt 7):1017-20. Epub 2016 Jun 24.

Laboratoire de Chimie du Solide Appliquée, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

Single crystals of the title compounds, disodium di(cobalt/iron) cobalt tris-(orthovanadate), Na2(Fe/Co)2Co(VO4)3, and disilver di(cobalt/iron) cobalt tris-(orthovanadate), Ag2(Fe/Co)2Co(VO4)3, were grown from a melt consisting of stoichiometric mixtures of three metallic cation precursors and vanadium pentoxide. The difficulty to distinguish between cobalt and iron by using X-ray diffraction alone forced us to explore several models, assuming an oxidation state of +II for Co and +III for Fe and a partial cationic disorder in the Wyckoff site 8f containing a mixture of Co and Fe with a statistical distribution for the Na compound and an occupancy ratio of 0.4875:0.5125 (Co:Fe) for the Ag compound. The alluaudite-type structure is made up from [10-1] chains of [(Co,Fe)2O10] double octa-hedra linked by highly distorted [CoO6] octa-hedra via a common edge. The chains are linked through VO4 tetra-hedra, forming polyhedral sheets perpendicular to [010]. The stacking of the sheets defines two types of channels parallel to [001] where the Na(+) cations (both with full occupancy) or Ag(+) cations (one with occupancy 0.97) are located.
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http://dx.doi.org/10.1107/S2056989016009981DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4992929PMC
July 2016

Crystal structure of bis-[2,5-bis-(pyridin-2-yl)-1,3,4-thia-diazole-κ(2) N (2),N (3)]bis-(thio-cyanato-κS)copper(II).

Acta Crystallogr E Crystallogr Commun 2016 Aug 22;72(Pt 8):1176-8. Epub 2016 Jul 22.

Laboratoire de Chimie du Solide Appliquée, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

The mononuclear title complex, [Cu(SCN)2(C12H8N4S)2], was obtained by the reaction of 2,5-bis-(pyridin-2-yl)-1,3,4-thia-diazole and potassium thio-cyanate with copper(II) chloride dihydrate. The copper cation lies on an inversion centre and displays an elongated octa-hedral coordination geometry. The equatorial positions are occupied by the N atoms of two 2,5-bis-(pyridin-2-yl)-1,3,4-thia-diazole ligands, whereas the axial positions are occupied by the S atoms of two thio-cyanate anions. The thia-diazole and the pyridyl rings linked to the metal are approximately coplanar, with a maximum deviation from the mean plane of 0.190 (2) Å. The cohesion of the crystal structure is ensured by weak C-H⋯N hydrogen bonds and π-π inter-actions between parallel pyridyl rings of neighbouring mol-ecules [centroid-to-centroid distance = 3.663 (2) Å], leading to a three-dimensional network.
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http://dx.doi.org/10.1107/S2056989016011713DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4971866PMC
August 2016

Crystal structure of strontium dicobalt iron(III) tris-(orthophosphate): SrCo2Fe(PO4)3.

Acta Crystallogr E Crystallogr Commun 2016 Aug 19;72(Pt 8):1143-6. Epub 2016 Jul 19.

Laboratoire de Chimie du Solide Appliquée, Faculty of Sciences, Mohammed V University in Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

The title compound, SrCo2Fe(PO4)3, has been synthesized by a solid-state reaction. It crystallizes with the α-CrPO4 type structure. In this structure, all atoms are on special positions of the Imma space group, except for two O atoms which are located on general positions. The three-dimensional network in the crystal structure is made up of two types of layers stacked normal to (100). The first layer is built from two edge-sharing CoO6 octa-hedra, leading to the formation of Co2O10 dimers that are connected to two PO4 tetra-hedra by a common edge and corners. The second layer results from apex-sharing FeO6 octa-hedra and PO4 tetra-hedra, which form linear chains alternating with a zigzag chain of Sr(II) cations. These layers are linked together by common vertices of PO4 tetra-hedra and FeO6 octa-hedra to form an open three-dimensional framework that delimits two types of channels parallel to [100] and [010] where the Sr(II) cations are located. Each Sr(II) cation is surrounded by eight O atoms.
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http://dx.doi.org/10.1107/S2056989016011373DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4971858PMC
August 2016

Crystal structure of (Na0.70)(Na0.70,Mn0.30)(Fe(3+),Fe(2+))2Fe(2+)(VO4)3, a sodium-, iron- and manganese-based vanadate with the alluaudite-type structure.

Acta Crystallogr E Crystallogr Commun 2016 Feb 23;72(Pt 2):220-2. Epub 2016 Jan 23.

Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V de Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

The title compound, sodium (sodium,manganese) triiron(II,III) tris[vana-date(V)], (Na0.70)(Na0.70,Mn0.30)(Fe(3+),Fe(2+))2Fe(2+)(VO4)3, was prepared by solid-state reactions. It crystallizes in an alluaudite-like structure, characterized by a partial cationic disorder. In the structure, four of the 12 sites in the asymmetric unit are located on special positions, three on a twofold rotation axis (Wyckoff position 4e) and one on an inversion centre (4b). Two sites on the twofold rotation axis are entirely filled by Fe(2+) and V(5+), whereas the third site has a partial occupancy of 70% by Na(+). The site on the inversion centre is occupied by Na(+) and Mn(2+) cations in a 0.7:0.3 ratio. The remaining Fe(2+) and Fe(3+) atoms are statistically distributed on a general position. The three-dimensional framework of this structure is made up of kinked chains of edge-sharing [FeO6] octa-hedra stacked parallel to [10-1]. These chains are held together by VO4 tetra-hedral groups, forming polyhedral sheets perpendicular to [010]. Within this framework, two types of channels extending along [001] are present. One is occupied by (Na(+)/Mn(2+)) while the second is partially occupied by Na(+). The mixed site containing (Na(+)/Mn(2+)) has an octa-hedral coordination sphere, while the Na(+) cations in the second channel are coordinated by eight O atoms.
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http://dx.doi.org/10.1107/S2056989016000931DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4770949PMC
February 2016

Crystal structure of 4-(4-meth-oxy-phen-yl)-4',4'-dimethyl-3-p-tolyl-3',4'-di-hydro-1'H,3H-spiro-[isoxazole-5,2'-naphthalen]-1'-one.

Acta Crystallogr E Crystallogr Commun 2015 Dec 21;71(Pt 12):o981. Epub 2015 Nov 21.

Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V de Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

In the title compound, C28H27NO3, the cyclo-hexa-none and isoxazole rings have envelope conformations, with the methyl-ene and spiro C atoms as the flaps, respectively. The mean plane of the isoxazole ring is inclined slightly to the p-tolyl ring, making a dihedral angle of 14.20 (9)°, and is nearly perpendicular to the mean plane through the tetra-lone moiety and to the meth-oxy-phenyl ring [dihedral angles = 83.41 (8) and 72.12 (9)°, respectively]. The crystal packing is stabilized mainly by van der Waals forces.
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http://dx.doi.org/10.1107/S2056989015022033DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4719934PMC
December 2015

Crystal structure of 2-(4-meth-oxy-phen-yl)-6-nitro-imidazo[1,2-a]pyridine-3-carbaldehyde.

Acta Crystallogr E Crystallogr Commun 2015 Dec 21;71(Pt 12):o979-80. Epub 2015 Nov 21.

Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

In the title compound, C15H11N3O4, the imidazo[1,2-a] pyridine ring system is almost planar [r.m.s. deviation = 0.028 (2) Å]. Its mean plane makes dihedral angles of 33.92 (7) and 34.56 (6)° with the meth-oxy-phenyl ring and the nitro group, respectively. The cohesion of the crystal structure is ensured by C-H⋯N and C-H⋯O hydrogen bonds, forming layers almost parallel to the ac plane.
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http://dx.doi.org/10.1107/S2056989015021957DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4719933PMC
December 2015

Crystal structure of 1-[(2,2-dimethyl-1,3-dioxolan-4-yl)meth-yl]-2-(thia-zol-4-yl)-1H-benzimidazole.

Acta Crystallogr E Crystallogr Commun 2015 Dec 18;71(Pt 12):o951-2. Epub 2015 Nov 18.

Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V de Rabat, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

The benzimidazole ring in the title compound, C16H17N3O2S, is almost planar, with the greatest deviation from the mean plane being 0.032 (1) Å. The fused-ring system makes dihedral angles of 19.91 (7) and 24.51 (8)° with the best plane through each of the thia-zol-4-yl and 1,3-dioxolan-4-yl rings, respectively; the latter exhibits an envelope conformation with the methyl-ene C atom being the flap. Finally, the thia-zol-4-yl ring makes a dihedral angle of 33.85 (9)° with the 1,3-dioxolan-4-yl ring. In the crystal, mol-ecules are connected by a pair of C-H⋯π(imidazole) inter-actions to form centrosymmetric aggregates.
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http://dx.doi.org/10.1107/S205698901502085XDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4719918PMC
December 2015

Crystal structure of N-(1-acetyl-3-chloro-1H-indazol-6-yl)-4-meth-oxy-benzene-sulfonamide.

Acta Crystallogr E Crystallogr Commun 2015 Dec 4;71(Pt 12):o914-5. Epub 2015 Nov 4.

Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

In the title compound, C16H14ClN3O4S, the six-membered ring of the indazole group is connected to a sulfonamide group. The indazole system is essentially planar, with the greatest deviation from the mean plane being 0.007 (2) Å. The dihedral angle between the two six-membered rings is 74.99 (9)°. The crystal structure exhibits inversion dimers in which mol-ecules are linked by pairs of N-H⋯O and C-H⋯O hydrogen bonds.
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http://dx.doi.org/10.1107/S2056989015020605DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4719877PMC
December 2015

Crystal structure of (Z)-3-allyl-5-(4-methyl-benzyl-idene)-2-sulfanyl-idene-1,3-thia-zolidin-4-one.

Acta Crystallogr E Crystallogr Commun 2015 Dec 4;71(Pt 12):o906-7. Epub 2015 Nov 4.

Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.

In the title compound, C14H13NOS2, the atoms of the allyl group are disordered over two sets of sites, with an occupancy ratio of 0.559 (10):0.441 (10). The rhodanine ring makes a dihedral angle of 5.51 (12)° with the mean plane through the p-tolyl group. There are no specific inter-molecular inter-actions in the crystal packing.
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http://dx.doi.org/10.1107/S2056989015020460DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4719873PMC
December 2015
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