Publications by authors named "T Weyhermuller"

236 Publications

Coordination polymers of Ag(i) and Hg(i) ions with 2,2'-azobispyridine: synthesis, characterization and enhancement of conductivity in the presence of Cu(ii) ions.

Dalton Trans 2020 Jul 17;49(25):8438-8442. Epub 2020 Jun 17.

Department of Chemistry, R. K. Mission Residential College, Kolkata 700103, India.

The cationic coordination polymers (CPs) of the types [Hg(abpy)][PF] (1) and [Ag(abpy)][PF] (2) (abpy = 2,2'-azobispyridine) were synthesized and characterized. Experimentation using the crystals confirmed that 1 and 2 are conductors of electricity. The relative conductivity of 1 is 62 times greater than that of 2. The conductivity of 1 increases 70 fold when it reacts with Cu ions.
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http://dx.doi.org/10.1039/d0dt01470bDOI Listing
July 2020

Ruthenium 4d-to-2p X-ray Emission Spectroscopy: A Simultaneous Probe of the Metal and the Bound Ligands.

Inorg Chem 2020 Jun 11;59(12):8272-8283. Epub 2020 May 11.

Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany.

Ruthenium 4d-to-2p X-ray emission spectroscopy (XES) was systematically explored for a series of Ru and Ru species. Complementary density functional theory calculations were utilized to allow for a detailed assignment of the experimental spectra. The studied complexes have a range of different coordination spheres, which allows the influence of the ligand donor/acceptor properties on the spectra to be assessed. Similarly, the contributions of the site symmetry and the oxidation state of the metal were analyzed. Because the 4d-to-2p emission lines are dipole-allowed, the spectral features are intense. Furthermore, in contrast with K- or L-edge X-ray absorption of 4d transition metals, which probe the unoccupied levels, the observed 4p-to-2p XES arises from electrons in filled-ligand- and filled-metal-based orbitals, thus providing simultaneous access to the ligand and metal contributions to bonding. As such, 4d-to-2p XES should be a promising tool for the study of a wide range of 4d transition-metal compounds.
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http://dx.doi.org/10.1021/acs.inorgchem.0c00663DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7298721PMC
June 2020

Controlling the Product Platform of Carbon Dioxide Reduction: Adaptive Catalytic Hydrosilylation of CO Using a Molecular Cobalt(II) Triazine Complex.

Angew Chem Int Ed Engl 2020 Sep 2;59(36):15674-15681. Epub 2020 Jun 2.

Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470, Mülheim an der Ruhr, Germany.

The catalytic reduction of carbon dioxide (CO ) is considered a major pillar of future sustainable energy systems and chemical industries based on renewable energy and raw materials. Typically, catalysts and catalytic systems are transforming CO preferentially or even exclusively to one of the possible reduction levels and are then optimized for this specific product. Here, we report a cobalt-based catalytic system that enables the adaptive and highly selective transformation of carbon dioxide individually to either the formic acid, the formaldehyde, or the methanol level, demonstrating the possibility of molecular control over the desired product platform.
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http://dx.doi.org/10.1002/anie.202004463DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7496264PMC
September 2020

Hydroamination of Aromatic Alkynes to Imines Catalyzed by Pd(II)-Anthraphos Complexes.

ACS Omega 2020 Apr 1;5(15):8912-8918. Epub 2020 Apr 1.

Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany.

Herein, we report the synthesis, characterization, and catalytic performance of cationic Pd(II)-Anthraphos complexes in the intermolecular hydroamination of aromatic alkynes with aromatic amines. The reaction proceeds with 0.18 mol % of catalyst loading, at 90 °C for 4 h under neat conditions. Good to excellent yields could be obtained for a broad range of amines and alkynes.
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http://dx.doi.org/10.1021/acsomega.0c00562DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7178791PMC
April 2020

Metal promoted conversion of aromatic amines to ortho-phenylenediimine derivatives by a radical coupling path.

Dalton Trans 2020 Apr;49(16):5015-5019

Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata-700103, India.

A radical path for the conversion of o-substituted arylamines to o-phenylenediimine derivatives is reported. In the presence of [RuII(PPh3)3Cl2] (RuP), 2-(phenylthio)aniline (LSNH2) acts as an o-amination agent. Reaction of LSNH2 with RuP in toluene promotes (4e + 4H+) oxidative dimerization affording an o-phenylenediimine complex of ruthenium(ii). Similarly, intermolecular coupling between LSNH2 and other arylamines has been achieved.
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http://dx.doi.org/10.1039/d0dt00089bDOI Listing
April 2020