1,045 results match your criteria bdes

Uptake and translocation of polybrominated diphenyl ethers in the rhizosphere soil-crop-atmosphere system in e-waste dismantling areas in Taizhou, China.

Chemosphere 2021 Apr 28;280:130586. Epub 2021 Apr 28.

School of Environment and Natural Resources, Renmin University of China, Beijing, 100872, PR China. Electronic address:

Air, crop, and rhizosphere soil samples were collected from e-waste dismantling areas in Taizhou City (Zhejiang Province, China). The mean PBDEs (Polybrominated diphenyl ethers) concentrations in air in the Fengjiang and Binhai areas were 27.8 and 25. Read More

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Atmospheric deposition of semivolatile organic pollutants in European high mountains: Sources, settling and chemical degradation.

Sci Total Environ 2021 Apr 14;784:147099. Epub 2021 Apr 14.

Institute of Environmental Assessment and Water Research, (IDAEA-CSIC), Jordi Girona, 18. 08034 Barcelona, Catalonia, Spain.

Bulk atmospheric deposition samples, including wet and dry deposition, were collected during 2004-2006 in four high mountain European lakes: Skalnate Pleso (Tatra mountains, Slovakia), Gossenköllesee (Alps, Austria), Redon (Pyrenees, Spain), and Lochnagar (Grampian Mountains, Scotland). Samples were analysed for polycyclic aromatic hydrocarbons (PAHs), polychlorobiphenyls (PCBs), hexachlorobenzene (HCB), hexachlorocyclohexanes (HCHs), endosulfans, and polybromodiphenyl ethers (PBDEs). The deposition of PCBs, HCHs, and low brominated BDEs reflected baseline contributions from long range atmospheric transport. Read More

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Spatial Distribution, Bioconversion and Ecological Risk of PCBs and PBDEs in the Surface Sediment of Contaminated Urban Rivers: A Nationwide Study in China.

Environ Sci Technol 2021 Apr 14. Epub 2021 Apr 14.

Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-Sen University, Guangzhou 510006, China.

Surface sediments of polluted urban rivers can be a reservoir of hydrophobic persistent organic pollutants (POPs). In this study, we comprehensively assessed the contamination of two groups of POPs, that is, polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs), in 173 black-odorous urban rivers in China. Spatial distribution of PCBs and PBDEs showed similar patterns but very different contamination levels in surface sediments, that is, average concentrations of 10. Read More

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A New BODIPY Material for Pure Color and Long Lifetime Red Hyperfluorescence Organic Light-Emitting Diode.

ACS Appl Mater Interfaces 2021 Apr 7;13(15):17882-17891. Epub 2021 Apr 7.

Organic Optoelectronic Device Laboratory, Department of Information Display, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul, 02447, Republic of Korea.

A red fluorescent material, 1,3,7,9-tetrakis(4-(-butyl)phenyl)-5,5-difluoro-10-(2-methoxyphenyl)-5-4l4,5l4-dipyrrolo[1,2-:2',1'-][1,3,2]diazaborinine (4tBuMB), as an emitting dopant in a thermally activated delayed fluorescence (TADF) sensitized hyperfluorescence organic light-emitting diode (HFOLED) is reported. The 4tBuMB shows a high photoluminescence quantum yield (PLQY) of 99% with an emission maximum at 620 nm and a full width at half-maximum (fwhm) of 31 nm in solution. Further, it shows a deep lowest unoccupied molecular orbital (LUMO) of 3. Read More

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Bond dissociation energies of lanthanide sulfides and selenides.

J Chem Phys 2021 Mar;154(12):124307

Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.

Resonant two-photon ionization spectroscopy has been employed to observe sharp predissociation thresholds in the spectra of the lanthanide sulfides and selenides for the 4f metals Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Lu. As these molecules possess a large density of electronic states near the ground separated atom limit, these predissociation thresholds are argued to coincide with the true 0 K bond dissociation energies (BDEs). This is because spin-orbit and nonadiabatic couplings among these states allow the molecules to predissociate rapidly when the BDE is reached or exceeded. Read More

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Thermochemistry of the Ir + SO reaction using guided ion beam tandem mass spectrometry and theory.

J Chem Phys 2021 Mar;154(12):124302

Department of Chemistry, University of Utah, 315 S 1400 E Rm 2020, Salt Lake City, Utah 84112, USA.

Kinetic energy dependences of the reactions of Ir (F) with SO were studied using a guided ion beam tandem mass spectrometer and theory. The observed cationic products are IrO, IrS, and IrSO, formed in endothermic reactions. Bond dissociation energies (BDEs) of the products are determined by modeling the kinetic energy dependent product cross sections: D(Ir-O) = 4. Read More

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Determination of Polybrominated Diphenyl Ethers in Water Samples Using Effervescent-Assisted Dispersive Liquid-Liquid Icroextraction with Solidification of the Aqueous Phase.

Molecules 2021 Mar 4;26(5). Epub 2021 Mar 4.

Institute for Agro-food Standards and Testing Technology, Shanghai Academy of Agricultural Science, Shanghai 201403, China.

An effective and sensitive method is necessary for the determination of polybrominated diphenyl ethers (PBDEs) pollutants in water. In this study, effervescent-assisted dispersive liquid-liquid microextraction with solidification of the aqueous phase (EA-DLLME-SAP), followed by Gas Chromatography-Tandem Mass Spectrometry (GC-MS-MS) quantitative analysis, was established for the preconcentration and determination of PBDEs in real environmental water samples. 1,1,2,2-Tetrachloroethane was used as the extractant and directly dispersed into the water phase of the aqueous samples with the aid of a large number of carbon dioxide bubbles generated via the acid-base reaction of acetic acid and sodium bicarbonate, which did not require the use of a dispersant during the extraction process. Read More

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Identification of new biologically active synthetic molecules: comparative experimental and theoretical studies on the structure-antioxidant activity relationship of cyclic 1,3-ketoamides.

J Mol Model 2021 Mar 19;27(4):109. Epub 2021 Mar 19.

Laboratoire de Chimie Fine LCF, Université Oran 1 Ahmed Ben Bella, BP-1524-Menouar, 31000, Oran, Algeria.

Antioxidant agent is a chemical that prevents the oxidation of other chemical substances. Its use is the most effective means of protecting the organism by neutralizing the harmful effects of free radicals caused by oxidative stress. In the present work, a series of β-ketoamides containing a variety of monosubstituted amide groups were synthesized and tested as antioxidant agents. Read More

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Bond dissociation energies of diatomic transition metal sulfides: ScS, YS, TiS, ZrS, HfS, NbS, and TaS.

J Chem Phys 2020 May;152(19):194307

Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.

The early transition metal diatomic sulfides, MS, M = Sc, Y, Ti, Zr, Hf, Nb, and Ta, have been investigated using resonant two-photon ionization spectroscopy in the vicinity of their bond dissociation energies (BDEs). Due to the high density of vibronic states in this energy range, the molecular spectra appear quasicontinuous, and when the excitation energy exceeds the ground separated atom limit, excited state decay by dissociation becomes possible. The dissociation process typically occurs so rapidly that the molecule falls apart before a second photon can be absorbed to ionize the species, leading to a sharp drop in ion signal, which is identified as the 0 K BDE. Read More

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Bond Dissociation Energies in Heavy Element Chalcogen and Halogen Small Molecules.

J Phys Chem A 2021 Mar 1;125(9):1892-1902. Epub 2021 Mar 1.

Department of Chemistry and Biochemistry, University of Alabama, Tuscaloosa, Alabama 35401, United States.

Thermodynamic properties including bond dissociation energies (BDEs), heats of formation, and gas-phase acidities for the hydrides and dimers of chalcogens and halogens, HY, HX, Y, and X for Y = Se, Te, and At and X = Br, I, and At, have been predicted using the Feller-Peterson-Dixon composite-correlated molecular orbital theory approach. A full four-component CCSD(T) approach was used to calculate the spin-orbit effects on thermodynamic properties, except for Se, where the AoC-DHF value was used due to strong multireference effects in Se for the SO calculations. The calculated results show that the At BDE is quite small, 19. Read More

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Molecular design of energetic tetrazine-triazole derivatives.

J Mol Model 2021 Feb 28;27(3):98. Epub 2021 Feb 28.

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Nitrogen-rich compounds are promising candidates for preparing high energetic density materials (HEDMs) and show the potential in the application of propellants, explosives, and pyrotechnics. Two kinds of typical nitrogen-rich compounds, such as tetrazine and triazole, have attracted the attentions in recent years owing to their high densities, good thermal stabilities, and excellent energetic performances. In this work, four series of innovative energetic compounds based on the conjugates of tetrazine and triazole bearing various substituents (-NH, -NO, and -NHNO) were designed. Read More

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February 2021

Modeling Gas-Phase Unimolecular Dissociation for Bond Dissociation Energies: Comparison of Statistical Rate Models within RRKM Theory.

J Phys Chem A 2021 Mar 26;125(9):1927-1940. Epub 2021 Feb 26.

Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.

The Rice-Ramsperger-Kassel-Marcus (RRKM) theory provides a simple yet powerful rate theory for calculating microcanonical rate constants. In particular, it has found widespread use in combination with gas-phase kinetic experiments of unimolecular dissociations to extract experimental bond dissociation energies (BDEs). We have previously found several discrepancies between the computed BDE values and the respective experimental ones, obtained with our empirical rate model, named L-CID. Read More

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Lateral Modified Brandt-Daroff Exercises: A Novel Home Treatment Technique for Horizontal Canal BPPV.

J Int Adv Otol 2021 Jan;17(1):52-57

Philadelphia College of Osteopathic Medicine, Philadelphia, PA, USA.

Objectives: Brandt-Daroff exercises (BDEs) are commonly used as an at-home treatment for posterior canalithiasis, but their efficacy in the treatment of benign paroxysmal positional vertigo (BPPV) of the horizontal canal (HC-BPPV) has not been previously studied. Using biomechanical model simulation, we investigated modifications that may optimize BDE use for HC-BPPV treatment.

Materials And Methods: The BPPV Viewer, a three-dimensional model of the human labyrinth, was used to analyze BDE for HC-BPPV treatment. Read More

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January 2021

Theoretical prediction of the trigger linkage, cage strain, and explosive sensitivity of CL-20 in the external electric fields.

J Mol Model 2021 Feb 17;27(3):85. Epub 2021 Feb 17.

School of Equipment Engineering, Shenyang Ligong University, Shenyang, 110159, China.

In order to add safely external electric fields into the systems of the explosives with strong cage strain, the effects of the external electric fields on the strengths of trigger linkages, cage strain energies (CSEs), surface electrostatic potentials (ESPs), as well as impact and shock initiation sensitivities of CL-20 were investigated using the B3LYP and M06-2X methods with 6-311++G(2d,p) basis set. The results show that the changes of the strengths of the N-NO bonds are more notable than those of the bonds forming cage, and the changes involving the N-NO bonds attached to the five-membered ring are more significant than those attached to the six-membered ring. In most cases, the CSEs in the electric fields are stronger than those in no field. Read More

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February 2021

Surprising Homolytic Gas Phase Co-C Bond Dissociation Energies of Organometallic Aryl-Cobinamides Reveal Notable Non-Bonded Intramolecular Interactions.

Chemistry 2021 May 25;27(25):7252-7264. Epub 2021 Mar 25.

Laboratorium für Organische Chemie, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland.

Aryl-cobalamins are a new class of organometallic structural mimics of vitamin B designed as potential 'antivitamins B '. Here, the first cationic aryl-cobinamides are described, which were synthesized using the newly developed diaryl-iodonium method. The aryl-cobinamides were obtained as pairs of organometallic coordination isomers, the stereo-structure of which was unambiguously assigned based on homo- and heteronuclear NMR spectra. Read More

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Evaluation of the Pr + O → PrO + e chemi-ionization reaction enthalpy and praseodymium oxide, carbide, dioxide, and carbonyl cation bond energies.

Phys Chem Chem Phys 2021 Feb;23(4):2938-2952

Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.

Guided ion beam tandem mass spectrometry (GIBMS) was used to measure the kinetic energy dependent product ion cross sections for reactions of the lanthanide metal praseodymium cation (Pr+) with O2, CO2, and CO and reactions of PrO+ with CO, O2, and Xe. PrO+ is formed through barrierless exothermic processes when the atomic metal cation reacts with O2 and CO2, whereas all other reactions are observed to be endothermic. Analyses of the kinetic energy dependences of these cross sections yield 0 K bond dissociation energies (BDEs) for PrO+, PrC+, PrCO+, and PrO2+. Read More

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February 2021

Thermochemistry of Tungsten-3p Elements for Density Functional Theory, !

J Phys Chem A 2021 Jan 6;125(2):681-690. Epub 2021 Jan 6.

Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, 1155 Union Circle, #305070, Denton, Texas 76203-5017, United States.

There are two primary foci in this research on WE (E = Si, P, and S) bonds: prediction of their bond dissociation enthalpies (BDEs), including σ- and π-bond energy components, and assessing the uncertainty of these BDE predictions for levels of theory commonly used in the literature. The internal standards for computational accuracy include metal-element bond lengths (mean absolute error = 1.8 ± 1. Read More

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January 2021

Benchmarking Antioxidant-Related Properties for Gallic Acid through the Use of DFT, MP2, CCSD, and CCSD(T) Approaches.

J Phys Chem A 2021 Jan 5;125(1):198-208. Epub 2021 Jan 5.

Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.

We present a benchmark investigation on the O-H bond dissociation enthalpies (BDEs) and ionization potential (IP) for gallic acid (GA), a widely known polyphenolic antioxidant. These properties were determined in the gas-phase and in water through the use of density functional theory (DFT), second-order Møller-Plesset perturbation theory (MP2), coupled-cluster with single and double excitations (CCSD), and coupled-cluster with single and double excitations as well as perturbative inclusion of triples (CCSD(T)). The 6-311++G(df,p), cc-pVDZ, aug-cc-pVDZ, cc-pVTZ, and aug-cc-pVTZ basis sets were used. Read More

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January 2021

A comparison of developmental toxicity of brominated and halogen-free flame retardant on zebrafish.

Ecotoxicol Environ Saf 2021 Jan 10;208:111745. Epub 2020 Dec 10.

Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil. Electronic address:

Brominated diphenyl ethers (BDEs) are halogenated flame retardants. Several concerns related to persistence and toxicity of BDEs have been resulted in a growing need of BDEs replacement. The use of halogen-free flame retardants (HFFR) has increased as a safer alternative, but little information is available on their toxic potential for environmental health and for developing organisms. Read More

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January 2021

Polybrominated diphenyl ethers in serum from residents living in a brominated flame retardant production area: Occurrence, influencing factors, and relationships with thyroid and liver function.

Environ Pollut 2021 Feb 11;270:116046. Epub 2020 Dec 11.

School of Public Health and Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing, 100069, China. Electronic address:

Polybrominated diphenyl ethers (PBDEs) have been used as flame retardants (FRs) in China for decades, even after they were identified as persistent organic pollutants. In this study, serum samples were collected from 172 adults without occupational exposure who were residents of a well-known FR production region (Laizhou Bay, north China), and PBDE congeners were measured to assess their occurrence, congener profile and influencing factors in serum. Moreover, the relationships between serum concentrations of PBDEs and thyroid/liver function indicators were analyzed to evaluate whether human exposure to PBDEs would lead to thyroid/liver injury. Read More

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February 2021

Investigating the molecular mechanism of hydroxylated bromdiphenyl ethers to inhibit the thyroid hormone sulfotransferase SULT1A1.

Chemosphere 2021 Jan 16;263:128353. Epub 2020 Sep 16.

College of Geography and Environmental Sciences, Zhejiang Normal University, Yingbin Avenue 688, Jinhua, 321004, China. Electronic address:

Hydroxylated bromodiphenyl ethers (OH-BDEs) have raised great concern due to their potential endocrine disrupting effects on humans. In vitro experiments have indicated OH-BDEs can inhibit the activity of thyroid hormone (TH) sulfotransferases (SULTs); however, the molecular mechanism has not been investigated in depth. In this work, we employed 17 OH-BDEs with five or fewer Br atoms, and performed integrated computational simulations to unravel the possible inhibition mechanism of OH-BDEs on human SULT1A1. Read More

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January 2021

Leveraging Blockchain Technology for Secure Energy Trading and Least-Cost Evaluation of Decentralized Contributions to Electrification in Sub-Saharan Africa.

Entropy (Basel) 2020 Feb 17;22(2). Epub 2020 Feb 17.

Department of Computer Science, COMSATS University Islamabad, Islamabad 44000, Pakistan.

The International Energy Agency has projected that the total energy demand for electricity in sub-Saharan Africa (SSA) is expected to rise by an average of 4% per year up to 2040. It implies that ~620 million people are living without electricity in SSA. Going with the 2030 vision of the United Nations that electricity should be accessible to all, it is important that new technology and methods are provided. Read More

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February 2020

Sediment Records of Polybrominated Diphenyl Ethers (PBDEs) from the Anhui Province Section of Yangtze River, China.

Bull Environ Contam Toxicol 2021 Feb 26;106(2):334-341. Epub 2020 Nov 26.

School of Biology, Food and Environment, Hefei University, Hefei, 230022, Anhui Province, China.

This study investigated the temporal changes of PBDEs in the sediment cores from the Anhui Province section of Yangtze River (YR), China. The dramatic increase of ∑Br-Br-BDEs and BDE-209 concentrations in cores in the period of ca. 1990-2008 was consistent with the booming of regional and national production and consumption of household appliances and electronics. Read More

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February 2021

Gas-Phase Binding Energies and Dissociation Dynamics of 1-Alkyl-3-Methylimidazolium Tetrafluoroborate Ionic Liquid Clusters.

J Phys Chem A 2020 Dec 24;124(49):10181-10198. Epub 2020 Nov 24.

Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.

Ionic liquids (ILs) have become increasingly popular due to their useful and unique properties, yet there are still many unanswered questions regarding their fundamental interactions. In particular, details regarding the nature and strength of the intrinsic cation-anion interactions and how they influence the macroscopic properties of ILs are still largely unknown. Elucidating the molecular-level details of these interactions is essential to the development of better models for describing ILs and enabling the purposeful design of ILs with properties tailored for specific applications. Read More

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December 2020

Absolute Trends and Accurate and Precise Gas-Phase Binding Energies of 1-Alkyl-3-Methylimidazolium Tetrafluoroborate Ionic Liquid Clusters from Combined Independent and Competitive TCID Measurements.

H A Roy M T Rodgers

J Phys Chem A 2020 Dec 24;124(49):10199-10215. Epub 2020 Nov 24.

Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.

Ionic liquid (IL) development efforts have focused on achieving desired properties via tuning of the IL through variation of the cations and anions. However, works geared toward a microscopic understanding of the nature and strength of the intrinsic cation-anion interactions of ILs have been rather limited such that the intrinsic strength of the cation-anion interactions in ILs is largely unknown. In previous work, we employed threshold collision-induced dissociation approaches supported and enhanced by electronic structure calculations to characterize the nature of the cation-anion interactions in and determine the bond dissociation energies (BDEs) of a series of four 2:1 clusters of 1-alkyl-3-methylimidazolium cations and tetrafluoroborate anions, [2Cmim:BF]. Read More

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December 2020

Spatial distribution, source identification, and anthropogenic effects of brominated flame retardants in nationwide soil collected from South Korea.

Environ Pollut 2021 Mar 9;272:116026. Epub 2020 Nov 9.

Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea; UNIST Environmental Analysis Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea. Electronic address:

Soil samples were collected at 61 sites of the national monitoring network for persistent organic pollutants (POPs) in South Korea. The target compounds were brominated flame retardants (BFRs), including polybrominated diphenyl ethers (PBDEs), polybrominated biphenyls (PBBs), hexabromocyclododecanes (HBCDDs), and tetrabromobisphenol A (TBBPA). The mean concentrations of Σ PBDEs, Σ HBCDDs, and TBBPA in soil were 222, 17. Read More

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Observable carbon isotope fractionation in the photodegradation of polybrominated diphenyl ethers by simulated sunlight.

Chemosphere 2021 Mar 13;266:128950. Epub 2020 Nov 13.

State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, People's Republic of China; Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, People's Republic of China.

In the present study, carbon isotope effects were investigated during the photodegradation of polybrominated diphenyl ethers (PBDEs) by compound-specific stable isotope analysis (CSIA). Five PBDE congeners (BDE 85, 99, 100, 153 and 154) in n-hexane were individually exposed to simulated sunlight for as long as 15 h, except for BDE 100 (24 h). Consecutive debromination of PBDE by photolysis in n-hexane was confirmed by the clear C enrichment of mother congeners and successive depletion of δC values for the photodegradation products with decreasing degree of bromination, which can be attributed to mass-dependent isotope fractionation. Read More

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C-H Activation by an Iron-Nitrido Bis-Pocket Porphyrin Species.

Angew Chem Int Ed Engl 2021 02 4;60(9):4796-4803. Epub 2021 Jan 4.

State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China.

High-valent iron-nitrido species are nitrogen analogues of iron-oxo species which are versatile reagents for C-H oxidation. Nonetheless, C-H activation by iron-nitrido species has been scarcely explored, as this is often hampered by their instability and short lifetime in solutions. Herein, the hydrogen atom transfer (HAT) reactivity of an Fe porphyrin nitrido species (2 c) toward C-H substrates was studied in solutions at room temperature, which was achieved by nanosecond laser flash photolysis (LFP) of its Fe -azido precursor (1 c) supported by a bulky bis-pocket porphyrin ligand. Read More

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February 2021

Persistent organic pollutants (POPs) in fish species from different lakes of the lesser Himalayan region (LHR), Pakistan: The influence of proximal sources in distribution of POPs.

Sci Total Environ 2021 Mar 29;760:143351. Epub 2020 Oct 29.

Environmental Biology and Ecotoxicology Laboratory, Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, PO 45320, Islamabad, Pakistan. Electronic address:

Fish dwelling in remote mountain water systems are sensitive to long term exposure of POPs and can be used as an important bioindicator of POPs pollution in fragile mountain ecosystems. Current study aimed to investigate the concentrations and patterns of organic pollutants in fish tissues from different lakes of the Lesser Himalayan Region (LHR). OCPs, PCBs, PBDEs were analyzed in four common edible fish species of the LHR: Oncorhynchus mykiss, Labeo rohita, Hypophthalmichthys molitrix and Orechromis aureus. Read More

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Trends of Diverse POPs in Air and Water Across the Western Atlantic Ocean: Strong Gradients in the Ocean but Not in the Air.

Environ Sci Technol 2020 Nov 5. Epub 2020 Nov 5.

Harvard John A. Paulson School of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138, United States.

Oceans have remained the least well-researched reservoirs of persistent organic pollutants (POPs) globally, due to their vast scale, difficulty of access, and challenging (trace) analysis. Little data on POPs exists along South America and the effect of different currents and river plumes on aqueous concentrations. Research cruise KN210-04 () offered a unique opportunity to determine POP gradients in air, water, and their air-water exchange along South America, covering both hemispheres. Read More

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November 2020