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Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane.
J Environ Sci (China)
January 2025
Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark; Sino-Danish Center for education and research, China and Denmark, Dalgas Avenue 4, DK-8000 Aarhus C., Denmark.
Dibromoethane is a widespread, persistent organic pollutant. Biochars are known mediators of reductive dehalogenation by layered Fe-Fe hydroxides (green rust), which can reduce 1,2-dibromoethane to innocuous bromide and ethylene. However, the critical characteristics that determine mediator functionality are lesser known.
View Article and Find Full Text PDFTransition Metal-Based Dimeric Metallosurfactants: From Organic-Inorganic Hybrid Structures and Low-Dimensional Magnets to Metallomicelles.
Inorg Chem
July 2024
Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička 54 ,Zagreb HR-10000, Croatia.
The dimeric (gemini) as well as metallosurfactants exhibit enhanced physicochemical properties compared with conventional surfactants. By uniting the benefits of both, a series of novel dimeric metallosurfactants of the type (12-2-12)[MBr] (M = Co, Ni, Cu and Zn) was successfully prepared by the reaction of the dimeric surfactant bis(,-dimethyl--dodecyl)ethylene-1,2-diammonium dibromide, 12-2-12, and the MBr salt. Structures and magnetic properties of the materials were studied comprehensively in the solid state, while their micellization was explored in solution.
View Article and Find Full Text PDFMono- and Bis-Phosphine Promoted Incorporation of Boron, Nitrogen, and Phosphorus into Heterocycles via Staudinger Reactions of Borafluorene Azides.
Inorg Chem
June 2024
Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 18-596, Cambridge, Massachusetts 02139-4307, United States.
We report the synthesis and characterization of a series of BNP-incorporated borafluorenate heterocycles formed via thermolysis reactions of pyridylphosphine and bis(phosphine)-coordinated borafluorene azides. The use of diphenyl-2-pyridylphosphine (PyPhP), trans-1,2-bis(diphenylphosphino)ethylene (PhP(H)C═C(H)PPh), and bis(diphenylphosphino)methane (PhPC(H)PPh) as stabilizing ligands resulted in Staudinger reactions to form complex heterocycles with four- (BNP, BNPC, PN) and five-membered (BNPC and BNPC) rings, which were successfully isolated and fully characterized by multinuclear NMR and X-ray crystallography. However, when bis(diphenylphosphino)benzene (PhP-Ph-PPh) was used as the ligand in a reaction with 9-bromo-9-borafluorene (BF-Br), due to the close proximity of the donor P atoms, the diphosphine-stabilized borafluoronium ion with an unusual borafluorene dibromide anion was formed.
View Article and Find Full Text PDFGemini ionic liquid-based surfactants: efficient synthesis, surface activity, and use as inducers for the fabrication of CuO nanoparticles.
RSC Adv
October 2023
Chemistry Department, Faculty of Science, Benha University Benha 13518 Egypt
Discovery of green and novel synthetic routes for nanoparticles (NPs) has drawn a lot of interest due to the distinct nano size and unusual features as well as applications of such particles. Ionic liquid-based surfactants (ILBSs) and gemini ionic liquid-based surfactants (GILBSs) have become some of the best choices to be used as inducers or dispersing agents for the fabrication of nanoparticles. This work involves the synthesis, spectroscopic characterization, and surface property evaluation of three novel GILBSs (4a-c), which incorporate the imidazolium cation as the polar head with an ethylene spacer.
View Article and Find Full Text PDFDual C-Br Isotope Fractionation Indicates Distinct Reductive Dehalogenation Mechanisms of 1,2-Dibromoethane in - and -Containing Cultures.
Environ Sci Technol
February 2023
Grup MAiMA, SGR Mineralogia Aplicada, Geoquímica i Geomicrobiologia, Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Institut de Recerca de l'Aigua (IdRA), Universitat de Barcelona (UB), Martí Franquès s/n, Barcelona08028, Spain.
Brominated organic compounds such as 1,2-dibromoethane (1,2-DBA) are highly toxic groundwater contaminants. Multi-element compound-specific isotope analysis bears the potential to elucidate the biodegradation pathways of 1,2-DBA in the environment, which is crucial information to assess its fate in contaminated sites. This study investigates for the first time dual C-Br isotope fractionation during in vivo biodegradation of 1,2-DBA by two anaerobic enrichment cultures containing organohalide-respiring bacteria (i.
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