structure structure (solids and liquids) D 2000
-003Crystal Structure and Raman Spectroscopy of FeVMoO 7 and CrVMoO 7 with Mo=O Double Bonds.-Single crystals of the title compounds are grown by a flux method from Fe 2 O 3 -V 2 O 5 -MoO 3 and Cr 2 O 3 -V 2 O 5 -MoO 3 melts. Both compounds crystallize in the triclinic space group P1 with Z = 2. FeVMoO 7 and CrVMoO 7 are isostructural, in which V 5+ and Mo 6+ ions in the [VMoO 7 ] 3− units are crystallographically distinct, and one type of oxygen is bonded only to molybdenum, forming a Mo=O double bond. These rare structural features are also studied by infrared and Raman spectroscopy. -(WANG, X.; HEIER, K. R.; STERN, C. L.; POEPPELMEIER, K. R.; Inorg. Chem. 37 (1998) 13, 3252-3256; Dep. Chem., Northwest. Univ., Evanston, IL 60208, USA; EN)
Water oxidation reaction (WOR) is a rather sluggish process in the water splitting that hampers the extraction of hydrogen gas from water in a large scale. It is highly desirable to develop low‐cost WOR catalysts to increase the efficacy. Herein two Cu(II) complexes [Cu (DTEL)2]n(ClO4)2n (1) and [Cu(DTE)2(ClO4)2] (2) of two triazolylpyridines, 1‐(2‐hydroxy)‐4‐(2‐pyridyl)1,2,3‐triazole (DTEL) and 1‐(2‐acetoxymethyl)‐4‐(2‐pyridyl)1,2,3‐triazole (DTE), have been synthesized and characterized. The X‐ray diffraction analysis revealed that the copper centers of 1 and 2 adopted the octahedral coordination geometry with four N atoms from two DTEL or DTE ligands in the equatorial plane. The two axial sites were weakly ligated by the hydroxyl group of DTEL or perchlorate. Both complexes 1 and 2 were homogenous molecular catalysts boosting the WOR in pH 9.0 phosphate buffer solution with the overpotentials being 568 and 478 mV, rate constants (kcat) of 0.1 and 0.39 s−1, and Faradaic efficiencies of 90% and 93%, respectively. The pendant substituent on the two triazolylpyridine ligands DTEL and DTE apparently influenced the catalysis. A mechanism for the catalytic WOR mediated by 1 and 2 was suggested on the basis of the experimental data. This work illustrated that triazolylpyridines were promising scaffolds for forming metal complexes working as WOR catalysts.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
structure structure (solids and liquids) D 2000
-025Reduction of Magnesium Orthovanadate Mg 3 (VO 4 ) 2 .-A single crystal of orthorhombic Mg 3 V 2 O 8 (cation-deficient-spinel structure) is transformed into cubic Mg 3 V 2 O 6 (space group Fd-3m, Z = 8) at 560 • C in 7% H 2 /N 2 . Polycrystalline Mg 3 V 2 O 6 can be readily reoxidized to Mg 3 V 2 O 8 in air or oxygen at 500 • C. Single crystal X-ray diffraction analysis shows that Mg 3 V 2 O 6 has a spinel structure with an excess of cations (cation-stuffed-spinel structure). -(WANG, X.; ZHANG, H.; SINKLER, W.; POEPPELMEIER, K. R.; MARKS, L. D.; J. Alloys Compd. 270 (1998) 1-2, 88-94; Dep. Chem., Northwest. Univ., Evanston, IL 60208, USA; EN)
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.