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structure structure (solids and liquids) D 2000 24 -012 Synthesis, Crystal Structures and Optical Properties of New Quaternary Chalcogenides of Va-Metals: Rb 2 CuVS 4 , K 2 CuVSe 4 , Rb 2 CuNbSe 4 , Cs 2 CuNbSe 4 and Rb 2 CuNbS 4 . -The title compounds are prepared at 350 • C as new quaternary one-dimensional chain compounds. They crystallize isostructurally in the orthorhombic space group Fddd with Z = 8 as determined by single crystal XRD. They consist of infinite linear chains of alternating edge-sharing CuQ 4 -and M(V)Q 4 -tetrahedra (Q: S, Se; M(V): V, Nb) separated by the alkali metal cations. The optical band gaps ranging between 1.85 (Rb 2 CuVS 4 ) to 2.82 eV (K 2 CuNbS 4 ) do not depend on the type of alkali cation. In contrast, substitution of Se by S shifts the gap to larger values. -(RUMPF, C.; TILLINSKI, R.; NAETHER, C.; DUERICHEN, P.; JESS, I.; BENSCH, W.; Eur.

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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.

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.