Vanadium chalcogenides

Solid solutions Nb, V Se2 (0 < x < 1) have been prepared by direct synthesis. Single crystals of VSe2 were produced by chemical transport with iodine as transporting agent. ° Lithium has been intercalated into vanadium chalcogenides using n-butyl-lithium in hexane (see also p. 4). ... 

Much of the interest in clusters of this type arises from their structural similarity to the fundamental structural element of the superconducting Chevrel phases M MogEg (M = Pb, Sn, Cu, etc.) and more recently discovered rhenium halco halide phases. Although these solid-state compounds are known only for Mo and Re, molecular MgEgLg clusters of Zr, V, Cr, Mo, W, Re, Fe, and Co have been reported (Table 2). The lone examples of octahedral zirconium- and vanadium-chalcogenide clusters are unique in that they also possess interstitial O and S atoms, respectively. Evidence for interstitial FI atoms in the clusters [Cr6Eg(PEt3)g] (E = S, Se) has been presented. ... 

Table 5.2 Characteristic structural data of vanadium chalcogenide complexes.

Murphy DW (1982) Lithium intercalation compounds of vanadium chalcogenides. In Whittingham MS, Jacobstm AJ (eds) Intercalation chemistry. Academic, New York, pp 563-572... 

Although not yet published in a journal, according to thesis work, the vanadium compounds VSCl (11), VSBr, and VSI (208) seem to exist. Numerous niobium chalcogenide halides have been reported, and among these are the best characterized examples of Group VB (see Table X). Only two tantalum compounds, TaSjCU (361) and TaSCls (13) have thus far been described in the literature. 

Sokolov MN, Fedin VP. Chalcogenide clusters of vanadium, niobium and tantalum. Coord Chem Rev 2004 248 925 14. 

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