Adduct Compounds (MCl5)2(β-P4Ch4) with M = Nb, Ta and Ch = S, Se

Abstract

Adduct compounds of the general composition (MCl5)2(β -P4Ch4), M = Nb, Ta and Ch = S, Se, were obtained from solutions of M2Cl10 and P4Ch3 in CS2 / n-hexane. The compounds are isotypic with (NbCl5)2(β -P4S4), crystallizing in the monoclinic space group P 21/n (no. 14) with Z = 4. The lattice constants are a = 6.304(2), b = 13.071(3), c = 26.552(6) Å , β = 93.74(3)◦, V = 2183(1) Å3 for (TaCl5)2(β -P4S4), a = 6.360(2), b = 13.322(3), c = 26.710(6) Å , β = 93.81(3)0, V = 2258(1) Å3 for (TaCl5)2(β -P4Se4), and a = 6.334(2), b = 13.267(6), c = 26.583(7) Å , β = 93.71(3)0, V = 2229(2) Å3 for (NbCl5)2(β -P4Se4). The adduct molecules consist of two MCl5 units which are linked with two of the basal phosphorus atoms of the central β -P4Ch4 cage.