SPECTROSCOPIC AND ELECTRICAL-PROPERTIES OF THE [W(C3SE5)(3)](2-) ANION COMPLEX (C3SE52-=1,3-DISELENOLE-2-SELONE-4,5-DISELENOLATE) AND THE OXIDIZED SPECIES

[NBu(4)(n)](2)[W(C3Se5)(3)](C3Se52-=1,3-diselenole-2-selone-4,5-diselenolate(2-)) was prepared by the reaction of Na-2[C3Se5] with WCl6 in ethanol, followed by addition of [NBu(4)(n)]Br. The cyclic voltammogram in dichloromethane exhibits two oxidation peaks at -0.04 and +0.03 V (versus SCE). The complex reacted with [Fe(C(5)Me(5))(2)][BF4], iodine or [TTF](3)[BF4](2) (TTF+= the tetrathiafulvalenium radical cation) in acetonitrile to afford the oxidized complexes [Fe(C(5)Me(5))(2)](0.5)[W(C3Se5)(3)], [NBu(4)(n)](0.1)[W(C3Se5)(3)] and [TTF](0.5)[W(C3Se5)(3)], respectively. Current-controlled electrochemical oxidation of the complex in acetonitrile gave [NBu(n4)](0.6)[W(C3Se5)(3)]. The oxidized complexes exhibit electrical conductivities of 4.7 x 10(-5)-1.5 x 10(-3) S cm(-1) at room temperature measured for compacted pellets. Electronic absorption, IR and ESR spectra of these complexes are discussed.