SYNTHESIS AND CHARACTERIZATION OF METALLO CENE CHELATES OF HETEROCYCLIC 1,2-DISELENOLATES

Synthesis and properties of metallocen diselenolates Cp(2)(R)ML (Cp(R) = eta(5)-C5H4CH3 (Cp'); eta(5)-C-5(CH3)(4)C2H5 (Cp degrees)) of titan ium(IV) and vanadium(IV) with L = dsit (1,3-dithiole-2-thione-4,5-dise lenolate), dsise (1,3-dithiole-2-selone-4,5-diselenolate) dsit se (1,3 -thiaselenole-2-selone-4,5-diselenolate) and dsis (1,3-diselenole-2-se lone-4,5-diselenolate) are described. The structures of these compound s in solution are discussed using H-1, C-13, Se-77 NMR and EPR data. T heir voltammetric behaviour is investigated in dichloromethane. The ac tivation parameters of the chelate ring inversion of the titanocene di selenolates (Cp(2)(R)TiL) and the x-ray structures of Cp(2)'Ti(dsit), Cp(2) degrees Ti(dsit); Cp(2) degrees Ti(dsise) (2 modifications) and Cp(2) degrees Ti(dsis) are reported.