SYNTHESES AND PROPERTIES OF MOLECULAR CON DUCTORS BASED ON DMIT ISOLOGOUS CHELATES - CRYSTAL AND MOLECULAR-STRUCTURE OF (1,3-DITHIOLE-2-SELONE-4,5-DISELENOLATO)NICKELATE] - [(CH3)4N][NI(DSISE)2]2

Syntheses and properties of dichalcogenolate chelates of the general t ype [(CH3)4N]n[ML2] (n less-than-or-equal-to 2; M = Ni, Pd, Pt; L = dm it (1, 3-dithiole-2-thione-4,5-dithiolate), dmise (1,3-dithiole-2-selo ne-4,5-dithiolate), dsit (1,3-dithiole-2-thione-4,5-diselenolate), dsi se (1, 3-dithiole-2-selone-4, 5-diselenolate), dsis (1, 3-diselenole-2 -selone-4, 5-diselenolate) are reported. The effects of the chalcogen atom variation in these chelates are discussed by using UV/VIS, IR, EP R, cyclovoltammetric and conductivity data. The x-ray structure of [(C H3)4N][Ni(dsise)2]2 (space group Pccn, a = 7.427(1), b = 39.144(5), c = 11.836(1) angstrom) and the conductivity of the crystal (12 S cm-1 a t room temperature) are given.