SYNTHESIS AND PHOTOCHEMICAL STUDY OF CU(I) COMPLEXES WITH TRI-P-TOLYLPHOSPHINE AND HETEROCYCLIC THIONES - THE CRYSTAL-STRUCTURE OF [CUCL(PYMTH)(P-CH3C6H4)3P]2

Reactions of [Cu(tptp)X]4 (tptp = tri-p-tolyl-phosphine, X = Cl, Br or I) with heterocyclic thiones (L) [L = pyridine-2-thione (py2SH), pyrimidine-2-thione (pymtH), 1,3-thiazolidine-2-thione (tzdtH), 1-methyl-1,3-imidazoline-2-thione (meimtH), benz-1,3-imidazoline-2-thione (bzimtH2) and quinoline-2-thione (qntH)] yield binuclear complexes of the general formula [Cu(tptp)(L)X]2. The complexes have been characterized by elemental analyses, IR, UV-Vis and H-1 NMR spectroscopy. The photochemical behaviour of these complexes in chloroform solutions has been investigated. Irradiation causes the release of the phosphine and the formation of dinuclear compounds containing a Cu2S2 core. The crystal structure of [Cu(tptp)(pymtH)Cl]2 has been determined by single-crystal X-ray diffraction methods. The red crystals are triclinic, space group P1BAR with a = 19.512(2), b = 10.388(3), c = 14.474(2) angstrom, a = 99.00(2), beta = 73.28(1), gamma = 116.22(2)-degrees, D(calc) = 1.394 M m-3, V = 1228.2(4) angstrom3 and Z = 1. The molecule contains a planar Cu2S2 moiety with Cu-S bond lengths of 2.356(1) and 2.470(1) angstrom. The Cu-P and Cu-Cl distances are 2.227(1) and 2.300(1) angstrom, respectively. The Cu...Cu separation is 3.316(0) angstrom.