4-COORDINATE COPPER(I) IODIDE COMPLEXES WITH TRIPHENYLPHOSPHINE AND HETEROCYCLIC THIONE LIGANDS - THE CRYSTAL-STRUCTURE OF [CU(PPH3)2(PYMTH)I]

[Cu(PPh3)I]4 reacts with heterocyclic thiones (L) [L = pyrimidine-2-th ione (pymtH), 1,3-thiazoline-2-thione (tzdtH), 1,3-imidazoline-2-thion e (imtH), benz-1,3-imidazoline-2-thione (bzimtH-2) and benz-1,3-thiazo line-2-thione (bztztH)] in the presence of triphenylphosphine to give mononuclear complexes of the general formula [Cu(PPh3)2 (L)I]. These c omplexes have been characterized by various physicochemical methods. T he crystal structure of [Cu(PPh3)2(pymtH)I] has been determined by sin gle-crystal X-ray diffraction methods. The molecule is mononuclear, wi th a distorted tetrahedral geometry and bond lengths Cu-S = 2.338(4), Cu-I = 2.674(2), Cu-P = 2.296(4) and 2.303(4) angstrom.