COPPER(I) COMPLEXES WITH 4,6-DIMETHYLPYRIMIDINE-2-THIONE (HDMPYMT) - THE CRYSTAL AND MOLECULAR-STRUCTURE OF [CU6(DMPYMT)6]

The complex [Cu6(dmpymt)6].H2O was synthesised by electrochemical oxidation of copper in an acetonitrile solution of the neutral ligand 4,6-dimethylpyrimidine-2-thione (Hdmpymt). The reaction of [Cu6(dmpymt)6] with 1,2-bis(diphenylphosphino)methane (dppm) and 1,2-bis(diphenylphosphino)ethane (dppe) yielded compounds of general formulae [Cu(dmpymt)(dppm)] and [Cu2(dmpymt)2-(dppe)3]. The molecular structure of [Cu6(dmpymt)6] was determined: the crystals are triclinic, space group P1, a = 11.432(3), b = 13.395(2), c = 15.694(4) angstrom, alpha = 80.28(2), beta = 87.75(2), gamma = 73.87(2)-degrees and Z = 2. The six copper atoms are arranged with distorted-octahedral geometry, each copper atom being trigonally co-ordinated to one nitrogen and two sulfur atoms of three different ligands. Infrared, H-1, C-13 and P-31 NMR spectral data are presented for all the compounds.