International Science Community Association Research Journal of Chemical Sciences 2231-606X 8 7 2018 07 18 Activity of oxidative coupling catalysts with carbon disulphide to generate the first new redox dithiocarbonato moiety [(Pip)nCuX]4(CS2O)2 1 8 EN Mohamed A. El-Sayed 1 Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt Ahmed H. Abdel- Salam 2 Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt and Chemistry Department, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia Hemmat A. El-Badawy 3 Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt Ali El- Dissouky 4 Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt > Research Paper 2018 3 28 2018 07 18 A new series of tetranuclear [(Pip)nCuX]4(CS2O)2, where Pip = Piperidine, n = 1 or 2 X = Cl or Br, are obtained according to the reaction of the lewis acid [(Pip)nCuX]4O2 towards the lewis base CS2 at room temperature. The synthesised compounds are characterized using molecular weight determination, elemental analysis and spectral techniques (FTIR, UV/Vis. and EPR). The FTIR spectral data showed that CS2O2- group acts as a dibasic bidentate or tridentate bridging ligand for n=2 or 1, respectively. The bridging CS2O2- containing tetranuclear complexes display a CS2O2- – Cu2+ Charge transfer band at 430-410nm for all [(Pip)nCuX]4(CS2O)2 complexes with molar absorptivity varying from 4000 to 14000M- cm-1. Bidentate bridging anion (CS2O)2- in [(Pip)2CuX]4(CS2O)2 shows another charge transfer with Cu(II), at 605nm and 575nm with molecular absorptivities 810 and 970M-1cm-1 for X=Cl and Br respectively. The electrochemical behavior of the new tetranuclear complexes are studied where the dithiocarbonato anion in [(Pip)nCuX]4(CS2O)2 is found to be electrochemically active showing quasi-reversible peaks at a more positive potentials, when compared with Cu(II) centres. The complexes are shown to be catalytically inactive toward the oxidation of 2,6-dimethyl phenol unlike their oxo and carbonato analogues. Copyright@ International Science Community Association