Synthesis, structure and electrochemical behaviour of octahedral nickel(II) complexes with one 1,1-dithio and one macrocyclic ligand

Add time:08/29/2019    Source:sciencedirect.com

The synthesis and electrochemical behaviour of [Ni(DL-CTH)L](ClO4) and [Ni(Cy)L′](ClO4), where DL-CTH is the racemic isomer of 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, Cy is 1,4,8,11-tetraazacyclotetradecane (Cyclam), L is dimethyldithiocarbamate (Me2Dtc), diethyldithiocarbamate (Et2Dtc), pyrrolidindithiocarbamate (PyrrDtc), ethylxanthogenate (Etxant), thioacetate (Tac) and acetate (Ac) and L′ are the same ligands except Tac and Ac, are described. The structure of [Ni(DL-CTH) (Et2Dtc)](ClO4) is also reported. This complex crystallizes in the monoclinic space group P21/a with cell parameters a = 19.551(4), b = 13.446(3), c = 11.428(3) Å, β = 95.54(3)° and Z = 4. The isolated [Ni(DL-CTH)(Et2Dtc)]+ cation shows a distorted cis-octahedral coordination around the nickel(II) ion. The electrochemistry of these compounds indicates oxidation processes but with decomposition of the organic part, giving nickel(II) species with, probably, polymeric dithio derivatives.

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