Novel binuclear copper(II) complexes of di-2-pyridyl ketone N(4)-methyl, N(4)-phenylthiosemicarbazone: Structural and spectral investigations
作者:Varughese Philip、V. Suni、Maliyeckal R. Prathapachandra Kurup、Munirathinam Nethaji
DOI:10.1016/j.poly.2005.03.064
日期:2005.7
Four binuclear complexes [Cu(dptsc)Cl](2) center dot 3H(2)O (1), [Cu(dptsc)Br](2) (2), [Cu(dptsc)(p-N-3)](2) (3) and [Cu(dptsc)(NO3)](2) center dot H2O (4) (where Hdptsc = di-2-pyridyl ketone N(4)-methyl, N(4)-phenylthiosemicarbazone) have been synthesized and physicochemically characterized. Each Cu(II) atom in the monomeric unit exists in a penta-coordinate environment. The molecular structures of [Cu(dptsc)Br](2) and [Cu(dptsc)(mu-N-3)](2) are resolved by single-crystal X-ray diffraction studies. Both the crystals are centrosymmetric dimers where each ligand unit coordinates through one of the pyridyl nitrogens, azomethine nitrogen and thiolate sulfur to Cu(II). A distorted square pyramidal geometry is observed around Cu(II) for both the complexes, where the N(2) nitrogen of the second ligand unit coordinates to the first Cu(II) center in compound 2 and N(6) nitrogen of the azido group bridges both the Cu(II) centers in compound 3. Spectral characterization corroborate the structural studies. (c) 2005 Elsevier Ltd. All rights reserved.