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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 34, Number 11
BKCSDE 34(11)
November 20, 2013 

Synthesis and Crystal Structures of Copper(II) Complexes with Schiff Base Ligands: [Cu2(acpy-mdtc)2(HBA)(ClO4)]·H2O and [Cu2(acpy-phtsc)2(HBA)]·ClO4
Bon Kweon Koo
Dinuclear Cu(II)-complexes, Schiff base, Benzilic acid, Crystal structures
Two new Cu(II) complexes, [Cu2(acpy-mdtc)2(HBA)(ClO4)]·H2O (1) (acpy-mdtc− = 2-acetylpyridine Smethyldithiocarbamate and HBA− = benzilic acid anion) and [Cu2(acpy-phtsc)2(HBA)]·ClO4 (2) (acpy-phtsc− = 2-acetylpyridine 4-phenyl-3-thiosemicarbazate) have been synthesized and characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, and single crystal X-ray diffraction. The X-ray analysis reveals that the structures of 1 and 2 are dinuclear copper(II) complexes bridged by two thiolate sulfur atoms of Schiff base ligand and bidentate bridging HBA− anion. For 1, each of the two copper atoms has different coordination environments. Cu1 adopts a five-coordinate square-pyramidal with a N2OS2 donor, while Cu2 exhibits a distorted octahedral geometry in a N2O2S2 manner. For 2, two Cu(II) ions all have a fivecoordinate square-pyramidal with a N2OS2 donor. In each complex, the Schiff base ligand is coordinated to copper ions as a tridentate thiol mode.
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