摘要：

Copper(II) complexes of general formula, [Cu(NNS)(H 2 O) x X] · n H 2 O (NNS = uninegatively charged tridentate thiosemicarbazone ligand formed from 6-methyl-2-formylpyridine; X = NCS , CH 3 COO , N 3 ; x = 0,1; n = 0.5, 1) and [Cu(HNNS)(H 2 O)(SO 4 )] · H 2 0 have been synthesized and characterized by a variety of physico-chemical techniques. Magnetic and spectroscopic evidence support a square-planar structure for the [Cu(NNS)X] (X = NCS , N 3 ) complexes and a five-coordinate structure for the [Cu(HNNS)(H 2 O)(SO 4 )] · H 2 O complex. The crystal structures of the [Cu(NNS)(CH 3 COO)(H 2 O)] and [Cu(HNNS)(H 2 O)(SO 4 )] · H 2 O complexes have been determined by X-ray diffraction. The acetato complex has a distorted square-pyramidal geometry with the thiosemicarbazone ligand acting as a uninegatively charged tridentate NNS chelating agent and the fourth and fifth coordination positions of the copper(II) ion are occupied by a unidentate acetate and water ligand, respectively. The sulphato-complex is also five-coordinate with the thiosemicarbazone coordinated as a neutral NNS ligand and the fourth and fifth coordination sites are occupied by a water molecule and a unidentate sulphate ligand, respectively.

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