STRUCTURAL CHARACTERIZATION OF TWO COPPER(II) COMPLEXES WITH OXIME-TYPE LIGANDS
W.-K. Dong, SH.-SH. Gong, Y.-X. Sun, J.-F. Tong, J. Yao
School of Chemical and Biological Engineering, Lanzhou Jiaotong University
dongwk@126.com
Keywords: synthesis, characterization, crystal structure, oxime-type ligand, copper(II) complex
Pages: 1043-1049
Abstract
Two new linear CuII complexes [Cu(L1)2] (I) (HL1 = (E)-3,5-dichloro-2-hydroxy benzaldehyde O-methyl oxime) and [Cu(L2)2] (II) (HL2 = (E)-3,5-dichloro-2-hydroxy benzaldehyde
O-ethyl oxime) are synthesized and characterized by elemental analysis, IR, UV-Vis, and
X-ray diffraction methods. X-ray crystallographic analyses indicate that complexes I and II have a similar structure consisting of one CuII ion and two L- units. In the complexes, the CuII ion lying on an inversion centre is four-coordinated in a trans-CuN2O2 square planar geometry by two phenolate O and two oxime N atoms from two symmetry-related N,O-bidentate oxime-type ligands. However, the crystal structure of the two complexes is different: complex I forms an infinite three-dimensional supramolecular network structure through intermolecular hydrogen bonding and π⋯π interaction, while complex II forms an infinite one-dimensional supramolecular structure through intermolecular hydrogen bonds.
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