STRUCTURAL CHARACTERIZATION OF TWO COPPER(II) COMPLEXES WITH OXIME-TYPE LIGANDS

Two new linear Cu(II) complexes [Cu(L(1))(2)] (I) (HL(1) = (E)-3,5-dichloro-2-hydroxy benzaldehyde O-methyl oxime) and [Cu(L(2))(2)] (II) (HL(2) = (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 Cu II ion and two L(-) units. In the complexes, the Cu(II) ion lying on an inversion centre is four-coordinated in a trans-CuN(2)O(2) 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 p. p interaction, while complex II forms an infinite one-dimensional supramolecular structure through intermolecular hydrogen bonds.