Syntheses and Structures of Two Copper(II) Complexes with Salicyl Mono-oxime Ligands

Two new Cu-II complexes, [Cu(L-1)(2)] (1) (HL1=(E)-3,5-dibromo-2-hydroxybenzaldehyde O-methyl oxime) and [Cu(L-2)(2)] (2) (HL2=(E)-2-hydroxy-5-nitrobenzaldehyde O-ethyl oxime), have been synthesized and characterized by elemental analyses, IR spectra, UV-Vis spectra and X-ray diffraction methods. X-ray crystallographic analyses show that complexes 1 and 2 are mono-nuclear structure. The four-coordinated Cu-II atoms of the two complexes lie in the N2O2 coordination sphere of two mono-oxime ligands, and complex 1 has a square planar geometry distorted tetrahedrally, whereas complex 2 has a regular square planar geometry. Complex 1 forms an infinite 1D chain-like supramolecular structure by intermolecular hydrogen bonds, while complex 2 forms an infinite 2D supramolecular structure by intermolecular hydrogen bonds and pi ... pi packing interaction. CCDC: 757700, 1; 776433, 2.