Syntheses, Supramolecular Structures and Spectroscopic Properties of Cu(II) and Ni(II) Complexes with Schiff Base Containing Oxime Group

Two Cu(II) and Ni(II) complexes, [Cu(L-1)(2)]center dot(1,4-dioxane) (1) (HL1=8-(((4-(1-((benzyloxy)imino)ethyl)phenyl)imino)methyl)-7-hydroxy-4-methyl-2H-chromen-2-one) and[Ni(L-2)(2)] (2) (HL2=1-(4-(((2-hydroxynaphthalen-1-yl) methylene) amino) phenyl) ethanone O-benzyloxime), have been synthesized and characterized by elemental analyses, IR spectra, UV-Vis spectra, fluorescence spectra and X-ray single crystal diffraction method. X-ray crystallographic analysis shows that the Cu(II) and Ni(II) ions are all four-coordinated in a trans-N2O2 slightly distorted square-planar geometry by two hydroxy O and two imine N atoms from two N, O-bidentate Schiff base ligands. Moreover, complex 1 links some other molecules into an infinite 3D supramolecular structure by intermolecular hydrogen bonds and pi center dot center dot center dot pi stacking interactions, while complex 2 forms 1D infinite chain via intermolecular pi center dot center dot center dot pi stacking interactions. Furthermore, the fluorescence property of HL1, HL2 and their metal complexes 1 and 2 are discussed. CCDC: 1542901, 1; 1857932, 2.