Synthesis, characterization and DFT study of nickel(II) complexes of a N2O donor Schiff base with different pseudo-halides: Formation of supra-molecular architectures by C–H⋯π interactions
摘要:
Four new mono-nuclear square planar nickel(II) complexes [Ni(L)(N-3)] (1), [Ni(L)(NCO)] (2), [Ni(L)(NCS)] (3) and [Ni(L)(NCSe)] (4), where HL = 2-(1-(2-(diethylamino)ethylimino)ethyl)naphthalen-1-ol, have been synthesized and characterized by elemental analysis, IR, UV-Vis, fluorescence spectroscopy and single crystal X-ray diffraction studies. The ligand is so designed that there is no possibility of hydrogen bonding interactions in all the four complexes. However, the C-H center dot center dot center dot pi interactions lead to the formation of one-dimensional chain in complex 2 and two-dimensional sheets in the other three complexes. The geometries of all complexes are optimized in the singlet ground states by DFT calculation. Electronic spectra of the complexes are explained using TD DFT calculation. (C) 2014 Elsevier Ltd. All rights reserved.