Double azido-bridged and mixed-bridged binuclear copper(II) and nickel(II) compounds with N,N,O-donor Schiff bases: Synthesis, structure, magnetic and DFT study

Two dinuclear complexes mu(1,1)-azido bridged [Cu(L1)(N-3)](2) (1) and mu-phenoxo, mu(1,1)-gtrazido bridged [Ni-2(L-2)(2)(mu(1,1)-N-3)(N-3) H2O] (2) bearing HL1 and HL2 as a blocking co-ligands produced by the 1:1 condensation of N-benzyl ethylenediamine with ortho-hydroxy acetophenone and N-methyl propanediamine with 3-methoxy salicylaldehyde respectively, have been synthesized and successfully characterized by elemental analyses, IR and electronic spectroscopy, single-crystal X-ray diffraction, variable temperature magnetic study and DFT studies. X-ray crystal structures of 1 reveal that the Cu(II) ion displays a five-coordinate square pyramidal coordination with a centro-symmetric mu(1,1)-azido bridging and forming a dimeric structure. The complex 2 compose of octahedrally coordinated dimeric nickel(II) complex with mu-phenoxo, mu(1,1)-azido bridging. Variable-temperature magnetic study (between 4.5 and 300 K) indicates a very weak and a moderate ferromagnetic intramolecular interaction are mediating through the metal centers for both of the complexes. The magnetic results have also been supported by the theoretical interpretations for both complexes. (C) 2015 Elsevier Ltd. All rights reserved.