Synthesis and room temperature single crystal EPR studies of a dinickel complex having an {Ni2(m-phenoxide)2}2+ unit supported by a macrocyclic ligand environment [Ni2(L)2(OClO3)2] [L = 2-[(4-methyl-pyridin-2-ylimino)- methyl]-phenol]

A bimetallic nickel(II) complex with the ligand Hsalamp (2-[(4-methylpyridin- 2-ylimino)-methyl]-phenol), having the molecular formula, Ni2C26H22 N4O10Cl2, is synthesized and characterized by elemental, UV-Vis, IR and EPR studies. The IR spectrum confirms the presence of coordinated perchlorate ion and the UV-Vis. spectrum substantiates that the geometry around the metal ion is distorted square pyramidal. In the solvent methanol, the complex undergoes dissociation indicating the nature of the complex to be 1 : 2 electrolyte. The single crystal EPR studies indicate that the zero-field splitting is not large and the spectra can be observed even at room temperature, not so common for a nickel(II) ion. The spin Hamiltonian parameters calculated from single crystal rotations are: g – 2,377, 2,219, 2,071 and D – 9,7, 4,2 and – 13,9 mT. Optical and electron paramagnetic spectral data have been used to obtain the parameters Dq, B and C.