Synthesis, spectral and magnetic susceptibility studies on tetrachloro metal(II)phthalocyanines

The present paper describes a simple method for the synthesis of symmetrically substituted 1,8,15,22-tetrachloro phthalocyanines of copper, cobalt, nickel and zinc. The title complexes are synthesized from the corresponding tetraamino metal phthalocyanines by modified Sandmeyers method and in turn the tetraamino metal phthalocyanines are prepared from 3-nitrophthalic acid. The bluish-green coloured tetrachloro metal phthalocyanine complexes are characterized by elemental, electronic, IR, magnetic susceptibility and X-ray powder diffraction studies to check the purity and the structural integrity. The magnetic susceptibility studies revealed that, the experimental values are higher than that of the spin only value magnetic moment, and the presence of intermolecular co-operative effects.