template synthesis of un-symmetrical tetradentate schiff base complexes of ni(ii), co(ii), zn(ii) and x-ray structure of ni(ii) complex

metal complexes, ml (m=ni, cu, co and zn) of unsymmetrical tetradentate schiff base have been synthesized by the template reaction of the half-units n-(1-hydroxy-2-acetonaphthone)-1-amino-2-phenyleneimine)(hl1) with 2-pyrroleca-rbaldehyde. the complexes have been characterized by elemental analysis, ir, 1h nmr and uv spectroscopy. the crystal structure of the ni(ii) complex has been determined by x-ray and exhibits distorted square-planar conformation. crystals of nil are orthorhombic, space group p212121, with a = 7.1635(6), b = 11.6815(10), c = 20.7217(17) ? and z = 4. the ni-o and ni-n bonds have very similar lengths and form a regular square-planar structure.