Some copper(II), nickel(II) and cobalt(II) complexes of naphthalene analogues of 2’-hydroxychalcones have been synthesized and characterized. The complexes have the general formula ML2.XH2O (X=2 or 0) where, L is the deprotonated ligand, the naphthyl chalcone and M is the divalent metal ion. The present paper deals with the effect of strong resonance stabilized intramolecular hydrogen bonding on the IR spectral properties of the naphthalene analogues of 2’-hydroxychalcones as mentioned above and also on their complexation with transition metals such as Cu(II), Ni(II) and Co(II). The conjugated chelation alters considerably the IR spectral properties of these compounds and plays a prominent role in coordination chemistry. IR spectroscopy is the most sensitive and direct method for the study of hydrogen bonding.
Chalcones, Metal complexes, Intramolecular hydrogen bonding, Conjugated chelation