Synthetic, spectral and thermal studies of cobalt(II), nickel(II), zinc(ll) and cadmium(II) complexes with amino acid schiff bases

Abstract

A few complexes of Co(II), Ni(II), Zn(II) and Cd(II) have been isolated by the metal ion template condensation of amino acids (L-phenylalanine, L-leucine, L-histidine or L-tryptophan) and aldehyde/ketone (salicylaldehyde, o-hydroxynaphthaldehyde, pyruvic acid, <i>o</i>-vanillin or isatin). The elemental analysis, conductivity and magnetic susceptibility measurements, IR, ¹H NMR and electronic spectral data indicate that the ligands function as dibasic terdentate with O, N, O donor set. The thermal degradation of Co(isa-L-phel)₂, Ni(OV-L-phe).3H₂O, Zn(OHN-L-phe).3H₂O, Zn(sal-L-leu).3H₂O, Zn(OV-L-his).3H₂O, Cd(OV-L-try).3H₂O and Cd(PyA-L-try).3H₂O is studied in air by differential thermal analysis and dynamic thermogravimetry technique from ambient temperature to 900°C.