Studies On Some Transition Metal Mixed Ligands Complexes Glycinyldithiocarbamate and 8-hydroxyquinoline moiety

Abstract

This paper reports the isolation and characterisation of mixed ligand complexes of the types Ba[M(Ox)₂glydtc], [M₂′(Ox)₄glydtc], [M₂(QA)₂glydtc] and [M₂′(QA)₄glydtc] (where glydtc=glycinyldithiocarbamate; HOx=8-hydroxyqinoline;HQA=p-methyl-5-phenylazo-8-hydroxyquinoline and M=Co(II),Ni(II) or Cu(II); M′=Fe(III) or Cr(III). The structures for the complexes have been elucidated on the basis of elemental analysis, electronic, IR and mass spectroscopy. Electronic spectral data for the complexes were in accordance with an octahedral environment around the central metal ions in all metal chelates except for [Co₂(QA)₂glydtc] and [Ni₂(QA)₂glydtc] where the structure around Co(II) and Ni(II) may be tetrahedral. The complexes were proposed to be dimeric except those of Ba[M(Ox)₂glydtc]. A study of the thermal decomposition of the complexes has also been carried out. For Ba[M(Ox)₂glydtc], elimination of carbon dioxide was observed. However, evolution of nitrogen and formation of tolyl radicals occur for [M₂(QA)₂glydtc] and [M₂′(QA)₄glydtc]. Kinetic parameters for the various decomposition stages were calculated using the Coats–Redfern and Horowitz–Metzgerequations.