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.