Preparation, characterization and thermogravimetric studies of (N,N '-cis-1,2-cyclohexylene bis(salicylideneaminato)]cobalt(II) and [N,N '-(+/-)-trans-1,2-cyclohexylene bis(salicylideneaminato)]cobalt(II)

The synthesis, characterization and thermogravimetric studies of [N,N'-cis- 1,2-cyclohexylene bis(salicylideneaminato)]cobalt(II), [Co(II)(c-Salcn)], a nd [N,N'-(+/-)-trans-1,2-cyclohexylene bis(salicylideneaminato)]cobalt(II), [Co(II)(t-Salcn)l are reported. The free ligands were characterized by ele mental analyses, melting points, IR, electronic, and H-1 and C-13 NMR spect ra. The cobalt(II) complexes were characterized by elemental analyses, melt ing points, IR and electronic spectra. The IR and electronic spectra of the free ligands and the complexes are compared and discussed. The thermogravi metric data for both isomers showed two-step decomposition, but the trans i somer was less stable than the cis. Different cobalt oxides are formed as t he final decomposition product depending on the atmosphere used, nitrogen o r air. (C) 2001 Elsevier Science B.V. All rights reserved.