Cezar Spinu*, Angela Kriza**
*University of Craiova, Faculty of Chemistry, Department of
Inorganic Chemistry
** University of Bucharest, Faculty of Chemistry, Department of
Inorganic Chemistry
ABSTRACT
Cobalt (II), nickel (II) and copper (II) complexes of type ML2Cl2,
where M is CoII, NiII and CuII, and L is Schiff base formed by condensation
of 2-thiophenecarboxaldehyde and propylamine, N-[2-thienylmethylidene]-1-propanamine
(TNAP), or ethylamine, N-[2-thienylmethylidene]ethanamine (TNAE), have
been prepared and characterised by elemental analysis, magnetic and
spectroscopic measurements. Elemental analysis suggests the stoichiometry
to be 1:2 (metal:ligand). Magnetic susceptibility data coupled with electronic
and ESR spectra suggest a distorted octahedral structure for the Cu(II)
and Ni(TNAE)2Cl2 complexes, a tetrahedral geometry for Ni(TNAP)2Cl2
and a D4h symmetry for the Co(II) complexes. Infrared and NMR spectra of
the complexes agree with the co-ordination to the central metal atom through
nitrogen and sulfur atoms. Conductance measurements suggest the non-electrolytic
nature of the complexes and the 1:2 electrolytic nature of the Ni(TNAP)2Cl2.