Synthesis and structural studies of novel Co(III) ternary complexes containing N(4)-substituted thiosemicarbazones of 2-hydroxyacetophenone and heterocyclic bases

• Published in: Polyhedron 2002-11, Vol.21 (24), p.2515-2521
• Main Authors: John, Rohith P, Sreekanth, A, Prathapachandra Kurup, Maliyeckal R, Mobin, Shaikh M
• Format: Article
• Language: English
• Subjects: 1H NMR; Cobalt(III); Electronic spectra; Thiosemicarbazone; X-ray crystal studies
• ISSN: 0277-5387
• DOI: 10.1016/S0277-5387(02)01227-5

An interesting series of eight neutral ternary Co(III) complexes of 2-hydroxyacetophenone N(4)-substituted thiosemicarbazones (H 2L), bidentate heterocyclic bases 2,2′-bipyridine (bipy)/1,10-phenanthroline (phen) and azide with a general formula [MLB(N 3)] were prepared. The complexes were characterized by means of spectroscopic methods. The coordination geometry around Co(III) in all the complexes is distorted octahedral with one dibasic tridentate ligand L 2−, one bidentate heterocyclic base and one terminally coordinated azide group. Crystal structure of the compound CoL 4bipyN 3 was completely solved. All the electronic transitions were assigned. All complexes were diamagnetic indicating cobalt in a d 6 strong field. An interesting series of eight neutral ternary Co(III) complexes of 2-hydroxy-acetophenone N(4)-substituted thiosemicarbazones (H 2L), bidentate heterocyclic bases 2,2′-bipyridine (bipy)/1,10-phenanthroline (phen) and azide with a general formula [MLB(N 3)] were prepared. The complexes were characterized by means of spectroscopic methods. The coordination geometry around Co(III) in all the complexes is distorted octahedral with one dibasic tridentate ligand L 2−, one bidentate heterocyclic base and one terminally coordinated azide group.