VALENCE TAUTOMERISM IN A COBALT COMPLEX OF A SCHIFF-BASE DIQUINONE LIGAND

Authors
CANESCHI A CORNIA A DEI A
Citation
A. Caneschi et al., VALENCE TAUTOMERISM IN A COBALT COMPLEX OF A SCHIFF-BASE DIQUINONE LIGAND, Inorganic chemistry, 37(13), 1998, pp. 3419
Citations number
34
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Inorganic chemistry → ACNP
ISSN journal
00201669
Volume
37
Issue
13
Year of publication
1998
Database
ISI
SICI code
0020-1669(1998)37:13<3419:VTIACC>2.0.ZU;2-W
Abstract
The cobalt(III) complex of a Schiff base diquinone ligand Co-III(Cat-N -BQ)(Cat-N-SQ) undergoes an entropy-driven valence tautomeric equilibr ium in solution yielding the Co-II(Cat-N-BQ)(2) species. This suggesti on is supported by variable temperature electronic and H-1 NMR spectra , as well as by solution magnetic susceptibility data. The calculated thermodynamic quantities associated to the redox equilibrium are Delta H = 42.0(0.8) kJ mol(-1) and Delta S = 140 (3) J mol(-1) K-1.