THERMODYNAMIC PARAMETERS FOR COBALT-QUINONE ELECTRON-TRANSFER AND SPIN TRANSITION STEPS OF THE CO-III(BPY)(3,5-DBSQ)(3,5-DBCAT)/CO-II(BPY)(3,5-DBSQ)(2) VALENCE TAUTOMERIC EQUILIBRIUM

Authors
PIERPONT, CGJUNG, OS
Issue Date
1995-08-02
Publisher
AMER CHEMICAL SOC
Citation
INORGANIC CHEMISTRY, v.34, no.16, pp.4281 - 4283
Abstract
Equilibria between Co-III(bpy)(3,5-DBSQ)(3,5-DBCat) and Co-II(bpy)(3,5-DBSQ)(2) redox isomers have been studied in toluene solution and in the solid state. Enthalpy changes are nearly the same in both media, and Delta H is determined by changes in Co-O,N bond energies with the transition from low-spin Co(III) to high-spin Co(II). Temperature dependence of equilibria is associated with a large entropy change, resulting primarily from low-frequency shifts in vibrational modes with metal reduction.
Keywords
METAL-COMPLEXES; SEMIQUINONE LIGANDS; ENTROPY CHANGES; REDOX COUPLES; CATECHOLATE; METAL-COMPLEXES; SEMIQUINONE LIGANDS; ENTROPY CHANGES; REDOX COUPLES; CATECHOLATE
ISSN
0020-1669
URI
https://pubs.kist.re.kr/handle/201004/145017
DOI
10.1021/ic00120a041
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KIST Article > Others
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