Thermoanalytical Study of Dioxygencobalt(III) Complexes withN,N′-Ethylenebis(salicylideneaminate) and Its Derivatives

Autor:	Setsuko Kinoshita, Takumi Etoh, Hisanobu Wakita, Kikuo Miyokawa
Rok vydání:	1992
Předmět:	Thermogravimetry chemistry.chemical_compound Reaction mechanism Reaction rate constant Schiff base chemistry Transition metal dioxygen complex Stereochemistry Enthalpy Physical chemistry General Chemistry Thermal analysis Kinetic energy
Zdroj:	Bulletin of the Chemical Society of Japan. 65:3374-3377
ISSN:	1348-0634 0009-2673
DOI:	10.1246/bcsj.65.3374
Popis:	The oxygen-dissociation reactions of [Co(3-X-salen)]2O2, where 3-X-salen is N,N′-ethylenebis(3-substituted salicylideneaminate) dianion, X = H (1), OCH3 (2), OC2H5 (3), NO2 (4), have been studied by means of a thermoanalytical technique. The heat of the reaction, determined by DTA, ranges from 88 (4) to 120 (2) kJ mol−1; the electron-releasing substituents tend to stabilize the Co–O2 bonding. The O2-dissociation process is best described by the first-order equation and the activation enthalpies range from 117 (4) to 145 (2) kJ mol−1 and the electron-releasing substituents increase the activation enthalpy. A kinetic compensation effect was observed, except for 3, which is the most stable of these complexes due to its small activation entropic value.
Databáze:	OpenAIRE
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