A kinetic study of the reduction of the octacyanomolybdate(V) ion by the hydroxide ion

被引：9
作者：
Dennis, C. Robert [1 ]
Potgieter, I. M. [1 ]
Basson, S. S. [1 ]
机构：
[1] Univ Orange Free State, Dept Chem, ZA-9300 Bloemfontein, South Africa
来源：
REACTION KINETICS MECHANISMS AND CATALYSIS | 2010年 / 99卷 / 01期
关键词：
Kinetics; Redox; Activation parameters; ALKALINE-MEDIUM; OCTACYANOTUNGSTATE(V) IONS; OXIDATION; COMPLEXES; DIHYDRATE;
D O I：
10.1007/s11144-009-0115-0
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The kinetics of the oxidation of hydroxide ions by octacyanomolybdate(V) ions has been studied in the [OH(-)] range between 0.5 and 4.0 mol dm(-3). The reaction displays first-order kinetics in both [Mo(CN)(8)(3-)] and [OH(-)] and is consistent with the rate law R = k [Mo(CN)(8)(3-)] [OH(-)]. From the Bronsted-Bjerrum equation, it was established that the activated complex is formed by the ions Mo(CN)(8)(3-) and OH(-). A reaction mechanism is proposed for the reaction with a rate constant of 1.13 +/- 0.03 x 10(-2) dm(3) mol(-1) s(-1), activation enthalpy, Delta H#, of 20.1 +/- 09 kJ mol(-1) and activation entropy, Delta S*, of -213 +/- 3 J K(-1) mol(-1).
引用
收藏
页码：63 / 68
页数：6
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