The reduction kinetics of pertechnetate by thiocyanate in perchloric acid medium

Yong-fen, Jia; Pilu, Zhang; Zhixuan, Zhu; Fu, Yubin; Fangding, Wang

doi:10.1007/bf02389470

J Radioanal Nucl Chem

1998

DOI: 10.1007/bf02389470

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The reduction kinetics of pertechnetate by thiocyanate in perchloric acid medium

Jia Yong-fen

Zhang Pilu

Zhu Zhixuan

et al.

Abstract: The reduction kinetics of pertechnetate by thiocyanate in perchloric acid is studied by spectrophotometric method. The effect of the concentrations of pertechnetate, hydrogen ion and thiocyanate on the reaction rate is investigated. The kinetic expression at 25 ~ is: dCvii/dt = (2.2_+0.4). 10 3 [TcO 4 ]1.1 [H+]3.2 [SCN ]3.3. The effect of temperature on the reaction rate is studied. The activation energy is 91 kJ/mol. The possible mechanism of the reaction is discussed.

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1999

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Chapter 27. Mechanisms of reactions in solution

Winterton¹

1999

Annu. Rep. Prog. Chem., Sect. A

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Full understanding of a chemical change requires the identity and nature of intermediates formed between reactants and products to be identified and knowledge of the processes of bond making and breaking and of electron transfer to be established. Inorganic reaction mechanisms are thus of intrinsic interest. Moreover, they underpin our understanding of key environmental, biological, medical and industrial processes. This review of the 1998 literature does not, except for studies of particular importance or interest, cover homogeneous catalysis or redox processes involving organic substrates, organic reactions of the heavier p-block elements, or fluxional, photochemical, electrochemical, solid-state or heterogeneous processes.A new journal, Inorg. React. Mech., and a special issue of Transition Met. Chem. are devoted to inorganic mechanisms. Activation volumes in solution, models for electron transfer, the use of density functional theory and electron-transfer reactions of polyoxymetalates have been reviewed and the application of genetic-algorithm and non-linear optimization methods to the treatment of kinetic data described. Stoppedflow EXAFS has been used to study short-lived intermediates. Studies of processes on the femtosecond timescaleare noted. Redox reactionsA series of papers on electron transfer in proteinsand a review by Marcus on theory and experiment in electron-transfer reactions have appeared in a special issue of J. Electroanal. Chem. Long range electron transferDifferent sites on cytochrome bc are associated with oxidation and reduction, with the Fe-S protein component of cytochrome bc acting as an electron shuttle between †Dedicated to the memory of Professor Bob Hay, an esteemed friend and colleague.

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Chapter 27. Mechanisms of reactions in solution

Winterton¹

1999

Annu. Rep. Prog. Chem., Sect. A

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The reduction kinetics of pertechnetate by thiocyanate in perchloric acid medium

Cited by 1 publication

References 4 publications

Chapter 27. Mechanisms of reactions in solution

Chapter 27. Mechanisms of reactions in solution

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