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KMID : 1059519870310060527
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Journal of the Korean Chemical Society
1987 Volume.31 No. 6 p.527 ~ p.533
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Rates and Mechanism of the Reaction of Aquaoxomolybdenum(IV) Trimer with Thiocyanate
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Kim Chang-Su
Lee Joong-Ho
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Abstract
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Kinetic studies on the complexing of aquamolybdenum(Ⅳ) trimer with thiocyanate have been carried out using the spectrophotometric method. The observed rate constant, kobsd is given by kobsd = {kO + kH[H+]2}(SCN-) + kr. At 25℃ and ionic strength of 2.30 the values of kf and kr are (3.78 ± 0.61) × 10-4M-1s-1 and (6.93 ± 2.39) × 10-4s-1, respectively. Activation parameters are ΔH* = 50.71 ± 6.91 kJmol-1 and ΔS* = -121.65 JK-1mol-1. The mechanism is proposed and discussed.
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KEYWORD
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