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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 31, Number 6
JKCSEZ 31(6)
December 20, 1987

Title	Rates and Mechanism of the Reaction of Aquaoxomolybdenum(Ⅳ) Trimer with Thiocyanate 아쿠아옥소몰리브덴(Ⅳ) 삼합체 착물과 티오시안산이온과의 반응에 대한 속도와 메카니즘
Author	Chang-Su Kim, Joong-Ho Lee 김창수, 이중호
Keywords
Abstract	아쿠아옥소몰리브덴(Ⅳ) 삼합체와 티오시안산이온과의 착물생성반응에 대한 속도론적 연구를 분광광도법으로 행하였다. 이 반응의 관찰된 속도상수, kobsd는 다음과 같이 주어진다. kobsd = {kO + kH[H+]2}(SCN-) + kr. 이온세기가 2.30이고 온도가 25℃일때 kf 와 kr의 값은 각각 (3.78 ± 0.61) × 10-4M-1s-1 과 (6.93 ± 2.39) × 10-4s-1이다. 활성화파라미터는 ΔH* = 50.71 ± 6.91 kJmol-1이고 ΔS* = -121.65 JK-1mol-1이다. 이 반응의 메카니즘에 대하여 논의된다. 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.
Page	527 - 533
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