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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 30, Number 3
JKCSEZ 30(3)
June 20, 1986 

 
Title
Kinetics of Acid Hydrolysis of trans-Fluoroaquobis(ethylenediamine) Chromate(Ⅲ) Cation

trans-Fluoroaquobis(ethylendiamine) Chromate(Ⅲ) Cation 수화반응 속도에 대한 온도와 압력의 영향
Author
Sang-Oh Oh, Sang-Hyup Lee, Jong-Wan Lim

오상오, 이상협, 임종완
Keywords
Abstract
착물 trans-[Cr(en)2F(H2O)]2+의 hydrolysis에 대한 속도상수를 분광광도법으로 여러가지 온도와 압력에서 측정하였다. 온도 범위는 30℃ ~ 50℃까지이고 압력은 1bar에서 1500bar까지 변화시켰다. 1bar, 30℃에서 측정된 속도상수는 2.632 × 10-5sec-1였다. 속도상수는 일정온도에서 압력이 증가함에 따라 감소하였다. 활성화 부피와 다른 활성화 파라미터들은 이러한 속도상수로 부터 계산되었다. 활성화 부피는 모두 양의 값을 가졌으며 0.447에서 3.152cm3/mol내에 있고, 활성화 엔트로피는 작은 값을 가진다. 이 반응은 흡열반응이고, 실험적인 온도에서 엔탈피 지배 반응이다.

The rates of hydrolysis of the complex, trans-[Cr(en)2F(H2O)]2+, have been investigated using spectrophotometric method at various temperatures and pressure. Temperature was 30℃ to 50℃ and pressure was varied up to 1500bar. The rate constant measured at 30℃ is 2.632 × 10-5sec-1. The rate constants are decrease with increasing pressure at constants temperature. Activation volume and other activation parameters are calculated from these rate constants. The activation volumes are all positive and lie in the limited range 0.447 ∼ 3.152cm3/mol and the activation entropies are small values. From the results, it was found that this reaction was endothermic and enthalphy controlled reaction in the experimental temperature.

Page
307 - 311
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