The Effect of Pressure on the SF2 Cleavage Reaction of Tetramethyltin with Iodine 


Vol. 37,  No. 3, pp. 287-293, Jun.  1993


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  Abstract

n-헥산과 아세톤 용매내에서 요오드와 테트라메틸주석간의 전하이동 상호작용을 분광학적 방법으로 연구하였다. 이들의 결과로부터 일시적인 전하이동착물의 흡수 스펙트럼이 관찰되었으며, 흡수 스펙트럼의 후속적인 감소현상이 요오드에 의한 테트라메틸주석의 분해반응임을 알았다.(iododestannylation). 따라서 iododestannylation에 대한 속도상수를 온도 10, 25 및 35℃, 압력을 1600 bar까지 변화시켜 가면서 측정하였으며, 이때의 반응속도상수는 온도와 압력에 따라 증가함을 알았다. 이 반응속도상수로부터 △V≠, △β≠, △H≠ 및 △S≠의 값을 얻었으며, 이들 값으로부터 전이상태의 용매구조 변화 및 메카니즘을 규명하였다. 이러한 사실로부터 본 반응은 SF2 메카니즘이 지배적이며 압력이 증가함에 따라 SF2의 성격이 약화됨을 알았다. Ultraviolet spectrophotometric investigation has been carried out on the system of charge-transfer(CT) complex with iodine and tetramethyltin in n-hexane and acetone. From these results, the transient CT absorption spectrum can be observed and the subsequent disappearance of CT absorption spectrum is accompained by the cleavage of tetramethyltin with iodine (iododestannylation). Therefore, the rate constants for the iododestannylation were determined at 10, 25 and 35℃ up to 1600 bar and the rates of reaction were increased with increasing temperature and pressure. From these rate constants, the values of the activation parameters (△V≠, △β≠, △H≠ and △S≠) were obtained and discussed in terms of solvent structure variation of transition state and mechanism from these values. It could postulated that the reaction is followed with SF2 mechanism and weakened SF2 mechanism nature by increasing pressure.

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  Cite this article

[IEEE Style]

O. C. Kwun, J. B. Kyong, Y. H. Lee, "The Effect of Pressure on the SF2 Cleavage Reaction of Tetramethyltin with Iodine," Journal of the Korean Chemical Society, vol. 37, no. 3, pp. 287-293, 1993. DOI: .

[ACM Style]

Oh Cheun Kwun, Jin Burm Kyong, and Young Hoon Lee. 1993. The Effect of Pressure on the SF2 Cleavage Reaction of Tetramethyltin with Iodine. Journal of the Korean Chemical Society, 37, 3, (1993), 287-293. DOI: .

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