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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 35, Number 4
JKCSEZ 35(4)
August 20, 1991

Title	The Study of Rates of Substitution Reaction [Pd(ONN)Cl] ＋ Y- ↔ [Pd(ONN)Y] ＋ Cl- (Y = SCN-, CN-, N3-, Imidazole, Pyridine [Pd(ONN)Cl] 착물의 SCN-, CN-, N3-, Imidazole, Pyridine에 대한 치환반응 속도연구 (제 1 보)
Author	Sang-Oh oh, Hwan Jin Yeo, Iee Yeung Cho 오상오, 여환진, 조이영
Keywords
Abstract	친핵치환반응 ([Pd(ONN)Cl] ＋ Y- ↔ [Pd(ONN)Y] ＋ Cl- (Y = SCN-, CN-, N3-, imidazole, pyridine)속도를 25 ∼ 45℃ 범위에서 분광광도법으로 측정하였다. 친핵체의 반응성상수, npd°를 계산했으며 그 값은 CN- > SCN- > N3- > Imidazole > Pyridine이 순서였다. 활성화엔탈피(△H≠)는 작은 양(+)의 값을, 활성화엔트로피(△S≠)는 큰 음(-)의 값을 가졌다. 이 결과로 보아 이 착물의 친핵 치환반응은 회합(A) 메카니즘으로 진행됨을 알 수 있었다. Rates of nucleophilic substitution reaction ([Pd(ONN)Cl] ＋ Y- ↔ [Pd(ONN)Y] ＋ Cl- (Y = SCN-, CN-, N3-, imidazole, pyridine) have been measured in methanol by spectrophotometric method at various temperatures. A set of nucleophilic reactivity constants, npd° has been calculated. These values show an order of nucleophilicity CN- > SCN- > N3- > Imidazole > Pyridine. The enthalpy of activation are small positive values and the entropy of activation are large negative values. From these results, it can be inferred that the nucleophilic substitution reaction proceeds through an associative (A) mechanism.
Page	362 - 367
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