This study is mainly focused on micellar effect of tetradecyltrimethyl ammonium bromide(TTABr) solution including alkylbenzimidazole(R-BI) on dephosphorylation of diphenyl-4-nitrophenylphosphinate(DPNPIN) in carbonate buffer(pH 10.7). Dephosphorylation of DPNPIN is accelerated by BI⊖ ion in 10-2 M Carbonate buffer(pH 10.7) of 4×10-4 M TTABr solution up to 80 times as compared with the reaction in Carbonate buffer by no benzimidazole(BI) solution of TTABr. The value of pseudo first order rate constant(kψ) of the reaction in TTABr solution reached a maximum rate constant increasing micelle concentration. The reaction mediated by R-BI⊖ in micellar solutions are obviously slower than those by BI⊖, and the reaction rate were decreased with increase of lengths of alkyl groups. It seems due to steric effect of alkyl groups of R-BI⊖ in Stern layer of micellar solution. The surfactant reagent, TTABr, strongly catalyzes the reaction of DPNPIN with R-BI and its anion(R-BI⊖) in Carbonate buffer(pH 10.7). For example, 4×10-4 M TTABr in 1×10-4 M BI solution increase the rate constant(kψ=99.7×10-4 1/sec) of the dephosphorylation by a factor ca. 28, when compared with reaction(kψ=3.5×10-4 1/sec) in BI solution(without TTABr). And no TTABr solution, in BI solution increase the rate constant(kψ=3.5×10-4 1/sec) of the dephosphorylation by a factor ca. 39, when compared with reaction (kψ=1.0×10-5 1/sec) in water solution(without BI).

Abstract
 1. 서 론
 2. 재료 및 실험방법
  2.1. 시약 및 기기
  2.2. Alkylbenzimidazole(R-BI)의 해리상수(Ka)값과CTABr과의 결합상수(Ks)의 측정
  2.3. TTABr 용액속에서 alkylbenzimidazole에 의해추진되는 DPNPIN의 탈인산화반응의 속도상수(kψ)결정
 3. 결과 및 고찰
  3.1. TTABr 미셀 수용액에서의 2-alkylbenzimidazole의Ka 값과 결합상수(Ks) 값
  3.2. TTABr 미셀 유사층 내에서의 R-BI⊖의 농도
  3.3. TTABr 미셀 용액내에서 R-BI⊖에 의한 탈인산화반응의유사일차속도상수,
kψ (1/sec)
  3.4. 1차 반응속도에 미치는 친핵체인 R-BI⊖ 농도의 영향
  3.5. 2차 반응속도에 미치는 친핵체인 R-BI⊖ 농도의 영향
 4. 결 론
 REFERENCE

• 김정배(계명대학교 환경학부 지구환경학과) | Jeung-Bea Kim (Faculty of Environmental Studies, Keimyung University) Corresponding author