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Volumn 14, Issue 1, 2011, Pages 184-188

Ester catalytic hydrolysis by a tridentate N,N′,N″-copper bridged cyclodextrin dimer

Author keywords

Copper complex; Cyclodextrin dimer; Ester; Hydrolysis; Kinetics

Indexed keywords


EID: 78651268479     PISSN: 13877003     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.inoche.2010.10.018     Document Type: Article
Times cited : (14)

References (51)
  • 40
    • 78651272248 scopus 로고    scopus 로고
    • note
    • 2: C, 35.63; H, 6.41; N, 1.37. Found: C, 35.23; H, 5.94; N 1.48.
  • 41
    • 78651326947 scopus 로고    scopus 로고
    • note
    • Potentiometric pH Titration: An automatic titrator (Metrohm 702GPD Titrino) coupled to a Metrohm electrode was used and calibrated according to the Gran method. The electrode system was calibrated with buffers and checked by titration of HClO4 with NaOH solution (0.10 M). The thermostated cell contained 25 mL of 1.00 mM species in aqueous solutions with the ionic strength maintained at 0.10 M by sodium perchlorate. All titrations were carried out in the aqueous solutions under argon atmosphere at (25 ± 0.1) °C, and initiated by adding fixed volumes of 0.10 M standard NaOH in small increments to the titrated solution. Duplicate measurements were performed, for which the experimental error was below 1%. The titration data were fitted from the raw data with the Hyperquad 2000 program to calculate the ligand protonation constants Kn, the complex formation constant KML, and the deprotonation constants of the coordinated water pKa.
  • 43
    • 78651301499 scopus 로고    scopus 로고
    • note
    • 3CN solution at an appropriate pH were mixed, the UV absorption decay was recorded immediately and was followed generally until 2% decay of 4-nitrophenyl acetate. Errors on kobs values were about 5%.
  • 46
    • 78651300819 scopus 로고    scopus 로고
    • note
    • The rate of hydrolysis of BNPP to give mono(4-nitrophenyl)phosphate and 4-nitrophenolate was measured by an initial slope method following the increase in the 400 nm absorption of the released 4-nitrophenolate in aqueous solution at (35 ± 0.1) °C. The second-order rate constants (kBNPP) for the catalyzed reactions were determined as the slope of the linear plots of kin versus CuL concentration. To correct the spontaneous cleavage of BNPP, each reaction was measured against a reference cell that was identical to the sample cell in composition except for the absence of CuL. Errors on kBNPP values were about 5%.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.