4-Nitrophenyl Acetate Hydrolysis Catalyzed by Cu(Ê) and Zn(Ê) Complexes of Linear Oxa-Aza Polydentate Amino Alcoholic Phenol Ligands

Abstract

Abstract: The kinetics of p-nitrophenyl acetate(NA) hydrolysis catalyzed by Cu(Ê) complexes of ligands N,NØ-bis-(2-hydroxyethyl)-ethylenediamine(L₁) and N-(2-hydroxybenzyl)-3-amino-propan-1-ol(HL₂) and Zn(Ê) complexes of ligands N-(2-hydroxyethyl)-NØ-(2-hydroxybenzyl)-ethylenediamine(HL₃) and 3,6,9-triaza-1-nonanol(L₄) was determined spectrophotometrically at (25±0.1) ℃ and I=0.10 mol/L KNO₃ in U(CH₃CN)=10% at pH 6.5—9.0(50 mmol/Lbuffers), and the second-rate constants k_C for the catalysis of NAester hydrolysis were obtained. The experimental results indicate that coordinated alkoxides Cu(Ê)… ^-ORand Zn(Ê)… ^-ORyielded at neutral pHare strong nucleophiles, and the complexes have a strong ability to catalyze the hydrolysis of NAester following the double-catalysis mechanism, with k_C values of 6.72×10^-2, 0.126 , 4.55×10^-2 and 7.66×10^-2 mol^-1·L·s^-1.

Key words: Oxa-aza ligands, Catalytic hydrolysis, Cu(Ê, ) complexes, Zn(Ê, ) complexes, Nucleophiles

CLC Number:

O614.12

TrendMD:

XIE Yong-Shu, YU Jun, LIN Rui-Sen, LIU Qing-Liang . 4-Nitrophenyl Acetate Hydrolysis Catalyzed by Cu(Ê) and Zn(Ê) Complexes of Linear Oxa-Aza Polydentate Amino Alcoholic Phenol Ligands[J]. Chem. J. Chinese Universities, 2000, 21(9): 1441.

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4-Nitrophenyl Acetate Hydrolysis Catalyzed by Cu(Ê) and Zn(Ê) Complexes of Linear Oxa-Aza Polydentate Amino Alcoholic Phenol Ligands

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