HYDROLYSIS OF P-NITROPHENYL PICOLINATE CATALYZED BY COPPER(II ) COMPLEXES OF LONG ALKYL-PYRIDINES WITH HYDROXYL GROUPS IN MICELLAR SOLUTION
作者:
ZENG XIANCHENG,
CHENG SIQING,
YU XIAOQI,
HUANG ZHONG,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 1999)
卷期:
Volume 20,
issue 6
页码: 1581-1593
ISSN:0193-2691
年代: 1999
DOI:10.1080/01932699908943874
出版商: Taylor & Francis Group
关键词: Metallomicelle;Hydrolysis of PNPP;Catalysis;Pyridine ligands
数据来源: Taylor
摘要:
A ternary complex kinetic model for metallomicellar catalysis has been proposed in this paper. Hydrolysis of PNPP influenced by Co-micelles of long alkyl-pHridines with hydroxyl groups and CTAB was investigated in aqueous buffers of pH ranging from 5. 0 to 7. 0 at 30°C at present of Cu2+. The kinetic and the thermodynamic parameters (Kn', Km', KT) were obtained by the kinetic analyses,moreover,the rate constant Knin metallomi-cellar phase was obtained. The pKϵs of the hydroxyl groups of these complexes were determined to be 5. 62,5. 53,5. 34,5. 32,respectively by analyses of pH-rate profiles. The results indicate that pyridine ligands exhibit a great catalysis on the hydrolysis of PNPP,which increases with increasing the hydrocarbon chain length.
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