An anionic surfactant metallomicelle: catalytic activity and mechanism for the catalytic hydrolysis of a phosphate ester. (1st September 2014)

• Record Type: Journal Article
• Authors: Yu, Lan; Xie, Jia-qing; Li, Fan-zhen
• Is Part Of: Progress in reaction kinetics and mechanism. Volume 39:Number 3(2014)
• Page Start: 262
• Page End: 272
• Publication Date: 2014-09-01
• Subjects: Chemical kinetics -- Periodicals; 541.39405
• DOI: 10.3184/146867814X13981545065099
• Languages: English
• ISSNs: 1468-6783

Abstract

An aza-crown ether ligand was synthesised and characterised. The chemical composition of the binary complex containing cerium(III) and the ligand was determined by fluorescence spectroscopy. A new metallomicellar system comprising the cerium(III) complex of the ligand and an anionic micelle (n-lauroylsarcosine) was used as catalyst in the hydrolysis of bis(4-nitrophenyl) phosphate ester (BNPP). The catalytic rate of BNPP hydrolysis and the local concentration effect of the micelle were measured kinetically using UV-Vis spectrophotometry. The results indicated, that compared with a cationic metallomicelle system made from the aza-crown ether, lanthanum(III) ion and CTAB cationic surfactant in our previous report, the anionic metallomicelle exhibited a six-fold higher catalytic activity in BNPP hydrolysis at neutral pH and the same other conditions, thus the micelle based on LSS provides a more effective catalytic environment for reaction. A reaction mechanism has been proposed.