Reactivity of some sugars and sugar phosphates towards gold(III) in sodium acetate–acetic acid buffer medium
作者:Kalyan Kali Sen Gupta、Biswajit Pal、Bilkis Ara Begum
DOI:10.1016/s0008-6215(00)00181-6
日期:2001.1
The kinetics of the oxidation of some aldoses and aldose phosphates have been studied spectrophotometrically in sodium acetate-acetic acid buffer medium at different temperatures. The reactions are first order with respect to [Au(III)] and [substrate]. Both H+ and Cl- ions retard the reaction. The reactions appear to involve different gold(III) species, viz. AuCl4-, AuCl3(OH2) and AuCl3(OH)- . The
已经在不同温度下在乙酸钠-乙酸缓冲液中分光光度法研究了某些醛糖和醛糖磷酸的氧化动力学。对于[Au(III)]和[底物],反应是一阶的。H +和Cl-离子均会延迟反应。反应似乎涉及不同的金(III)物种,即。AuCl4-,AuCl3(OH2)和AuCl3(OH)-。根据自由基和Au(II)可能的中间形成来解释结果。醛糖与金(III)的反应顺序为:三糖>蔗糖>戊糖>己糖。磷酸糖与金(III)的反应速度比母糖快,但葡萄糖-1-磷酸的反应速度比葡萄糖慢。已经提出了导致产物形成的初步反应机理。