A Chromatographic Study of the Acidic Hydrolysis of<i>cyclo</i>-Hexa- and<i>cyclo</i>-Octaphosphate
作者:Genichiro Kura
DOI:10.1246/bcsj.56.3769
日期:1983.12
The hydrolysis rate of inorganic cyclo-hexa- and cyclo-octaphosphate in 0.1 mol dm−3 HCl was determined by means of anion-exchange chromatography. The phosphorus content in the column effluent was determined automatically by the use of the MoV–MoVI reagent. The hydrolysis reactions were first-order. The rate constant decreases from cyclo- tri- to cyclo-hexaphosphate with the increased ring, however, that of cyclo-octaphosphate increases again. This increase is thought to be due to the stronger proton affinity of cyclo-octaphosphate. The Arrhenius activation energies for cyclo-hexa- and cyclo-octaphosphate hydrolysis were 91.5 and 96.9 kJ mol−1 respectively.
通过阴离子交换色谱法测定0.1 mol dm−3 HCl中无机环己基和环辛基磷酸盐的水解速率。使用MoV-MoVI试剂自动测定色谱柱流出液中的磷含量。水解反应为一阶反应。环己基磷酸盐的水解速率常数随着环数的增加而降低,然而环辛基磷酸盐的水解速率常数又再次增加。这种增加被认为是由于环辛基磷酸盐具有更强的质子亲和力。环己基和环辛基磷酸盐水解的阿列纽斯活化能分别为91.5和96.9 kJ mol−1。