HPMBP与TOPO协萃钯(Ⅱ)的机理研究

STUDY ON THE SYNERGISTIC EXTRACTION MECHANISM OF PALLADIUM WITH HPMBP AND TOPO

本文研究了HPMBP与TOPO的氯仿溶液从硝酸介质中协萃钯(Ⅱ)的机理。用斜率法和等摩尔系列法确定协萃配合物的组成为Pd(PMBP)_2·2TOPO,测得协萃反应的平衡常数1gK_(12)=4.35,协萃配合物的生成常数1gβ_(12)=3.90,该反应的△H=-16.5kJ·mol^(-1),△G^0=-25.2kJ·mol^(-1),△S=28.9J·mol^(-1)·K^(-1)。

The mechanism of synergistic extraction of Pd(II) with HPMBP and TOPO from nitric acid solution has been studied. The synergistic extraction coefficient of Pd(II) is 20.7. The composition of the synergically extracted complex is Pd(PMBP)3 2TOPO as determined by the methods of slope and the constant mole. The synergistic extraction reaction and additional reaction of Pd(II) have been proposed as follows: Pd2+(2)+2HPMBP(o)+2TOPO(o) - Pd(PMBP)2 2TOPO(o)+2H + (o) Pd(PMBP)2(o)+2TOPO(o) = Pd(PMBP)2 TOPO(o) In addition, the equilibrium constant and the thermodynamic functions of the synergistic extraction reaction have been calculated.