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一、前言 1,9-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)壬二酮-[1,9] (简称H_2A)为新近合成的一种双-β二酮螯合剂,它较HPMBP类试剂多一倍螯合功能团,不但能与钍(Ⅳ)形成较稳定的可萃络合物,而且还能与某些中性萃取剂产生协萃作用。本文以氯仿为溶剂研究了它对钍(Ⅳ)的单独萃取及它与三辛基氧膦(TOPO)协同萃取钍的作用,测得了萃合物的组成为ThA_2·TOPO。求得单独萃取和协同萃取反应的平衡常数分别为β_(20)=1.03×10~8和β_(21)=1.18×10~9。
I. INTRODUCTION The synthesis of 1,9-bis (1’-phenyl-3’-methyl-5’-oxopyrazol-4’-yl) nonadione [1, 9] Of a double-β diketone chelating agent, which than the HPMBP class reagents double chelating functional groups, not only thorium (Ⅳ) to form a more stable extractable complexes, but also with some neutral extraction Synergistic effect of agents. In this paper, the extraction of thorium (Ⅳ) and the synergistic extraction of thorium with trioctylphosphine oxide (TOPO) were studied using chloroform as solvent. The composition of the extract was determined to be ThA 2 · TOPO. The equilibrium constants obtained by single extraction and synergistic extraction were β_ (20) = 1.03 × 10 ~ 8 and β_ (21) = 1.18 × 10 ~ 9, respectively.