1,9-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)壬二酮-[1,9]与1,10-菲绕啉,2,2′-联吡啶对镧(Ⅲ)的协同萃取

Synergistic Extraction of Lanthanum with 1,9-Bis (1' -Phenyl-3' -Methyl-5' -Oxopyrazol-4' -yl) -1,9-Nonanedione and 1,10-Phenanthroline or 2,2'-Bipyridyl

研究了1,9-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)壬二酮-[1,9](H_2A)与1,10-菲绕啉(Phen)或2,2′-联吡啶(Bipy)从硝酸及硝酸与醋酸钠缓冲溶液中对La(Ⅱ)的协同萃取行为。用斜率法测定协萃合物的组成为LaA·HA·B(B为Phen或Bipy),求得了协萃平衡常数。用萃取法制得了固态萃合物,并对其组成、UV、IR、DTA—TG、~1HNMR进行了研究。讨论了协萃机理及萃合物的可能结构。

1, 9-bis( 1'-phenyl-3'-methyr-5'-oxopyrazol-4'-y1)-1 , 9-nonanedione (H2A) was one of a series of bis acyl pyrazolone chelate extractants synthesized recently. In this paper, single and synergistic extraction by H2A and 1,10-phenanthroline or 2,2'-bipyridyl(simplified as B) for lanthanum from aqueous nitric acid or nitric acid and sodium acetate buffer have been investigated, respectively. By using slope analysis method the formulas of the extracted complexes have shown to be LaA. HA.B and the extraction equlibrium constants have been calculated. The values of the equlibrium constants (1gβ281 ) of LaA.HA.B show large synergistic effect. The solid extracted complexes were isolated from the solution. The compounds were studied by elemental analysis,TG-DTA, UV, IR,1H NMR and the solubility in chloroform was determined.