Saleh M I, Ahmad M, Darus H
School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia.
Talanta. 1990 Jul;37(7):757-9. doi: 10.1016/0039-9140(90)80108-r.
A series of chelating reagents, 1-phenyl-3-methyl-4-(2-fluorobenzoyl)-5-pyrazolone, 1-phenyl-3-methyl-4-(3-fluorobenzoyl)-5-pyrazolone and 1-phenyl-3-methyl-4-(4-fluorobenzoyl)-5-pyrazolone, has been synthesized. The extraction of Ln(III), (Ln = La, Eu and Lu) into chloroform with these reagents at 30 +/- 1 degrees has been studied. The composition of the complexes extracted has been determined by the slope method, and the extraction constants K(ex), were measured. The presence of the fluorine atom in the reagents does not make the K(ex), values much different from those obtained with the parent pyrazolone.
已经合成了一系列螯合试剂，即1-苯基-3-甲基-4-(2-氟苯甲酰基)-5-吡唑啉酮、1-苯基-3-甲基-4-(3-氟苯甲酰基)-5-吡唑啉酮和1-苯基-3-甲基-4-(4-氟苯甲酰基)-5-吡唑啉酮。研究了在30±1℃下用这些试剂将Ln(III)（Ln = La、Eu和Lu）萃取到氯仿中的情况。通过斜率法确定了萃取的配合物的组成，并测量了萃取常数K(ex)。试剂中氟原子的存在并没有使K(ex)值与母体吡唑啉酮获得的值有太大差异。
