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合成了吡啶吡唑基配体C8-BPP[2,6-bis(5-(n-octyl)-1H-pyrazol-3-yl)pyridine],并采用红外光谱、核磁共振波谱、质谱等手段对其进行了表征.以正十二烷为稀释剂,2-溴己酸为协萃剂,研究了C8-BPP从HNO3溶液中萃取Am~(3+)和Eu~(3+)的行为.重点考察了萃取时间、酸度和萃取剂浓度等对分配比D和分离因子SF_(Am/Eu)的影响.在HNO3浓度为0.2~1.0 mol/L时,C8-BPP萃取Am~(3+)和Eu~(3+)的D值随HNO3浓度增加而减小,SF_(Am/Eu)值先增大后减小;HNO3浓度为0.5 mol/L时,SF_(Am/Eu)达到55.随着配体浓度的增加,C8-BPP萃取Am~(3+)和Eu~(3+)的D值均增加,SF_(Am/Eu)值缓慢减小,但仍在40以上.斜率分析表明,C8-BPP萃取Am~(3+)和Eu~(3+)均形成了1∶1型的萃合物.还采用紫外滴定、高分辨质谱、红外光谱、拉曼光谱和时间分辨荧光光谱等方法研究了C8-BPP与Eu~(3+)的配位化学行为,并得到了配合物的组成和稳定常数.
The pyridine-pyrazolyl ligand C8-BPP [2,6-bis (5- (n-octyl) -1H-pyrazol-3-yl) pyridine was synthesized and characterized by IR, 1HNMR and MS It was characterized by using n-dodecane as diluent and 2-bromohexanoic acid as co-solvent to study the extraction behavior of Am 3+ and Eu 3+ from HNO 3 solution by C8-BPP. The effects of extraction time, acidity and extractant concentration on the partition ratio (D) and separation factor SF Am (Am / Eu) were investigated emphatically.Under the condition of HNO3 concentration 0.2 ~ 1.0 mol / L, And the value of Eu 3+ decreases with the increase of HNO 3 concentration, while the value of SF Am / Eu firstly increases and then decreases. When the concentration of HNO 3 is 0.5 mol / L, the value of SF Am / Eu reaches 55. With the increase of ligand concentration, the D value of Am ~ (3+) and Eu ~ (3+) in C8-BPP increased and the value of SF_ (Am / Eu) decreased slowly but remained above 40. Slope analysis The results showed that the extraction of Am ~ (3+) and Eu ~ (3+) by C8-BPP all formed the 1: 1 type of complex.Ultraviolet titration, high resolution mass spectrometry, infrared spectroscopy, Raman spectroscopy and time-resolved fluorescence The coordination chemistry of C8-BPP with Eu ~ (3+) has been studied by means of UV-Vis spectroscopy, and the composition and stability constants have been obtained.