Synthesis of 2, 6-Bis(1′-Phenyl-3′-Methyl-5′-Oxopyrazole-4′) Pyridinediacyl and Its Solid-Liquid Extraction Behavior for Ce(Ⅲ)
来源期刊：JOURNAL OF RARE EARTHS2002年第5期
论文作者：邓启良 彭波 康敬万 郭效军 高锦章
Key words：rare earths; synthesis; H2BPMPP; solid-liquid extraction; cerium(Ⅲ);
Abstract: β-diketone type chelating ligands have high coordinative activity and selectivity, and are widely applied in analytical chemistry. In order to obtain profounder understanding to the properties of bis(4-acylpyrazolone-5), A new 4-acylpyrazol-5-one derivative (H2BPMPP) was syntheszed, which contains a heterocyclic ring between two 1-phenyl-3-methyl-4-acylpyrazol-5-one rings. The new compound was characterized by element analyses, UV, IR and 1H NMR spectra. The equilibrium of the keto-enol tautomerism was studied. The results show that a lower dielectric constant of solvent favors the enol form which has a higher λmax. Due to special merits of paraffin wax, the solid-liquid extraction behavior of Ce(Ⅲ) with molten paraffin wax as a diluent was also investigated at higher temperature. The value of the pH1/2 was 3.19 and the value of logKex was 3.467. The chemical composition of the complex was obtained by the slope analysis method.
邓启良1，彭波1，康敬万1，郭效军1，高锦章1
(1.Chemistry & Chemical Engineering College, Northwest Normal University, Lanzhou 730070, China;
2.Department of Fundamental Science, Tianjin Light Industry Institute, Tianjin 300222, China)
Abstract:β-diketone type chelating ligands have high coordinative activity and selectivity, and are widely applied in analytical chemistry. In order to obtain profounder understanding to the properties of bis(4-acylpyrazolone-5), A new 4-acylpyrazol-5-one derivative (H2BPMPP) was syntheszed, which contains a heterocyclic ring between two 1-phenyl-3-methyl-4-acylpyrazol-5-one rings. The new compound was characterized by element analyses, UV, IR and 1H NMR spectra. The equilibrium of the keto-enol tautomerism was studied. The results show that a lower dielectric constant of solvent favors the enol form which has a higher λmax. Due to special merits of paraffin wax, the solid-liquid extraction behavior of Ce(Ⅲ) with molten paraffin wax as a diluent was also investigated at higher temperature. The value of the pH1/2 was 3.19 and the value of logKex was 3.467. The chemical composition of the complex was obtained by the slope analysis method.
Key words:rare earths; synthesis; H2BPMPP; solid-liquid extraction; cerium(Ⅲ);
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