Synthesis of 2, 6-Bis（1＇-Phenyl-3＇-Methyl-5＇-Oxopyrazole-4＇） Pyridinediacyl and Its Solid-Liquid Extraction Behavior for Ce（III）
摘要
β-diketone type chelating ligands have high coordinative activity and selectivity, and are widely applied in analytical ehemistry. In order to obtain profounder understanding to the properties of bis(4-aeylpyrazolone-5), A new 4-aeylpyrazol-5-one derivative (H2BPMPP) was syntheszed, whieh eontains a heteroeyelie ring between two 1-phenyl-3-methyl-4-aeylpyrazol-5-one rings. The new compound was eharaeterized by element analyses, UV, IR and ^1H NMR speetra. The equilibrium of the keto-enol tautomerism was studied. The results show that a lower dieleetric constant of solvent favors the enol form whieh has a higher λmax.Due to speeial merits of paraffin wax, the solidliquid extraetion 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 ehemieal eomposition of the complex was obtained by the slope analysis method.