N-甲基甲异羟肟酸的合成及其与Np(Ⅳ)、Pu(Ⅳ)配合物稳定常数的测定

Synthesis of N-Methylformohydroxamic Acid and Determination of Stability Constants of Its Complexes With Pu(Ⅳ) and Np(Ⅳ)

摘要: 以甲酸乙酯和N-甲基盐酸羟胺为主要原料，在乙醇-水体系中合成N-甲基甲异羟肟酸（NMFHA），并通过元素分析、红外光谱、质谱分析和核磁共振波谱等方法对其结构进行表征。TTA萃取法测定结果表明，在1.0 mol/L HNO₃体系中，Np(Ⅳ)、Pu(Ⅳ)与NMFHA形成稳定的1∶2的配合物，其累积稳定常数分别为：β₁(Np(Ⅳ))＝8.83×10⁹，β₂(Np(Ⅳ))＝1.01×10¹⁹；β₁(Pu(Ⅳ))=7.78×10¹⁰，β₂(Pu(Ⅳ))＝5.80×10¹⁹。

Abstract: The title compound N-methylformohydroxamic acid (NMFHA) was synthesized by the reaction of N-methyl hydroxylamine hydrochloride with ethyl formate in alcohol medium. It was also characterized by element analysis, IR spectrum, mass spectrum and NMR spectrum. In 1.0 mol/L HNO3 solution, stable 1∶2 complexes of NMFHA complexes with Np(Ⅳ) or Pu(Ⅳ) were determined by TTA extraction method, and the stability constants are β₁(Np(Ⅳ))＝8.83×10 ⁹, β₂(Np(Ⅳ))＝1.01×10¹⁹, and β₁(Pu(Ⅳ))＝7.78×10¹⁰, β₂(Pu(Ⅳ))＝5.80×10¹⁹, respectively.