【摘 要】
：
The reaction behavior of forming the hetero-nuclear β-type chelates of rare earth ions (RE3+) with p-sulphoaminobromophosphonazo(BPA-pSN) in ClCH2COOH-CH3COONa
【机 构】
：
Department of Chemistry
【基金项目】
：
Gansu Province Educational Commission,China
论文部分内容阅读
The reaction behavior of forming the hetero-nuclear β-type chelates of rare earth ions (RE3+) with p-sulphoaminobromophosphonazo(BPA-pSN) in ClCH2COOH-CH3COONa buffer solutions were studied by a spectrophotometric method. The interaction of RE3+ with BPA-pSN, which can forms hetero-nuclear β-type chelates having composition ratio of RE1 (light rare earth):BPA-pSN:RE2(heavy rare earth ion)=1∶3∶1, is a first-order reaction. Meanwhile, BPA-pSN can only forms homo-nuclear β-type chelates with heavy rare earth ions, having a composition ratio of RE∶BPA-pSN=1∶2 and being a second-order reaction. The rate constants of forming homo-and hetero-nuclear β-type chelates were obtained and the mechanism of forming hetero-nuclear β-type chelates was proposed.
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