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用pH电位法研究了1-乙酰胺基丙叉-1,1-二膦酸(S-186)和1-丙酰胺基乙叉-1,1-二膦酸(S-106)与碱土金属的螯合作用(30±O.1℃).当金属离子与配体的摩尔浓度比为10∶1、1∶1和1∶2时,在水溶液中形成了MHL、ML、ML_2和M_2L等几种类型的配合物.分别测定了它们的稳定常数,其中S-186配合物稍高于S-106,说明配合物稳定性与螯合剂的碱度有平行关系.值得注意的是,这两种螯合剂与Sr~(2+)形成的双核配合物的稳定性均较其它碱土金属离子的为高.
The effects of 1-acetamidopropylidene-1,1-diphosphonic acid (S-186) and 1-propionamidoethylidene-1,1-diphosphonic acid (S-106) (30 ± 0.1 ℃). When the molar ratio of metal ions to ligand is 10: 1, 1: 1 and 1: 2, MHL, ML, ML_2 and M_2L etc. are formed in aqueous solution Several types of complexes were measured for their stability constants, respectively, of which the S-186 complex is slightly higher than S-106, indicating that the stability of the complex has a parallel relationship with the alkalinity of the chelating agent.It is worth noting that these two The stability of the binuclear complex formed by the chelating agent and Sr2 + is higher than that of other alkaline earth metal ions.