N,N′-双(N,N-二羧甲氨基)乙二胺的合成和性质

SYNTHESIS AND CHARACTERISTICS OF N,N′ BIS (N,N DICARBOXYLIC METHYLAMINO) ETHYLENEDIAMINE

合成了一种新的多元氨羧酸化合物：Ｎ，Ｎ′－双（Ｎ，Ｎ－二羧甲氨基）乙二胺（简称ＢＤＥＤ），在元素分析、红外光谱、质谱、电子光谱及ｐＨ电位滴定的基础上讨论了它的性质．用Ｂｊｅｒｒｕｍ法求出它的各级离解常数的对数分别为：ｌｇＫａ１＝－２．９２，ｌｇＫａ２＝－３．５１，ｌｇＫａ３＝－６．５７，ｌｇＫａ４＝－７．４５，并进行了直接代数近似计算，最后进行了Ｃｕ２＋－ＢＤＥＤ水溶液体系的电位滴定研究．

A new polyaminocarboxylic acid (BDED) was synthesized and characterized on the basis of elemental analysis, IR, MS, electron spectra and pH potentiometric procedures. According to Bjerrum method, dissociation constants of BDED were determined to be lg K a 1 =-2 92, lg K a 2 =-3 51, lg K a 3 =-6 57, and lg K a 4 =-7 45. And a direct algebraic method was also used to calculate the dissociation constants. The systems of Cu 2+ BDED agueous solution were investigated by potentiometer titration.