化学学报 ›› 1999, Vol. 57 ›› Issue (6): 616-621. 上一篇    下一篇

研究论文

配合物Zn(II)-BPHA的^1H NMR谱

刘国正;刘飞;王翌善;缪增星;方吉东   

  1. 中国原子能科学研究院同位素所
  • 发布日期:1999-06-15

^1H NMR spectra of complex Zn(II)-BPHA

Liu Guozheng;Liu Fei;Wang Yishan;Miao Zengxing;Fang Jidong   

  • Published:1999-06-15

测定了各pD值下BPHA[BPHA是N,N'-bis(2-aminoethyl)-1,3-propanediaminehexaaceticacid的简称,中文名称为二胺乙基丙二胺六乙酸]和Zn^2^+-BPHA的^1HNMR谱。BPHA两端羧甲基上亚甲基质子的化学位移δ~a和中间羧甲基上亚甲基质子的化学位移δ~b随pD值交替变化。Zn^2^+-BPHA的^1HNMR谱有3种情况:pD<6,对应Zn(II)-H~2BPHA^4^-,有一特征尖峰,显示自由-NH^+(CH~2COO^-)~2残基存在;pD=6-9,对应Zn(II)-HBPHA^5^-,该峰消失,显示4个胺基全部配位;pD>9,对应Zn(II)-BPHA^6^-,该峰再次出现,1个N(CH~2COO^-)~2脱离配位体系。在3种形态的配合物中,Zn-N键都是非活性的,Zn-O键在后两种形态配合物中是非活性的。

关键词: 锌络合物, 质子磁共振谱法, 二胺乙基丙二胺六乙酸, 丙二胺P, 乙酸P

The ^1H NMR spectra of BPHA and Zn(II)-BPHA have been determined in the pD range 0.8-12.4. In contrast to DTPA and TTHA, the chemical shifts of the methylene protons a in the terminal carboxymethyl groups and b in the middle carboxymethyl groups of BPHA change alternatively with the increasing pD value. For Zn(II)-BPHA, there are three kinds of ^H NMR spectra. In the range pD<6, there exists a sharp peak characteristic of a free NH^+(CH~2COO^-)~2 moiety. From 6 to 9, no sharp single peak exists indicating all nitrogen atoms are coordinated; After pD>9, a sharp single peak appears at 3.14 indicating that an iminodiacetate group is again free except the nitrogen is not protonized.

Key words: ZINC COMPLEX, PROTON MAGNETIC RESONANCE SPECTROMETRY, PROPANEDIAMINE P, ACETIC ACID P

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