摘要
用ＮＭＲ方法研究了氨三乙氧基乙酸（ＮＴＥＡ）的质子解离过程及其与Ｌａ３＋、Ｙ３＋、Ｌｕ３＋和Ｃａ２＋的配合作用．ＮＴＥＡ的氮原子和羧基的质子解离常数分别为８．８和３．０．当ｐＨ＞３．０时，Ｌａ３＋、Ｙ３＋和Ｌｕ３＋配合物能稳定形成（＞５０％），而Ｃａ２＋配合物则需出＞５．在ｐＨ３～６范围内，配合物与配体间的交换反应处于慢－中介交换速率区间，通过变温谱模拟得到了其交换反应的动力学参数．
he proton dissociation proccsses of nitrilotricthanolacctate acid (NTEA) and its complexes with La3+, Y3+, Lu3+ and Ca2+ had been studied by using NMR spectroscopy. The proton dissociation constants arc 8.8 and 3.0 for amino and carboxyls respectively. The suitable pH range for complex formations is PH > 3 for La3+, Y3+ and Lu3+, while is PH > 5 for Ca2+. The intermolccular ligand exchanges are in the range of slow to intermediate rates on 400MHzNMR time seale, which kinetic parameters are obtained by the simulations of VT 1H NMR spectra
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1995年第4期351-354,共4页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金
关键词
NMR
氨三乙氧基乙酸
配合物
稀土
钙
NMR
nitrilotriethanolacetate acid
La￣(3+)
Y￣(3+)
Lu￣(3+)
Ca￣(2+)
