Tris(phosphonomethyl)cyclen Derivatives: Thermodynamic Stability, Kinetics, Solution Structure, and Relaxivity of Ln
<sup>3+</sup>
Complexes
作者:Luís M. P. Lima、Rita Delgado、Petr Hermann、Radek Ševčík、Přemysl Lubal、Henrique F. Carvalho、André F. Martins、Éva Tóth、Carlos F. G. C. Geraldes
DOI:10.1002/ejic.201101335
日期:2012.5
contribution from second-sphere water molecules to the relaxivity of all the Gd3+ complexes studied. The 1H and 31P NMR spectra of the Eu3+, Yb3+ and Lu3+ complexes showed that the propionate arm in the [Ln(do3p1pr)]4 complexes and the propanol arm in the [Ln(do3p1ol)]3 complexes are not bound to the Ln3+ ion. The [Ln(do3p)]3 and [Ln(do3p1pr)]4 complexes have a clear preference for the TSAP (twisted square
研究了含有三个甲基膦酸悬垂臂的三个基于环烯的配体的镧系元素 (Ln3+) 配合物,配体为 1,4,7,10-四氮杂环十二烷-1,4,7-三基三(甲基膦酸)(H6do3p),3- [4,7,10-三(膦酰基甲基)-1,4,7,10-四氮杂环十二烷-1-基]丙酸(H7do3p1pr)和10-(3-羟丙基)-1,4,7,10-四氮杂环十二烷-1,4,7-三基三(甲基膦酸)(H6do3p1ol)。三个大环配体与所有研究的 Ln3+ 离子形成具有非常高热力学稳定性的复合物。动力学研究表明,这些配体的 Ce3+ 配合物的酸辅助解离比相关配体 H8dotp [1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayltetrakis(methyl phosphonic酸)]。对于 do3p1ol 配体,与 Eu3+ 和 Gd3+ 复合物配位的水分子数量估计 < 1,但大约为