Modulation of the Lifetime of Water Bound to Lanthanide Metal Ions in Complexes with Ligands Derived from 1,4,7,10-Tetraazacyclododecane Tetraacetate (DOTA)
作者:Shanrong Zhang、Xiuyan Jiang、A. Dean Sherry
DOI:10.1002/hlca.200590086
日期:2005.5
tetraamide derivatives of DOTA were synthesized, and their lanthanide(III) complexes were examined by multinuclear 1H-, 13C-, and 17O-NMR spectroscopy, and compared with literature data of similar, known complexes (Table). All ligands formed structures similar to the parent [LnIII(DOTA)]− complexes, with four N-atoms and four O-atoms from DOTA and one O-atom from the inner-sphere water molecules. Interestingly
合成了一系列DOTA的二酰胺和四酰胺衍生物,并通过多核1 H-,13 C-和17 O-NMR光谱检查了它们的镧系元素(III)配合物,并与相似的已知配合物的文献数据进行了比较(表)。所有配体形成类似于母体[Ln III(DOTA)] -配合物的结构,其中DOTA带有四个N原子和四个O原子,内圈水分子带有一个O原子。有趣的是,寿命τ中号的内球面的,金属结合的水分子广泛地变化,范围从纳米到毫秒,这取决于悬垂酰胺侧链的身份。通常,带正电的[LnIII(DOTA-四酰胺)] 3+络合物显示最长的停留时间(高τ中号的值),而在扩展酰胺与另外的带电官能团的复合物显示小得多的τ中号值,即使当侧基不直接协调,以中心的Ln 3+离子。新颖的设计[LN III(DOTA-四酰胺)] 3+配合物的宽,调谐范围τ中号值是最重要的用于快速响应的,顺磁性化学交换饱和转移(PARACEST)成像的应用用于研究生理和代谢过程的药物。