Synthesis of a bifunctional monophosphinic acid DOTA analogue ligand and its lanthanide(<scp>iii</scp>) complexes. A gadolinium(<scp>iii</scp>) complex endowed with an optimal water exchange rate for MRI applications
作者:Jakub Rudovský、Jan Kotek、Petr Hermann、Ivan Lukeš、Valentina Mainero、Silvio Aime
DOI:10.1039/b410103k
日期:——
A new bifunctional octa-coordinating ligand containing an aminobenzyl moiety, DO3APABn (H4DO3APABn = 1,4,7,10-tetraazacyclododecane-4,7,10-triacetic-1-methyl[(4-aminophenyl)methyl]phosphinic acid}), has been synthesized. Its lanthanide(III) complexes contain one water molecule in the first coordination sphere. The high-resolution 1H and 31P spectra of [Eu(H2O) (DO3APABn)]− show that the twisted square-antiprismatic form of the complexes is more abundant in respect to the corresponding Eu(III)–DOTA complex. The 1H NMRD and variable-temperature 17O relaxation measurements of [Gd(H2O)(DO3APABn)]− show that the water residence time is short (298τM = 16 ns) and falls into the optimal range predicted by theory for the attainment of high relaxivities once this complex would be endowed by a slow tumbling rate. The relaxivity (298r1 = 6.7 mM−1 s−1 at 10 MHz) is higher than expected as a consequence of a significant contribution from the second hydration sphere. These results prompt the use of [Gd(H2O)(DO3APABn)]− as a building block for the set-up of highly efficient macromolecular MRI contrast agents.
一种新的双功能八配位配体,含有氨基苄基部分,DO3APABn(H4DO3APABn = 1,4,7,10-四氮杂环十二烷-4,7,10-三乙酸-1-甲基[ (4-氨基苯基)甲基]膦酸}),已被合成。其铈(III)络合物在第一配位球中含有一个水分子。 [Eu(H2O)(DO3APABn)]−的高分辨率1H和31P谱显示,与相应的Eu(III)–DOTA络合物相比,扭曲的方形反棱柱形态的络合物更为丰富。 [Gd(H2O)(DO3APABn)]−的1H NMRD和可变温度17O弛豫测量表明,水的驻留时间较短(298τM = 16 ns),并且进入了理论预测的高弛豫率实现的最佳范围,一旦该络合物被赋予缓慢的转动速率。弛豫率(298r1 = 6.7 mM−1 s−1在10 MHz)高于预期,这是由于第二水合球的显著贡献。这些结果促使将[Gd(H2O)(DO3APABn)]−用作构建高效大分子MRI对比剂的基础。