Gadolinium(<scp>iii</scp>) complexes of mono- and diethyl esters of monophosphonic acid analogue of DOTA as potential MRI contrast agents: solution structures and relaxometric studies
作者:Petra Lebdušková、Petr Hermann、Lothar Helm、Éva Tóth、Jan Kotek、Koen Binnemans、Jakub Rudovský、Ivan Lukeš、André E. Merbach
DOI:10.1039/b612876a
日期:——
isomerism was observed. Depending on the nature of the lanthanide(III) ion, the lanthanide(III) complexes of H4do3apOEt are present in solution as up to four different diastereoisomers observable with NMR. The TSAP isomer is the most abundant at the beginning of the lanthanide series and, with a decrease of the ionic radius of lanthanide(III) ions, both TSAP and SAP forms were observed. A second interconversion
合成了两个新的含有一个膦酸酯侧链的大环DOTA状螯合物,作为MRI(磁共振成像)的潜在造影剂。螯合物结合到镧系元素(III在octadentate方式),通过4氮原子,三个羧酸盐和一个膦酸酯氧原子。的溶液结构[LN(do3ap OEt2)(H 2 O)]和[LN(do3ap OET)(H 2 O)] -使用进行了研究31 P和1 H NMR光谱观察到SAP(方形反棱)/ TSAP(方形反棱)异构。取决于镧系元素(III)离子的性质,H 4 do3ap OEt的镧系元素(III)配合物最多可以在溶液中观察到四种不同的非对映异构体。核磁共振。在镧系元素系列开始时,TSAP异构体最丰富,并且随着镧系元素(III)离子的离子半径减小,可以观察到TSAP和SAP形式。第二个相互转换(SAP secondTSAP')在序列结束时变得很重要(TSAP'表示没有配位水分子的TSAP物种)。其余的轴向协调部位被一个水Gd