Synthesis and characterization of lanthanide complexes of DO3A-alkylphosphonates
作者:Ilgar Mamedov、Anurag Mishra、Goran Angelovski、Hermann A. Mayer、Lars-Olof Pålsson、David Parker、Nikos K. Logothetis
DOI:10.1039/b711351j
日期:——
Eight DO3A-based lanthanide(III) complexes bearing ester protected and unprotected phosphonate groups at variable distances from the macrocyclic moiety have been synthesized and analyzed. The ligands were made by straightforward four-step synthetic procedures and purified with preparative RP-HPLC, after which they were used to prepare gadolinium(III) and europium(III) complexes. Relaxometric experiments
八个带有DO3A的镧系元素(III)配合物酯已经合成并分析了距大环部分可变距离的保护的和未保护的膦酸酯基团。这配体 通过简单的四步合成程序制备,并经制备纯化 反相高效液相色谱之后,将它们用于制备g(III)和euro(III)配合物。在300 MHz下对Gd(III)配合物进行了弛豫实验,改变了溶液的pH值或人血清白蛋白(HSA)的浓度。发现当介质的pH从中性改变为pH 4时,GdDO3A-乙基膦酸酯和GdDO3A-丙基膦酸酯复合物的纵向弛豫率分别增加了50%和60%。这些配合物的二乙酯在相同的pH范围内不会改变纵向弛豫性,但在结合HSA时其横向弛豫性会增加。31 P NMREu(III)配合物的实验表明,在观察到最高弛豫度变化的相同区域中,两种酸配合物的化学位移发生了变化,并证明了配合物在研究的pH范围内的稳定性,而没有观察到位移。二酯复合体。对euro(III)配合物的发光研究进一步支
10-substituted 1-, 4, 7,-tris (carboxymethyl)-1,4,7,10-tetraazacyclo-dodecane derivative for use as contrast agents
申请人:Max-Planck-Gesellschaft zur Förderung
der Wissenschaften e.V.
公开号:EP1637524A1
公开(公告)日:2006-03-22
The present invention relates to smart chelating agents suitable for forming stable complexes with lanthanides and/or transition metals.