A Self-Assembled Complex with a Titanium(IV) Catecholate Core as a Potential Bimodal Contrast Agent
作者:Geert Dehaen、Svetlana V. Eliseeva、Kristof Kimpe、Sophie Laurent、Luce Vander Elst、Robert N. Muller、Wim Dehaen、Koen Binnemans、Tatjana N. Parac-Vogt
DOI:10.1002/chem.201101413
日期:2012.1.2
has been designed and shown to specifically bind lanthanide(III) ions at the DTPA core ([Ln(H24)(H2O)]−) and further self‐assemble with titanium(IV), thereby giving rise to the formation of a supramolecular metallostar complex with a lanthanide(III)‐to‐titanium(IV) ratio of 3:1, [(Ln4)3Ti(H2O)3]5− (Ln=La, Eu, Gd). The efficacy of the metallostar complex as a potential bimodal optical/magnetic resonance
带有邻苯二酚和二亚乙基三胺-N,N,N',N'',N''-五乙酸酯(DTPA)的对位螯合配体(H 6 4)已被设计并显示出可与DTPA上的镧系元素(III)离子特异性结合核([Ln(H 2 4)(H 2 O)] −)并与钛(IV)进一步自组装,从而形成了具有镧系元素(III)-钛( IV)3:1的比例,[(Ln 4)3 Ti(H 2 O)3 ] 5−(Ln = La,Eu,Gd)。已经评估了金属恒星络合物作为潜在的双峰光学/磁共振成像(MRI)剂的功效。[[Gd 4)3 Ti(H 2 O)3 ] 5-配合物的核磁弛豫弥散(NMRD)测量表明,增强的r 1弛豫性对应于每个金属原子分子在20时 36.9 s -1 m M -1 MHz和310 K,这是滚动速度降低的结果。还通过松弛法测量来检查复合物结合人血清白蛋白(HSA)的能力。此外,在紫外线照射下[[Gd 4)3 Ti(H 2 O)3 ]