Aryl-Phosphonate Lanthanide Complexes and Their Fluorinated Derivatives: Investigation of Their Unusual Relaxometric Behavior and Potential Application as Dual Frequency<sup>1</sup>H/<sup>19</sup>F MRI Probes
作者:Matteo P. Placidi、Mauro Botta、Ferenc K. Kálmán、Gisela E. Hagberg、Zsolt Baranyai、Andreas Krenzer、Alexandria K. Rogerson、Imre Tóth、Nikos K. Logothetis、Goran Angelovski
DOI:10.1002/chem.201300763
日期:2013.8.26
A series of low molecular weight lanthanide complexes were developed that have high 1H longitudinal relaxivities (r1) and the potential to be used as dual frequency 1H and 19F MR probes. Their behavior was investigated in more detail through relaxometry, pH‐potentiometry, luminescence, and multinuclear NMR spectroscopy. Fitting of the 1H NMRD and 17O NMR profiles demonstrated a very short water residence
开发了一系列具有高1 H纵向弛豫度(r 1)并可用作双频1 H和19 F MR探针的低分子量镧系元素络合物。通过弛豫法,pH电位法,发光法和多核NMR光谱对它们的行为进行了更详细的研究。1 H NMRD和17 O NMR曲线的拟合显示出非常短的水停留寿命(<10 ns)和明显的第二球效应。在较低的场强(20 MHz)下,两个复合物在r 1中显示出一个峰值(21.7和16.3 m M -1 s -1)是由团聚引起的,可以通过添加磷酸根阴离子来破坏。NMR光谱显示,通过分子内结合过程相互转化的溶液中至少存在两种物质。两种络合物在19 F NMR光谱中提供了合适的信号,并且通过选择优化的成像参数,在MRI扫描仪中以低至1 m M的浓度获得了幻像图像。可以通过1 H和19 F MRI可视化已开发的探头,表明它们具有用作双频MRI造影剂的能力。