Gd-complexes. Thus, the 1H relaxometric study on [Gd2PCTA2(H2O)4] and on [Gd2AAZTA2(H2O)4]2− highlighted the remarkable rigidity and compactness of the two binuclear complexes, which results in molar relaxivities (per Gd), at 1.5 T and 298 K of ca. 12–12.6 mM−1 s−1 with an increase of ca. 80 % at 1.5 T and 298 K (+70 % at 310 K) with respect to the corresponding mononuclear complexes.
12 元吡啶基聚氨基羧酸盐大环配体 PCTA 的第一个双核 Gd 配合物是通过两种不同的合成程序通过吡啶单元的 C-C 连接合成的。还合成了二聚 AAZTA 配体,目的是比较松弛测量结果或两种双位 Gd 复合物。因此,[Gd 2 PCTA 2 (H 2 O) 4 ] 和 [Gd 2 AAZTA 2 (H 2 O) 4 ] 2−的1 H 弛豫研究突出了两种双核配合物的显着刚性和致密性,结果摩尔弛豫率(每 Gd),在 1.5 T 和 298 K 的约。12–12.6 毫米-1 s -1增加约。相对于相应的单核复合物,在 1.5 T 和 298 K 时为 80%(在 310 K 时为 +70%)。
Surface engineering of silica nanoparticles with a gadolinium–PCTA complex for efficient <i>T</i><sub>1</sub>-weighted MRI contrast agents
pendant carboxylic acid or alcohol functions have been synthesized and used to form diaqua Gd(III) complexes, which have been immobilized onto dense silica nanoparticles. Cytotoxicity studies of these complexes (free or immobilized on the nanoparticles) on normal 1BR3G cells and cancerous HCT 116 cells indicated a dependence on the pendant chemical group for the free complexes. However, this effect disappeared
We describe a convenient scalable synthesis of 4-carbomethoxy-6,6′-dimethyl-2,2′-bipyridine based on the application of modifiedNegishicross-coupling conditions. The use of this building block in the preparation of a number of dissymmetrically 6,6′-trisubstituted-2,2′-bipyridines and of bifunctional lanthanide chelators is also reported.
H<sub>4</sub>octapa: An Acyclic Chelator for <sup>111</sup>In Radiopharmaceuticals
作者:Eric W. Price、Jacqueline F. Cawthray、Gwendolyn A. Bailey、Cara L. Ferreira、Eszter Boros、Michael J. Adam、Chris Orvig
DOI:10.1021/ja3024725
日期:2012.5.23
7-coordinate solution structure, which forms a single isomer and exhibits no observable fluxional behavior at ambienttemperature, an improvement to the multiple isomers formed by [In(DTPA)](2-) and [In(DOTA)](-) under the same conditions. Potentiometric titrations have determined the thermodynamic formation constant of the [In(octapa)](-) complex to be log K(ML) = 26.8(1). Through the same set of analyses,