New insights into water-soluble and water-coordinated copper 15-metallacrown-5 gadolinium complexes designed for high-field magnetic resonance imaging applications
作者:Marina A. Katkova、Galina S. Zabrodina、Evgeny V. Baranov、Maria S. Muravyeva、Evgeny A. Kluev、Andrey S. Shavyrin、Grigory Yu Zhigulin、Sergey Yu Ketkov
DOI:10.1002/aoc.4389
日期:2018.7
the Gd(III) ion: Gd(H2O)4[15‐MCCu(II)Glyha‐5](Cl)3 (1(Gd)), Gd(H2O)4[15‐MCCu(II)Alaha‐5](Cl)3 (2(Gd)), Gd(H2O)3[15‐MCCu(II)Phalaha‐5](Cl)3 (3(Gd)) and Gd(H2O)3[15‐MCCu(II)Tyrha‐5](Cl)3 (4(Gd)). In these systems, the Ln(III) central ion is coordinated by five oxygen donor atoms of the ligands and three or four inner‐sphere water molecules. The X‐ray crystal structure of metallacrown Ln(H2O)3,4[15‐MCCu(II)Rha‐5]3+
需要开发专门设计用于高场磁共振成像(MRI)的造影剂,因为经典Gd(III)造影剂的弛豫效率会随着磁场强度的增加而显着降低。为了探索镧系元素(Ln)15‐MC‐5金属lac的独特结构,我们开发了一系列水溶性Gd(III)水络合物,它们带有氨基异羟肟酸酯(甘氨酸,α‐丙氨酸,α‐苯丙氨酸和α -酪氨酸)配体,其中越来越多的水分子直接与Gd(III)离子配位:Gd(H 2 O)4 [15-MC Cu(II)Glyha -5](Cl)3(1(Gd)) ,Gd(H 2 O)4 [15-MC Cu(II)Alaha‐5](Cl)3(2(Gd)),Gd(H 2 O)3 [15-MC Cu(II)Phalaha ‐5](Cl)3(3(Gd))和Gd(H 2 O)3 [15-MC Cu(II)Tyrha- 5] [Cl)3(4(Gd))。在这些系统中,Ln(III)中心离子由配体的五个氧供体原子和三个或四个内层水分子协调。金属催乳Ln(H