pH unit–1 at 37 °C. Here, we demonstrate through a series of CF3-functionalized CoII2 complexes [(XL′)Co2(etidronate)]− (X = NO2, F, Me), that modest changes in the electronic structure of CoII centers through remote ligand substitution can significantly affect the NMR and CEST properties of Co2-based PARACEST probes. Variable-pH NMR and CEST analyses reveal that the chemical shifts of the ligand protons
我们报告了三个新的基于Co 2的顺磁
化学交换饱和转移(P
ARACEST)探针,能够按比例定量pH值。Co II 2络合物[LCo 2(etidronate )] -,具有四(羧酰胺)和OH取代的
依替膦酸酯
配体,具有相反的pH依赖性CEST峰强度,先前已显示出log(CEST OH / CEST)之间呈线性相关NH)和pH在6.5-7.6范围内,在37°C时灵敏度为0.99(7)pH单位–1。在这里,我们通过一系列CF 3官能化的Co II 2配合物[(X L')Co2(etidronate)] -(X = NO 2,F,Me),通过远距离
配体取代而引起的Co II中心电子结构的适度变化会显着影响基于Co 2的P
ARACEST探针的NMR和CEST特性。可变pH NMR和CEST分析表明,
配体质子的
化学位移受X取代基的性质高度影响。对于X = NO 2,F和Me,分别在115和88、93和79以及88和76