Paramagnetic 19F Chemical Shift Probes that Respond Selectively to Calcium or Citrate Levels and Signal Ester Hydrolysis
作者:Peter Harvey、Kirsten H. Chalmers、Elena De Luca、Anurag Mishra、David Parker
DOI:10.1002/chem.201200737
日期:2012.7.9
changes in calcium ion concentrations in the millimolar regime, signal the presence of citrate selectively in competitive aqueous media and allow the monitoring of remote ester/amide hydrolysis in relayed, irreversible transformations. Chemical shift non‐equivalence is amplified by the presence of the proximate lanthanide ion, with a mean separation between the CF3 group and the metal ion of 6.4 Å found
表征了包含近端CF 3基团的顺磁共振化学位移探针。已经建立了不同的系统,可以报告在毫摩尔状态下钙离子浓度的可逆变化,在竞争性水介质中选择性地指示柠檬酸的存在,并允许在连续的,不可逆的转化中监测远程酯/酰胺水解。在金属络合物水合物加合物的X射线结构中,最接近的镧系元素离子的存在会放大化学位移的非等价性,CF 3基团与a络合物的金属离子之间的平均间隔为6.4Å 。19 F核的纵向弛豫速率提高,可以更快地获取数据。