Tuning Mg(II) Selectivity: Comparative Analysis of the Photophysical Properties of Four Fluorescent Probes with an Alkynyl-Naphthalene Fluorophore
作者:Edward R. H. Walter、J. A. Gareth Williams、David Parker
DOI:10.1002/chem.201800013
日期:2018.4.25
compound has a pKa value between 6.2 and 5.1 and exhibits no significant pH response around pH 7.2. Enhanced selectivity for Mg2+ over Ca2+ was observed with a pentadentate phosphinate substituted system, compared to its carboxylate analogue, due to a 10‐fold lowering of affinity for the Ca2+ ion. In each case, the overall dissociation constants for Mg2+ fall in the low mm range.
合成了四个炔基-1-萘基荧光团,带有适合镁结合的三齿或五齿连接基团。已经使用吸收,发射和激发光谱法评估了它们对镁,钙和锌离子的光物理和结合特性。每种化合物的ap K a值在6.2和5.1之间,并且在pH 7.2左右没有明显的pH响应。与它的羧酸盐类似物相比,使用五齿次膦酸酯取代的系统观察到的Mg 2+相对于Ca 2+的选择性提高,这是由于对Ca 2+离子的亲和力降低了10倍。在每种情况下,Mg 2+的总解离常数都在低m m 范围。