Hoque Md Najbul, Basu Arghya, Das Gopal
Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781 039, India.
J Fluoresc. 2014 Mar;24(2):411-6. doi: 10.1007/s10895-013-1306-7. Epub 2013 Oct 5.
We report the selective recognition of sulfate anion in aqueous medium at biological pH 7.2 over the other interfering anions based on naphthoic acid bearing tripodal ligand by applying fluorescence turn off -on mechanism. The carboxylic acid groups in the ligand enhance the solubility in water and enable it to form complex with copper salt. Thus formed L-Cu2+ ensemble quench the fluorescence of the parent ligand and in turn recognize sulfate anion via revival of fluorescence intensity. The 1:2 stoichiometry was confirmed by ESI mass spectral data and Job's plot. The average binding constant was found to be 6.2×10(8) M(-2).
我们报道了基于带有三脚架配体的萘甲酸，通过荧光关闭-开启机制，在生物pH值7.2的水性介质中对硫酸根阴离子相对于其他干扰阴离子的选择性识别。配体中的羧酸基团提高了在水中的溶解度，并使其能够与铜盐形成络合物。由此形成的L-Cu2+组合使母体配体的荧光猝灭，进而通过荧光强度的恢复来识别硫酸根阴离子。ESI质谱数据和Job曲线证实了1:2的化学计量比。发现平均结合常数为6.2×10(8) M(-2)。
