Chemosensing ability of hydroxynaphthylidene derivatives of hydrazine towards Cu 2 + : Experimental and computational studies
作者:JAYARAMAN DESSINGIOU、JAYSHREE K KHEDKAR、CHEBROLU P RAO
DOI:10.1007/s12039-014-0648-2
日期:2014.7
2-Hydroxynaphthylidene derivatives of hydrazine, namely L 1 , L 2 and L 3 , were synthesized by going through two-step reactions and the products were characterized. The ion recognition properties of these receptors were studied using fluorescence and absorption spectroscopy. The receptors were found to be sensitive and selective towards Cu2+ in methanol solution among the 13 metal ions studied, namely Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+, Na+, K+, Ca2+ and Mg2+, by exhibiting switch off fluorescence. The stoichiometry of the complexed species was found to be 2:1. The fluorescence quenching with Cu2+ is in the order of L 1 > L 2 > L 3 . These conjugates were also found to act as colorimetric sensors for Cu2+ in solution by exhibiting visual colour change. The 2:1 complex shows a centrosymmetric structure based on DFT computations.
通过两步反应合成了肼的 2-羟基亚萘衍生物,即 L 1、L 2 和 L 3,并对产物进行了表征。利用荧光和吸收光谱对这些受体的离子识别特性进行了研究。在所研究的 13 种金属离子(即 Mn2+、Fe2+、Co2+、Ni2+、Cu2+、Zn2+、Cd2+、Hg2+、Pb2+、Na+、K+、Ca2+ 和 Mg2+)中,这些受体对甲醇溶液中的 Cu2+ 具有敏感性和选择性,表现出开关荧光。络合物种的化学计量为 2:1。与 Cu2+ 的荧光淬灭顺序为 L 1 > L 2 > L 3。研究还发现,这些共轭物可作为溶液中 Cu2+ 的比色传感器,表现出肉眼可见的颜色变化。根据 DFT 计算,2:1 复合物显示出中心对称结构。