三足罗丹明B酰肼席夫碱化合物对Hg~(2+)的识别性质研究

设计、合成并表征了1种新型的三足罗丹明B酰肼席夫碱化合物1.通过紫外-可见分光光度滴定和荧光滴定研究了阳离子和化合物1的相互作用.结果表明在16种金属离子中,只有Hg~(2+)对化合物1的荧光发射强度有显著的影响,化合物1对Hg~(2+)表现出高选择性和高灵敏度的发光和显色传感.体系的荧光随着汞离子的加入而增强,溶液颜色由无色变成粉红色.化合物1在乙醇-DMF (V/V=4∶1)溶液中与Hg~(2+)以1∶3的比例结合,结合常数为1. 66×106,最低检测限为3×10~(-7)mol/L.

Recognition properties of a tripodal rhodamine B Schiff Compound 1 for Hg~(2+)

A novel tripodal rhodamine B derivative compound 1 is synthesized and characterized. The interactions between the cations and this compound are studied through the titrimetry with UV-vis spectrophotometry and fluorescence spectra. The fluorescence investigations show that among the 16 metal ions only the fluorescence of compound 1 is remarkably affected upon the addition of Hg~(2+) . It can serve as a fluorescent and colorimetric sensor with high selectivity and sensitivity toward Hg~(2+) . The fluorescence intensity of compound 1 increases dramatically with the increasing concentration of Hg~(2+) ion,and the color of the solution changes from colorless to pink. Compound 1 exhibits a 1∶ 3 binding ratio with Hg~(2+) in Et OH/DMF solution( V/V = 4∶ 1) with the binding constant of 1. 66 × 106 and detection limit of 3 × 10~(-7) mol/L.