Azo dyes based on 8-hydroxyquinoline benzoates: Synthesis and application as colorimetric Hg2+-selective chemosensors

作者：Cheng Yunfei; Zhang Meng; Yang Hong; Li Fuyou^*; Yi Tao; Huang Chunhui

来源：Dyes and Pigments, 2008, 76(3): 775-783.

DOI：10.1016/j.dyepig.2007.01.022

• azo dyes
• 8-hydroxyquinoline benzoates
• colorimetric Hg2+-selective chemosensor

A series of 8-hydroxyquinoline benzoates with diverse azo substituents were synthesized by diazo-reaction of 2-methyl-8-hydroxyquinoline with some arylamines, followed by esterification with benzoyl chloride. All the products allowed selective sensing with Hg2+, Which was affirmed by UV-vis absorption spectra. Different spectral changes were observed for these compounds with electron-donating substituent (bathochromic shift) or electron-withdrawing substituent (hypsochromic shift). Particularly, obvious color change was observed for 5-(4-dimethylaminophenylazo)-2-methylquinolin-8-yl benzoate in the presence of Hg2+, which made it possible for distinguishing Hg2+ from other metal ions by naked eye.

• 出版日期2008
• 单位复旦大学