科研之友
微信
新浪微博
Facebook
分享链接
摘要
A new Schiff base, 4-allylamine-N-(N-5-methylsalicylidene)- 1,8-naphthalimide (1), has been designed and synthesized by combining a 1,8-naphthalimide moiety as a fluorophore and a Schiff base as a recognition group. Its photophysical properties were investigated by absorption and fluorescence spectroscopy, and this sensor exhibits a high fluorescence quantum yield of 0.75-0.91 inorganic solvents of different polarity. It also shows high selectivity for Cu2+ over other ions with fluorescence quenching in aqueous medium (pH = 7.2). The reason for this phenomenon (fluorescence quenching) is attributed to the formation of a 1 : 1 complex between 1 and Cu2+ according to the Job plot and fluorescence titration. The sensor can be applied to the quantification of Cu2+ in a linear fashion from 0.5 to 5 mu M with a detection limit of 0.23 mu M. Additionally, the association constant (K-a) between Cu2+ and 1 is 1.328 x 10(6) M-1 in aqueous media.
- 出版日期2017-1
- 单位兰州交通大学
