Novel fluorescent chemosensors based on tryptophan unit for Cu2+ and Fe3+ in aqueous solution

Research paper by Peng-fei Cheng, Kuo-xi Xu, Wen-yong Yao, Hua-jie Kong, Li Kou, Xiao-dan Ma, Chao-jie Wang

Indexed on: 24 Jun '13Published on: 24 Jun '13Published in: Chemical Research in Chinese Universities


We reported four fluorescent chemosensors containing tryptophan units. The fluorescence spectrum titration experiments suggest that chemosensors 1, 2, 3 and 4 are highly selective for Cu2+ and Fe3+ over Li+, Na+, K+, Co2+, Zn2+, Ni2+, Hg2+ and Cr3+via forming complexes with Cu2+ or Fe3+, which is confirmed by dramatical quench of fluoreseence in aqueous solution at pH 7.4, thus making all the chemosensors suitable for Cu2+ and Fe3+ fluorescent sensors.