Novel benzotriazole-based probes for the selective detection of Cu(II)

Abstract

In this paper, a new kind of fluorescent probe - benzotriazole derivative system was constructed by amino derivatization reaction. By studying the spectral properties of the probe, we found that both the mono-substituted and di-substituted products of the reaction can be used as fluorescent probes for selective detection of Cu2+ ion. Therefore, we can selectively obtain different kinds of fluorescent probes by adjusting the reaction conditions. And these probes have the advantages of low detection limit (3a: 8.83 µM; 3b: 8.62 µM; 3c: 2.01 µM) and high selectivity for other ions (Ca2+,Co2+,Zn2+,Fe3+,Cs+,K+,Mg2+,Ni2+,NH4+,Al3+,Na+,Cr3+,Cd2+). In addition, the fluorescence intensity of these probes responds linearly to [Cu2+], and the presence of Cu2+ ion can be sensitively detected by obvious fluorescence quenching.