Nucleobase-Functionalized Conjugated Polymer for Detection of Copper(II)
2014
Xing, Chengfen | Yuan, Hongbo | Xu, Sichuan | An, Hailong | Niu, Ruimin | Zhan, Yong
In recent years, supramolecular organization of thiophene derivatives, oligo- and polythiophene, have been developed with various designs to achieve complex functions. Here, we describe the synthesis and characterization of a conjugated polymer with thymidine side chain bases and polythiophene backbones (PTT) instead of phosphate bonds in DNA, and the PTT exhibits exceptional fluorescence quenching efficiency upon binding of Cu²⁺ ions in aqueous medium, which is suggested to be electron transfer from the π* orbit at the excited state of PTT to the 3d orbit of Cu²⁺ ions and subsequent Cu²⁺-mediated interpolymer π-stacking aggregation. Furthermore, Cu²⁺ ions can be selectively and easily monitored by the fluorescence quenching of PTT, which can be used for detection of Cu²⁺ ions with good selectivity and high sensitivity in aqueous medium. Both experimental and theoretical methods have been devoted to demonstrate the strong affinity and steric interaction of PTT toward Cu²⁺. These findings will illustrate new directions for the design of nucleobase-functionalized materials with transition metals responsive activity.
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