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A New Disubstituted Polyacetylene Bearing Pyridine Moieties: Convenient Synthesis and Sensitive Chemosensor toward Sulfide Anion with High Selectivity

2011; American Chemical Society; Volume: 44; Issue: 13 Linguagem: Inglês

10.1021/ma200777e

1520-5835

Liang Zhang, Xiaoding Lou, Yun Yu, Jingui Qin, Zhen Li,

Molecular Sensors and Ion Detection

To develop sensitive and selective S2– chemosensors, a new disubstituted polyacetylene (P2) bearing pyridine moieties in the side chains was prepared conveniently through a postfunctional method, the strong green fluorescence of which could be completely quenched by Cu2+ ions at the concentration as low as 2.0 × 10–6 mol/L in diluted solutions. Based on the displacement strategy, by utilizing the much higher stability constant of the complex of S2– and Cu2+, the quenched fluorescence of the solution of P2 by Cu2+ ions could recover upon the addition of trace S2– anions, with the detection limit down to 5.0 × 10–7 mol/L. Moreover, no interference were observed from other anions, including SO32–, HSO3–, SO42–, ClO4–, I–, Br–, Cl–, F–, IO3–, HPO42–, PO43–, C2O42–, S2O32–, CO32–, AcO–, CN–, and P2O74–, making P2 a novel, sensitive, and selective sulfide probe.