A new disubstituted polyacetylene bearing pyridine moieties: Convenient synthesis and sensitive chemosensor toward sulfide anion with high selectivity

摘要

To develop sensitive and selective S~(2-) 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 Cu~ (2+) 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 S~(2-) and Cu~(2+), the quenched fluorescence of the solution of P2 by Cu2+ ions could recover upon the addition of trace S~(2-) anions, with the detection limit down to 5.0 × 10-7 mol/L. Moreover, no interference were observed from other anions, including SO_3~(2-), HSO _3~-, SO_4~(2-), ClO_4-, I-, Br-, Cl-, F-, IO_3-, HPO_4~(2-), PO_4~(3-), C_2O_4~(2-), S_2O _3~(2-), CO_3~(2-), AcO-, CN -, and P_2O_7~(4-), making P2 a novel, sensitive, and selective sulfide probe.