Highly selective fluorescent probe based on new coordinated cationic polyvinylpyrrolidone for hydrogen sulfide sensing in aqueous solution

A cationic polyvinylpyrrolidone derivative (Cat-PVP) was prepared via Claisen-Schmidt condensation in KOH media (1.0 mM) and characterized using FT-IR and H-1 NMR spectroscopy. The prepared Cat-PVP was utilized to prepare a stable fluorescent copper coordinate Cat-PVP with outstanding properties. The Cu-Cat-PVP was successfully used to detect hydrogen sulfide ( H2S) due to the strong affinity between sulfur and copper. The quenching effect on the fluorescence intensity of the Cu-Cat-PVP probe showed very good linearity with H2S concentrations in the range of 1-40 mu M, with a detection limit as low as 0.13 mu M. The promising probe displayed high selectivity toward H2S over anions and bio-thiols and was successfully applied for detecting H2S in real samples such as human serum and water. (C) 2017 Published by Elsevier B.V.