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Title of article :
Interaction of the excited state intramolecular proton transfer probe 3-hydroxy-2-naphthoic acid with poly N-vinyl-2-pyrrolidone polymer in water: An insight into the water structure in the binding region
Author/Authors :
Anirban Pal، نويسنده , , Shyam Sundar Maity، نويسنده , , Subhodip Samanta، نويسنده , , Pinki Saha Sardar، نويسنده , , Maitrayee Basu Roy and Sanjib Ghosh، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
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Abstract :
The enhancement of the excited state intramolecular proton transfer (ESIPT) emission of 3-hydroxy-2-naphthoic acid (3HNA) in presence of poly N-vinyl-2-pyrrolidone (PVP) has been investigated by time resolved fluorescence and anisotropy measurement. In other water soluble polymers and monomers there is no enhancement of the ESIPT emission of 3HNA. The microenvironment of the probe in PVP–water mixture is investigated by comparing the ESIPT emission of 3HNA in mixed solvents of acetonitrile–toluene. The anisotropy, rotational correlation time and the blue shift observed in the ESIPT emission in PVP–water mixture have been ascribed to both the polarity and the motional restriction of the probe imposed by the bound water region of PVP.
Keywords :
fluorescence , Hydroxy naphthoic acid , excited state intramolecular proton transfer , rotational correlation time , bound water , Poly vinyl pyrrolidone
Journal title :
Journal of Luminescence
Link To Document :