title: Role of solvation dynamics in excited state proton transfer of 1-naphthol in nanoscopic water clusters formed in a hydrophobic solvent.
abstract: Excited state proton transfer (ESPT) in biologically relevant organic molecules in aqueous environments following photoexcitation is very crucial as the reorganization of polar solvents (solvation) in the locally excited (LE) state of the organic molecule plays an important role in the overall rate of the ESPT process. A clear evolution of the two photoinduced dynamics in a model ESPT probe 1-naphthol (NpOH) upon ultrafast photoexcitation is the motive of the present study. Herein, the detailed kinetics of the ESPT reaction of NpOH in water clusters formed in hydrophobic solvent are investigated. Distinct values of time constants associated with proton transfer and solvent relaxation have been achieved through picosecond-resolved fluorescence measurements. We have also used a model solvation probe Coumarin 500 (C500) to investigate the dynamics of solvation in the same environmental condition. The temperature dependent picosecond-resolved measurement of ESPT of NpOH and the dynamics of solvation from C500 identify the magnitude of intermolecular hydrogen bonding energy in the water cluster associated with the ultrafast ESPT process.
authors.affiliation: Department of Chemical, Biological and Macromolecular Sciences, S N Bose National Centre for Basic Sciences, Salt Lake, Kolkata, India.
authors.forename: Surajit
authors.initials: S
authors.lastname: Rakshit
authors.forename: Ranajay
authors.initials: R
authors.lastname: Saha
authors.forename: Pramod Kumar
authors.initials: PK
authors.lastname: Verma
authors.forename: Samir Kumar
authors.initials: SK
authors.lastname: Pal
mesh_terms: D003374:Coumarins; D005456:Fluorescent Dyes; D006859:Hydrogen / Q000737:chemistry*; D006860:Hydrogen Bonding; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D008958:Models, Molecular; D009284:Naphthols / Q000737:chemistry*; D011522:Protons; D012995:Solubility; D012997:Solvents; D013050:Spectrometry, Fluorescence; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: C514684:7-(ethylamino)-4-trifluoromethylcoumarin; D003374:Coumarins; D005456:Fluorescent Dyes; D009284:Naphthols; D011522:Protons; D012997:Solvents; D014867:Water; C029350:1-naphthol; D006859:Hydrogen