title: Effect of confinement on excited-state proton transfer of firefly's chromophore D-luciferin in AOT reverse micelles.
abstract: Excited-state intermolecular proton transfer of D-luciferin in reverse micelles has been investigated using steady-state and time-resolved fluorescence spectroscopy measurement. The different polar cores have been chosen for the study of proton transfer dynamics in aerosol-OT (AOT) reverse micelles. It is shown that aqueous reverse micelle is the suitable environment for the photoprotolytic reaction of D-luciferin. The neutral form of the chromophore is present both in ground and excited state at W0 = 0. The proton transfer in nanometer size water pool of water/AOT/n-heptane begins at W0 = 8 and increases with increasing W0 values. However, the intermolecular excited-state proton transfer (ESPT) of D-luciferin is inhibited in nonaquous reverse micelles with DMF and DMSO as a polar core. Thus, the requirement of ESPT of D-luciferin to take place in reverse micelles consists of polar protic solvent like water as a polar core.
authors.affiliation: Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India.
authors.forename: Jagannath
authors.initials: J
authors.lastname: Kuchlyan
authors.forename: Debasis
authors.initials: D
authors.lastname: Banik
authors.forename: Niloy
authors.initials: N
authors.lastname: Kundu
authors.forename: Surajit
authors.initials: S
authors.lastname: Ghosh
authors.forename: Chiranjib
authors.initials: C
authors.lastname: Banerjee
authors.forename: Nilmoni
authors.initials: N
authors.lastname: Sarkar
mesh_terms: D000818:Animals; D052160:Benzothiazoles / Q000737:chemistry* / Q000378:metabolism; D004143:Dioctyl Sulfosuccinic Acid / Q000737:chemistry*; D048888:Fireflies / Q000378:metabolism*; D006536:Heptanes / Q000737:chemistry* / Q000378:metabolism; D008823:Micelles; D015394:Molecular Structure; D011522:Protons; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013501:Surface-Active Agents / Q000737:chemistry; D014867:Water / Q000737:chemistry* / Q000378:metabolism
chemical_list: D052160:Benzothiazoles; C532924:D-luciferin; D006536:Heptanes; D008823:Micelles; D011522:Protons; D012997:Solvents; D013501:Surface-Active Agents; D014867:Water; D004143:Dioctyl Sulfosuccinic Acid; C028618:n-heptane