Effect of Confinement on Excited-State Proton Transfer of Firefly鈥檚 Chromophore d-Luciferin in AOT Reverse Micelles

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• 作者：Jagannath Kuchlyan ; Debasis Banik ; Niloy Kundu ; Surajit Ghosh ; Chiranjib Banerjee ; Nilmoni Sarkar
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：March 27, 2014
• 年：2014
• 卷：118
• 期：12
• 页码：3401-3408
• 全文大小：428K
• 年卷期：v.118,no.12(March 27, 2014)
• ISSN：1520-5207

文摘

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鈥揙T (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.