Proton transfer reactions in nanoscopic polar domains: 3-hydroxyflavone in AOT reverse micelles

摘要: A dramatic reduction in the excited-state intramolecular proton transfer (ESIPT) rate is observed for 3-hydroxyflavone (3-HF) within nanoscopic polar domains of Aerosol-OT (AOT)/n-heptane reverse micelle solutions. It attributed to formation intermolecularly hydrogen-bonded 3-HF:AOT complexes, which cause a significant disruption hydrogen bonding complex-bound 3-HF molecules, thereby limiting overall ESIPT process. Introduction strong hydrogen-bonding solvents like water or methanol into micelles causes extensive solvation AOT head groups, leading collapse complex and eventual release intramolecularly molecules are then able undergo ultrafast ESIPT. With increasing W-value (W=[polar solvent]:[AOT]), larger number complexes decimated, thus accelerating In contrast, presence acetonitrile, whose hydrogen...