Proton Transfer Pathways of 2,2′-Bipyridine-3,3′-diol in pH Responsive Fatty Acid Self-Assemblies: Multiwavelength Fluorescence Lifetime Imaging in a Single Vesicle
作者： Niloy Kundu , Pavel Banerjee , Rupam Dutta , Sangita Kundu , Rajesh Kumar Saini
DOI: 10.1021/ACS.LANGMUIR.6B03404
关键词: Fluorescence 、 Chemistry 、 Microviscosity 、 Supramolecular chemistry 、 Micelle 、 Fluorophore 、 Photochemistry 、 2,2'-Bipyridine 、 Vesicle 、 Fluorescence anisotropy
摘要: Fatty acids are known to form different supramolecular aggregates in aqueous solutions depending on the pH of medium. The dynamics transformation oleate micelles into oleic acid/oleate vesicles has been investigated using a pH-sensitive intramolecular proton transfer fluorophore, 2,2′-bipyridine-3,3′-diol [BP(OH)2]. Different prototropic forms BP(OH)2 exist values system, and thus, ground state excited have modulated these confined media. formation tautomeric (at basic pH) is confirmed time-resolved emission spectra fluorescence anisotropy measurements. hydrophobic environment provided by assemblies reduces water-assisted nonradiative decay channels lengthens lifetime BP(OH)2. rotational relaxation time micellar assembly higher than that vesicle, which may be due microviscosity sensed by...
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