Modulation of Excited-State Proton-Transfer Dynamics inside the Nanocavity of Microheterogeneous Systems: Microenvironment-Sensitive Forster Energy Transfer to Riboflavin

Dey, Nilanjan and Biswakarma, Dipen and Bajpai, Alankriti and Moorthy, Jarugu Narasimha and Bhattacharya, Santanu (2019) Modulation of Excited-State Proton-Transfer Dynamics inside the Nanocavity of Microheterogeneous Systems: Microenvironment-Sensitive Forster Energy Transfer to Riboflavin. In: CHEMPHYSCHEM, 20 (6). pp. 881-889.

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Abstract

The excited-state proton-transfer efficiency of a tetraarylpyrene derivative, 1,3,6,8-tetrakis(4-hydroxy-2,6-dimethylphenyl)pyrene (TDMPP), was investigated thoroughly in the presence of various surfactant assemblies, such as micelles and vesicles. The confined microheterogeneous environments can significantly retard the extent of the excited-state proton-transfer process, resulting in a distinguishable optical signal compared to that in the bulk medium. Physical characteristics of the surfactant assemblies, such as order, interfacial hydration, and surface charge, influence the proton transfer process and allow multiparametric sensing. A higher degree of interfacial hydration facilitates the proton-transfer process, while the positively charged head groups of the surfactants specifically stabilize the anionic form of the probe (TDMPP-O*). Furthermore, Forster energy transfer from the probe to riboflavin was studied in a phospholipid membrane, wherein the relative ratio of the neutral versus anionic forms (TDMPP-OH/TDMPP-O*) was found to influence the extent of energy transfer. Overall, we demonstrate how an ultrafast photophysical process, that is, the excited-state proton transfer, can be influenced by the microenvironment.

Item Type:	Journal Article
Publication:	CHEMPHYSCHEM
Publisher:	WILEY-V C H VERLAG GMBH
Additional Information:	Copyright of this article belongs to WILEY-V C H VERLAG GMBH
Keywords:	energy transfer; excited-state proton transfer; microenvironment; microheterogeneous system; surfactants
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	17 May 2019 07:46
Last Modified:	17 May 2019 07:46
URI:	http://eprints.iisc.ac.in/id/eprint/62370

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