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Issue 1, 2020
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Pyrene–viologen complexes in SDS micelles: quenching parameters and use as probes of aggregation numbers

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Abstract

Through a formal-kinetic treatment, we rigorously derive the micellar occupations in the presence of fluorophore–quencher ground-state complexes and the resulting expressions for the time-dependent and stationary observables in the case of combined static and dynamic quenching. We present a protocol for data analysis that effectively isolates the processes, thereby ensuring rapid fit convergence and unique parameter sets. By this approach, we interpret time-resolved fluorescence measurements on pyrene quenched by a homologous series of viologens in SDS micelles. The dynamic intramicellar quenching is diffusion limited; and the formation of the ground-state complexes is entropy driven, with a constant increment per methylene group in the viologen sidechains. The micellar aggregation numbers are obtained with a precision comparable to neutron scattering, including their temperature dependence.

Graphical abstract: Pyrene–viologen complexes in SDS micelles: quenching parameters and use as probes of aggregation numbers

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Article information


Submitted
09 Nov 2019
Accepted
10 Dec 2019
First published
11 Dec 2019

Photochem. Photobiol. Sci., 2020,19, 71-79
Article type
Paper

Pyrene–viologen complexes in SDS micelles: quenching parameters and use as probes of aggregation numbers

T. Kohlmann and M. Goez, Photochem. Photobiol. Sci., 2020, 19, 71
DOI: 10.1039/C9PP00439D

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