Issue 12, 2024

The use of a tertiary solvent mixture to study solvent dynamic effects in the photoinduced electron transfer reaction of excited singlet pyrene and indole

Abstract

In a series of tertiary solvent mixtures comprising propyl acetate (PA), butyronitrile (BN) and diethyl phthalate (DEP), spanning a wide range of dielectric constants (5.90 < εs < 23.4) while maintaining both refractive index and viscosity constant, rate constants of photoinduced electron transfer (PET) reactions between excited pyrene and indole were measured and compared with those obtained in single neat organic solvents. Quenching rate constants were studied using the Stern–Volmer method and dynamic quenching was confirmed by time-correlated fluorescence lifetime measurements. In a previous study using different pure organic solvents and varying all solvent parameters (Previtali et al.), the solvent dependence of the pyrene/indole pair was described based on the semi-classical theory of adiabatic and non-adiabatic electron transfer reactions. Here the pure rate dependence on the dielectric constant is reported.

Graphical abstract: The use of a tertiary solvent mixture to study solvent dynamic effects in the photoinduced electron transfer reaction of excited singlet pyrene and indole

Article information

Article type
Paper
Submitted
14 Nov 2023
Accepted
21 Feb 2024
First published
22 Feb 2024

New J. Chem., 2024,48, 5392-5398

The use of a tertiary solvent mixture to study solvent dynamic effects in the photoinduced electron transfer reaction of excited singlet pyrene and indole

S. Landgraf, G. Grampp, K. Rasmussen, T. Suwunwong and P. Choto, New J. Chem., 2024, 48, 5392 DOI: 10.1039/D3NJ05255A

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