Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Optical Window to Polarity of Electrolyte Solutions

Version 1 : Received: 26 April 2023 / Approved: 3 May 2023 / Online: 3 May 2023 (10:49:45 CEST)

A peer-reviewed article of this Preprint also exists.

O’Mari, O.; Vullev, V.I. Optical Window to Polarity of Electrolyte Solutions. Molecules 2023, 28, 4360. O’Mari, O.; Vullev, V.I. Optical Window to Polarity of Electrolyte Solutions. Molecules 2023, 28, 4360.

Abstract

Medium polarity plays a crucial role in charge-transfer processes and electrochemistry. The added supporting electrolyte in electrochemical setups, essential for attaining the needed electrical conductivity, sets challenges for estimating medium polarity. Herein, we resort to Lippert–Mataga–Ooshika (LMO) formalism for estimating the Onsager polarity of electrolyte organic solutions pertinent to electrochemical analysis. An amine derivative of 1,8-naphthalimide proves to be an appropriate photoprobe for LMO analysis. An increase in electrolyte concentration enhances the polarity of the solutions. This effect becomes especially pronounced for low-polarity solvents. Measured refractive indexes provide a means for converting Onsager to Born polarity, which is essential for analyzing medium effects on electrochemical trends. This study demonstrates a robust optical means, encompassing steady-state spectroscopy and refractometry, for characterizing solution properties important for charge-transfer science and electrochemistry.

Keywords

Stokes’ shift; dipole; absorption; fluorescence; refractometry

Subject

Chemistry and Materials Science, Physical Chemistry

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