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A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Published on: January 16, 2016

Polar solvent dynamics and electron-transfer reactions.

M Maroncelli, J Macinnis, G R Fleming

    Science (New York, N.Y.)
    |March 31, 1989
    PubMed
    Summary

    Solvent dynamics significantly impact chemical reactions by influencing electron transfer. Understanding these non-equilibrium solvation effects is crucial for predicting reaction rates in polar liquids.

    Area of Science:

    • Chemical Dynamics
    • Physical Chemistry
    • Solution Chemistry

    Background:

    • Polar solvents influence reaction rates through equilibrium solvation effects, altering free-energy barriers.
    • Non-equilibrium, dynamical aspects of solvation are less understood but critical for reactions involving rapid charge redistribution.
    • Solvent response time to changing reactant charge distribution dictates reaction coupling.

    Purpose of the Study:

    • To discuss the dynamics of solvation in polar liquids.
    • To investigate the influence of solvation dynamics on electron-transfer reactions.
    • To compare theoretical models with experimental measures of solvation dynamics.

    Main Methods:

    • Utilizing a hierarchy of models, from continuum to molecular, to describe solvation dynamics.

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  • Employing computer simulations to gain insight into the underlying dynamics of polar solvation.
  • Conducting picosecond and subpicosecond time-dependent Stokes shift studies to experimentally measure solvation dynamics.

    • Main Results:

    • Polar solvation occurs on multiple timescales due to diverse solvent motions.
    • Theoretical models and experimental results for solvation dynamics were compared.
    • The influence of solvation dynamics on electron-transfer reactions was considered.

    Conclusions:

    • Solvation dynamics play a critical role in the mechanisms and rates of electron-transfer reactions in polar solvents.
    • A multi-timescale molecular picture of polar solvation is supported by theoretical and experimental evidence.
    • Further investigation into the coupling between reaction dynamics and solvent response is warranted.