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Issue 18, 2017
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Photoswitchable molecules as key ingredients to drive systems away from the global thermodynamic minimum

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Abstract

In order to perform chemical work, molecular systems have to be operated away from thermodynamic equilibrium and therefore require the input of energy. Light is perhaps the most abundant and advantageous energy source that in combination with photoswitches allows for a reversible and hence continuous stimulation of a system. In this review, we illustrate how photoswitchable molecules can be used to escape the global thermodynamic minimum by populating metastable states, from which energy can be transferred and transformed in a controlled fashion. We emphasize the unique feature of photodynamic equilibria, in which population of the states is dictated by the excitation wavelength (and not primarily by temperature), thereby avoiding microscopic reversibility since the photoreaction involves an electronically excited state. Thus, photoswitchable molecular systems can remotely be controlled with high spatial and temporal resolution and in addition their action can be fueled by light.

Graphical abstract: Photoswitchable molecules as key ingredients to drive systems away from the global thermodynamic minimum

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Publication details

The article was received on 14 Feb 2017 and first published on 31 Aug 2017


Article type: Review Article
DOI: 10.1039/C7CS00112F
Citation: Chem. Soc. Rev., 2017,46, 5536-5550
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    Photoswitchable molecules as key ingredients to drive systems away from the global thermodynamic minimum

    M. Kathan and S. Hecht, Chem. Soc. Rev., 2017, 46, 5536
    DOI: 10.1039/C7CS00112F

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