Switches are frequently used to provide external control over the conformation and function of organic and bio-organic molecules. While the use of bistable switches is widespread, multi-stable examples are observed relatively rarely. Reported here is a new class of molecular switch that is capable of forming three stable states of varied geometries, two of which can be induced to interconvert reversibly using either light or acid.
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Lawson et al. (2012) studied this question.
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