Fluorescence is reversibly photoregulated in high‐density random copolymers constructed from photochromic phenoxynaphthacenequinones and porphyrins (see Figure) using ring‐opening metathesis polymerization. Alternating irradiation of the polymers with ultraviolet and visible light toggles the photochromic components between two isomers differing in their ability to act as electron‐acceptors in a photoinduced electron‐transfer process.
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Myles et al. (2004) studied this question.
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