Flicking a switch: Photoinduced electron transfer (PET) occurs between the perylene and the closed (but not the open) form of the diarylethene unit in a prototype optical memory system based on a photochromic diarylethene-perylene bisimide dyad (see picture). This allows three different wavelengths to be used for the read, write, and erase steps without destructive readout occurring by photochromic cycloreversion.
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Berberich et al. (2008) studied this question.
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