ZnII coordination by the tetraamine spacer of the two-component system 1 brings the dimethylaniline fragment (donor) and the anthracene subunit (fluorophore) close enough to allow a photoinduced electron-transfer (PET) process to take place. Transition metals (e.g. CuII, NiII) quench the fluorophore, preventing intramolecular PET.
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Fabbrizzi et al. (1996) studied this question.
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