Exciting assemblies: A metal–organic self-assembly of pyrenebutyric acid (PBA), 1,10-phenanthroline (o-phen), and MgII shows solid-state fluorescence originating from a 1:1 PBA–o-phen exciplex. This exciplex fluorescence is sensitized by another residual PBA chromophore through an excited-state energy-transfer process. The solvent polarity modulates the self-assembly and the corresponding exciplex as well as the energy transfer, resulting in tunable emission of the hybrid (see figure).
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