Abstract
AbstractThe synthesis and characterization of free‐base and ZnII tetraazaporphyrins with tetraphenylethylene (TPE) or diphenylphenanthrene (DPP) moieties that are known to be aggregation‐induced emission (AIE) active is reported. The optical spectra contain the characteristic Q and B absorption bands of Gouterman's four‐orbital model and a broad envelope of weaker charge‐transfer bands in the 450–600 nm region. The observed fluorescence emission lies beyond 670 nm and originates exclusively from the decay of the S1 state of the macrocycle, regardless of the excitation wavelength used. Theoretical calculations provide further evidence of strong electronic communication between the peripheral TPE or DPP moieties and the central ring. The ZnII complexes were found to have relatively high singlet‐oxygen quantum yields.
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