Attaching an electron-rich aryl substituent at the 4‘ position of the trpy ligand in Pt(trpy)Cl+ endows the low-lying excited state with intraligand charge-transfer (ILCT) character, enhances the emission intensity, extends the excited-state lifetime, and inhibits exciplex quenching by Lewis bases. When pyrene is the substituent, the complex exhibits singlet- and triplet-state emission and the lifetime extends to 64 μs in room-temperature dichloromethane solution.
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Michalec et al. (2000) studied this question.
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