ArticleCommunications chemistry2026
A state-switchable TADF macrocycle for multi-analyte sensing and hydrogen gas-driven emission enhancement.
Article in Communications chemistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Photochemical sensing demands systems that adjust their optical properties without altering chromophore structure. Here, we report CPCQ, a thermally activated delayed fluorescence (TADF)-active macrocycle, as a responsive platform for optical sensing. CPCQ shows a photoluminescence quantum yield (PLQY) of 78%, a delayed lifetime of 243 ns, and an efficient reverse intersystem crossing rate of 2.68 × 10⁷ s⁻¹. Unlike conventional fluorescent and TADF emitters, CPCQ with cyclic array of four TADF active donor-acceptors enables reversible state switching of its emission mechanism. Electron-deficient guests form exciplexes with reducing fluorescence and shifting emission. In contrast, electron-rich guests enhance delayed fluorescence (248 ns) via the heavy atom effect. Oxygen quenches charge-transfer emission and restores blue-shifted locally excited (LE) emission. Strikingly, hydrogen flips the effect, triples LE emission (k
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