Abstract
The triplet decay rates of ten β-aryl-4-methoxypropiophenone derivatives in methanol, acetonitrile, toluene and isooctane solution at 21 °C correlate with δ+ substituent constants (p+–1.8 ± 0.2), indicating that charge-transfer exciplex interactions between the aryl group (donor) and the carbonyl group (acceptor) play a dominant role in the intramolecular β-aryl quenching of carbonyl n,πtriplets.
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