The triplet lifetimes of hindered 4′-substituted-2,4,6-tri-isopropylbenzophenones decrease (increase) with the increasing electron-donating (withdrawing) ability of the ring substituents; this is the opposite effect to that expected from the rate of the intermolecular hydrogen-abstraction reaction of unhindered benzophenones.
Y. Ito, Y. Umehara, Y. Yamada and T. Matsuura, J. Chem. Soc., Chem. Commun., 1980, 1160 DOI: 10.1039/C39800001160
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