Journal of the American Chemical Society p. 5163 - 5166 (1985)
Update date:2022-08-11
Topics:
Caldwell, Richard A.
Dhawan, S. N.
Moore, D. E.
The transient spectroscopy of γ-phenylbutyrophenone in a 2:1 (v/v) methanol:water mixture has been studied as a function of pH.The lifetime of the Norrish II 1,4-biradical shows an excellent titration curve.The moderately strongly absorbing acidic form of the biradical has a lifetime of 125 ns, with λmax of the difference spectrum with starting material at 320 nm.The strongly absorbing basic form has a lifetime of 62 ns and λmax 325 nm.The pKa in the mixed solvent is 11.8.The pKa in pure water, based on solvent dependence of pKa values for phenols of similar acidity, is estimated as 10.2+/-0.2, essentially identical with a value reported for the acetophenone ketyl monoradical.
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