The energies of the first band in the electronic absorption spectra of a series of diphenylmethyl cations have been found to correlate with the Taft substituent constants, σ*. This has led to the prediction of σ* values for the cyclopropyl, hydroxy-, propynyl, and carboxy-groups.
A. Atkinson, A. C. Hopkinson and E. Lee-Ruff, J. Chem. Soc., Perkin Trans. 2, 1972, 1854 DOI: 10.1039/P29720001854
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