Intensity Enhancement Caused by Complex Formation between Pyrene and Alcohols

The enhancement of the weak 0-0 band in the absorption spectrum of pyrene has been observed using various mixtures of cyclohexane and alcohols. The relations of the absorption coefficients with the alcohol concentrations have been studied on the assumption of 1:1 complex formation between pyrene and alcohols. The association constants for the hydrogen-bonded complexes have been estimated to be of a reasonable order of magnitude(0.1–0.4 mol−1 dm3).