In addition to the anthracene-type emission, 9, 9′-dianthrylmethanol (A1OHA) shows a structureless long-wavelength fluorescence band, which undergoes a red-shift as well as an increase of its relative intensity with increasing solvent polarity. A parallel intramolecular fluorescence quenching process is investigated by the study of two reference compounds, 9- hydroxymethylanthracene and 9-ethoxymethylanthracene. In spite of the lack of the ...