The long-wavelength nπ* phosphorescence spectra of p-quinones in polycrystalline solutions at 77 K

摘要: Besides the usual nπ* phosphorescence spectra, broad, long-wavelength spectra are observed in normal paraffine solutions, such as a heptane solution, of 1,4-naphthoquinone, and benzene solution 5,14 : 7,12-pentacenediquinone at 77 K. The energy difference between two ca. 750 980 cm−1 respectively. intensity relative to short-wavelength becomes weaker with decreases concentrations quinones, lifetimes shorter than those spectra. These assigned quinone aggregates. excitation these phosphorescences have also been obtained. An explanation above red-shift aggregates is presented; it, state corresponds triplet excimer state.