Absorption and polarization spectra of polynuclear p-quinones

Low-Lying Electronic States, Spectroscopy, and Photophysics of Linear Para Acenequinones

“…The emission spectra of Q[2,l] and Q [2,2] were obtained first by Zander,72 but Shcheglova and Lesnenko134 criticized the assignments by Zander and stated that the Ti state is of (jr,jr*) type. The polarization spectra of the phosphorescence of Q[2,0], Q[2,l], and Q[2,2] were measured by Novak et al 28 and by Nepras and Novak85 who also treated the emission as originating from the Ti(;r,?r*) state. The phosphorescence spectra of Q[2,0], Q[2,l], and Q [2,2] in a rigid glass at 77 K are displayed in Figure 6.…”

Spectral behaviour and solvent effects of some aminoanthraquinone dyes

“…orgunic solvents The uv and visible absorption spectra of AAQ dyes (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) in ethanol display six absorption bands A, B,C, D, E,andFlocatednear210,230,245,275, 308, and 4.50-560nm respectively. The band A suffers a blue shift as the polarity of the solvent increases and disappears in HCl solution.…”

“…Investigations of the electronic absorption spectra of some anthraquinone derivatives have been reported (1)(2)(3)(4)(5). The effect of solvents on the absorption spectra of hydroxy-and aminoanthraquinone dyes have also been studied (6)(7)(8).…”

“…The effect of solvents on the absorption spectra of hydroxy-and aminoanthraquinone dyes have also been studied (6)(7)(8). In addition, the electronic absorption spectra of anthraquinone and its amino derivatives have been studied (3,9,10) by means of the polarized absorption spectra on stretched PVA sheets and by means of theoretical calculations.…”