ChemInform Abstract: RELAXATION MECHANISM OF EXCITED ACRIDINE IN NONREACTIVE SOLVENTS

A Theoretical Insight into the Photophysics of Acridine

“…The main peaks observed in the lowest band at 3.27, 3.50, and 3.66 eV do not change their position on different solvents. 7,[10][11][12][19][20][21] Considering the vibrationally structured character of the 1 L b band in other related systems, 45 it is reasonable to assign these peaks to the vibrational progressions on the 1 1 B 2 state. It has a computed dipole moment of magnitude similar to that of the ground state.…”

“…Two main bands form the measured absorption spectrum of acridine. ,, A low-lying and structured band is observed near the visible region, starting at 3.2 eV and peaking at 3.5 eV ,− ,− being considered as a mixture of the 1 L b and 1 L a π → π* states of Platt's nomenclature, long and short-axis polarized, respectively. , The lowest n → π* excited state has been proposed to lie in the same energy region, although the detection of the state has been problematic 13 because of the overlap with the π → π* features. The influence of the environment, temperature, and protonation on the band shape and position have been extensively studied .…”