Excited state characteristics of acridine dyes: acriflavine and acridine orange.

Spectrochim Acta A Mol Biomol Spectrosc

Department of Applied Physics, Guru Jambeshwar University, Hisar, India.

Published: June 2003

The magnitude of the Stokes shift (frequency shifts in absorption and fluorescence spectra) is observed on changing the solvents and further has been used to calculate experimentally the dipole moments (ground state and excited state) of acriflavine and acridine orange dye molecules. Theoretically, dipole moments are calculated using PM 3 Model. The dipole moments of excited states, for both molecules investigated here, are higher than the corresponding values in the ground states. The increase in the dipole moment has been explained in terms of the nature of the excited state. Acriflavine dye overcomes the non-lasing behaviour of acridine orange due to quaternization of the central nitrogen atom.

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http://dx.doi.org/10.1016/s1386-1425(02)00440-7DOI Listing

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