(1) Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai, 625 021, India;(2) Department of Physics, Mother Teresa Women’s University, Kodaikanal, 624 102, India
Abstract:
Absorption as well as fluorescence emission studies of p-dimethylaminobenzaldehyde (DMABA) in solvents with different polarity have been reported by varying the concentration of
the solute. Dual fluorescence corresponding to the non-polar (NP) and twisted intramolecular charge transfer (TICT) states
has been observed. The optimized geometry of DMABA was evaluated using ab-initio theory at various levels. The optimized geometries
of the hydrogen bonded complexes with the solvent molecules were also calculated with the theory Hartree Fock at the basis
set 6-31+G (HF/6-31+G). The results have been used to understand the structure of the molecule and the spectral changes in
terms of hydrogen bonding and solute–solvent interaction.