Solvent effects on non-linear optical properties (NLO) and intramolecular charge transfer (ICT) characteristics of disperse red 19 dye

Abstract

The electronic absorption spectra of disperse red 19 (DR19) dye were used to calculate non-linear optical properties (NLO) and intramolecular charge transfer (ICT) characteristics in four different polarity solvents. DR19 dye shows good NLO responses with high values of NLO parameters (αCT = 1.65 × 10-23 e.s.u., βCT = 57.60 × 10-29 e.s.u. and γCT = 0.16 × 10-32 e.s.u.), in methanol medium. Then, using the NLO parameters the generalized Mulliken-Hush analysis was performed in order to evaluate the ICT characteristics responsible for the nonlinear optic character of this azo disperse red dye. The previous findings (J. Phys. Chem. A 18 (1997) 3222-3226, Song et al. [1]) and results from the present study indicate that DR19 dye is a material showing good NLO properties and that find applications in various fields.