title: Solvent effect on the electronic spectra of azine dyes under alkaline condition.
abstract: Thiazine dye, methylene blue (MB), oxazine dye, nile blue (NB), and phenazine-based dye, neutral red (NR), bear a similar basic dye skeleton with a distinctively different central heteroatom. All of them are extracted into nonpolar organic solvent from alkaline solution. The role of the heteroatom on the respective dye skeletons and redox potentials of the dyes has been examined to signature the stability of the species in organic solvent and the results have been substantiated through geometry optimization and wave function analysis at the density functional theory level. The effect of solvent polarity on the electronic absorption spectra of the three nonionic benzenoid species has been investigated with an intention to investigate the solvatochromic behavior of these compounds.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India.
authors.forename: Soumen
authors.initials: S
authors.lastname: Basu
authors.forename: Sudipa
authors.initials: S
authors.lastname: Panigrahi
authors.forename: Snigdhamayee
authors.initials: S
authors.lastname: Praharaj
authors.forename: Sujit Kumar
authors.initials: SK
authors.lastname: Ghosh
authors.forename: Surojit
authors.initials: S
authors.lastname: Pande
authors.forename: Subhra
authors.initials: S
authors.lastname: Jana
authors.forename: Anjali
authors.initials: A
authors.lastname: Pal
authors.forename: Tarasankar
authors.initials: T
authors.lastname: Pal