Photophysical and theoretical studies on newly synthesized N,N-diphenylamine based azo dye


Aksungur T., Arslan O., SEFEROĞLU N. , SEFEROĞLU Z.

JOURNAL OF MOLECULAR STRUCTURE, vol.1099, pp.543-550, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 1099
  • Publication Date: 2015
  • Doi Number: 10.1016/j.molstruc.2015.07.010
  • Title of Journal : JOURNAL OF MOLECULAR STRUCTURE
  • Page Numbers: pp.543-550
  • Keywords: Diphenylamine based azo dye, UV-Vis, Tautomerism, DFT, Acidochromism, Non-linear optic (NLO), MONOAZO DISPERSE DYES, SPECTRAL PROPERTIES, THERMAL-STABILITY, AZOMETHINE DYES, ORANGE 1, DENSITY, DNA, APPROXIMATION, TAUTOMERISM, MOLECULES

Abstract

The azo-hydrazone tautomerism, solvatochromism and halochromism in diphenylamine based azo dye ((E)-1-(4-((4-(phenylamino)phenyl)diazenyl)phenyl)ethanone, DPA) were examined. The absorption wavelengths of the dye in different solvents were in the range 429-544 nm. The compound exhibits positive solvatochromism as the absorption band is red shifted with increasing solvent polarity. In addition, the absorption properties of the dye change drastically upon acidification, as the protonation of beta-nitrogen atom of the azo group increases the donor-acceptor interplay of the pi system. The experimental results are fully supported by DFT and TD-DFT calculations. Moreover, nonlinear optical properties (NLO) were also obtained by the theoretically predicted values of dipole moment (mu), polarizability (alpha) and first hyperpolarizability (beta). (C) 2015 Elsevier B.V. All rights reserved.