Solvatochromic effect studies on the absorption spectra of 4-((2-ethylphenyl)diazenyl)benzene-1,3-diol and 2-((2-ethylphenyl)diazenyl)benzene-1,3,5-triol molecules

• Published in: International journal of hydrogen energy Vol. 34; no. 12; pp. 5255 - 5259
• Main Authors: Gülseven, Yadigar, Taşal, Erol, Sıdır, İsa, Güngör, Tayyar, Berber, Halil, Öğretir, Cemil
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 01.06.2009; Elsevier
• Subjects: Absorption spectra; Applied sciences; Azoaromatic compounds; Chemical industry and chemicals; Derivatives; Dyes, pigments; Electronic absorption spectra; Electronics; Energy; Exact sciences and technology; Hydrogen bonds; Industrial chemicals; Mathematical models; Natural energy; Regression analysis; Solar energy; Solvatochromic effect; Solvents; Solvent–solute interactions; Spectra; Solvent–solute interactions; Electronic absorption spectra; Solvatochromic effect; Azoaromatic compounds; Solvent effect; Dyes; Solvent-solute interactions; Linear regression; Benzene derivatives; Solvatochromism; Azo compound; Azo dye; Solar energy; Azobenzene
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2008.10.070

The electronic absorption spectra of 4-((2-ethylphenyl)diazenyl)benzene-1,3-diol and 2-((2-ethylphenyl)diazenyl)benzene-1,3,5-triol molecules in the nine different solvent variable electronic characters have been recorded. The solvent dependent maximum absorption band (π–π* transitions) shifts, ν max, were analyzed using a wide range of parameters such as refractive index, dielectric constant and Kamlet–Taft parameters [hydrogen bond donating ability ( α) and hydrogen bond accepting ability ( β)]. The electronic transitions are assigned and the solvent-induced spectral shifts have been analyzed in relation to the different solute–solvent interaction mechanism using computational chemistry. The intermolecular interaction types in the azobenzene derivatives solutions have been established on the basis of a multiple linear regression analysis. The fitting coefficients obtained from this analysis allowed us to estimate the contribution of each type of interactions to the total spectral shifts in the studied solutions.