پديدآورندگان :
Ghanadzadeh Gilani Ali aggilani@gmail.com Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran; Department of Chemistry, University Campus 2, University of Guilan, Rasht, Iran; , Moradi Rufchahi E.O. Department of Chemistry, Faculty of Science, Lahijan Branch, Islamic Azad University, Lahijan, Iran , Ghasemi S.H. Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran , Taghvaei Vahide Department of Chemistry, University Campus 2, University of Guilan, Rasht, Iran
چكيده فارسي :
Spectral characteristics of some hydroxy azoquinolin dyes with different substituents attached to the para-position on benzene ring were investigated in various environments. Analysis of the spectral data was used to determine the azo and hydrazone forms in protic and aprotic solvents with various polarity and polarizability. As the tautomeric equilibrium strongly depends on the nature of the media and solute-solvent interactions, the spectral shifts and the nature of solutesolvent interactions were described using Kamlet-Taft and Katritzky multiparameter polarity scales. Influence of acid and base on the absorption spectra of the dyes was also examined. Ionization constants (pKa) for these dyes were determined in ethanol-water media (1:1) at room temperature.
