Author/Authors :
Alarfaj, Nawal A. King Saud University - College of Science - Chemistry Department,Women Student Medical Studies Sciences Sections, Saudi Arabia , El Khiate, Zinat M. King Saud University - College of Science - Chemistry Department,Women Student Medical Studies Sciences Sections, Saudi Arabia , Moussa, Eglal A. King Saud University - College of Science - Chemistry Department,Women Student Medical Studies Sciences Sections, Saudi Arabia
Abstract :
The electronic absorption spectra of different acid dyes,Crocein Orange G, Acid Alizarin N and Acid Orange 10 have beeninvestigated in aqueous and non-aqueous solutions. Also spectrophotometricresults on the aggregation of the studied dyes in presenceof electrolytes are presented.As the concentration of the dye increases the absorption spectrashifts to shorter wavelengths, this behaviour has been attributed to theformation of high aggregates. The larger wavelength, almost workedin dilute solutions, is typical of the monomeric dye. The aggregationof these dyes was studied quantitatively using the Maximum SlopeMethod. The investigated three dyes are aggregated at room temperaturewith an average aggregation number.
