The association behavior between Acid-Base indicators in buffered aqueous solution (pH = 4) has been studied by UV–Vis spectroscopy technique at room temperature. The spectroscopic results show that association are formed evidenced by highly red shift to lmax = 485nm and large hypo-chromic shift in absorbance signal upon addition of ago dye. The electronic absorption spectra represented by broadening bands and lack of isosbestic point that indicate of formation of higher order dye aggregates from the type J-aggregate as results as change of the pH of the medium were discussed according to exciton kasha theory.
Keyword: Acid-Base Indicators; Electronic Absorption Spectrum; Buffer Solution; Lack of Isosbestic Point; Higher Aggregates.
دراسة سلوك الترابط بين أدلة الحامض والقاعدة في وسط حامضي باستخدام تقنية الأشعة المرئية
Sokaina Saad Hemdan
Asma Mansur Al Jebaly
Fatma Khairallah Ali
Chemistry Department || Factually of Science and Art El Marj || Benghazi University || El Marj || Libya