TY - JOUR ID - TI - Effect of solvent polarity on the fluorescence properties of )Acriflavine( molecular تأثير قطبية المذيب على خصائص الفلورة لجزيئة (الاكريفلافين) AU - Assi. Lect. Hadeel Tareq Hamad AU - Assi. Lect.Yaqoob M. Jawad AU - Dr. Asmaa Satar Jeeiad Mheesin Al-Ragehey PY - 2015 VL - 21 IS - 89 /علمي SP - 197 EP - 204 JO - journal of the college of basic education مجلة كلية التربية الاساسية SN - 18157467 27068536 AB -

Keywords:Absorption and fluorescence spectra, Acriflavine molecular, Polarity, Wavelength, N-N-dimethyl formamide (Dmf), Dimethyl sulphoxide (Dmso), Concentration, Stokes shift and Redshift.Abstract: The absorption and fluorescence spectra have been studied and measured for Acriflavine (AF) solution which dissolved in [N-N-dimethyl formamide (Dmf) , dimethyl sulphoxide (Dmso) and water] solvents as a function of concentration and solvent at excitation wavelength (λex= 414nm) . Have been calculated peaks the fluorescence spectra of Acriflavine (AF) solution dissolved in N-N-dimethyl formamide (Dmf) and dimethyl sulphoxide (Dmso) at concentration (1x10-5M ) , and found that it is equal to (λmax= 497 ) ، (λmax= 501) and ( λmax= 505), respectively. Also been calculated the value stokes shift of these peaks found to be equal to (1292.5) ، (1316.5) and (2469.7) , respectively. Where we note that (stokes shift) shifted peak of fluorescence spectra towards the longer wavelength (redshift) increases with increase solvent polarity . The increase of solvents polarity lead to decrease in the intensity of the fluorescence spectra . All measurement were at room temperature . (1). Introduction: Many studies have been reported for the Acriflavine molecule, such as M. Maeda in (1984) has been used the acriflavine as active medium for dye lasers[1]. Carlos M. Previtali in (1995) investigated the solvent effects on the rate constant and activation parameters of several intermolecular electron transfer reactions[2]. Vijay K. Sharma et.al. in (2003) study that has been shown the magnitude of the Stokes shift ( frequency shifts in absorption and fluorescence spectra) is observed on changing the solvents and further has been used to calculate experimentally the dipole moments (ground state and excited state) of acriflavine and acridine orange dye ER -