Effect of Solvent Polarity on the Quantum Yield of Acriflavine Molecule

S. Abdul Whaab, Waleed; M. Jawad, Yaqoob; Tareq Hamad, Hadeel

	Effect of Solvent Polarity on the Quantum Yield of Acriflavine Molecule
Diyala Journal For Pure Science
Article 1, Volume 11, Issue 4, 2015, Pages 142-150
Authors
Waleed S. Abdul Whaab; Yaqoob M. Jawad; Hadeel Tareq Hamad
Abstract
The absorption and fluorescence spectra have been studied and measured for Acriflavine (AF) solution which dissolved in polar solvents as a function of concentration and solvent at excitation wavelength (λex= 414nm) . The quantum yield (Фfm ) , the Radiative fluorescence lifetime (τFM ) , rate parameter of Radiative (KFM) and non-Radiative processes (KIM) are be calculated . Where the quantum yield be found equal to (Фfm =0.84) and ( Фfm = 0.83) for Acriflavine (AF) solution dissolved in N-N-dimethyl formamide (Dmf) and dimethyl sulphoxide (DMSO)at concentration (1x10-5M ) , respectively. But the quantum yield of Acriflavine (AF) in water is equal to ( Фfm = 0.81) at same concentration . This different in the values of quantum yield refers to the effect of polarity and to the intermolecular charge transfer phenomena (ICT) between the amine group and the aromatic ring , since when the polarity of solvent increasing leads to decreasing in the intensity of the fluorescence spectra , also a shift of fluorescence spectrum occurs towards the longer wavelength (redshift) , and this lead to decrease the quantum yield value . The quantum yield measurement was calculated relative to standard compound of Rhodamine B with quantum efficiency (qFM = 0.97) at same excitation wavelength (λex= 414nm) . The all furthermore measurements are be performed at room temperature .
Keywords
Effect of Solvent Polarity on the Quantum Yield

Statistics Article View: 180 PDF Download: 117