International Journal of Life science and Pharma Reviews (IJLPR)  
   
 
International Journal of Life science and Pharma Research (IJLPR)
Life Science
Volume 8 Issue 3, July - September 2018    Pages:16-23
EFFECT OF HYDROGEN BONDING ON FLUORESCENCE QUENCHING OF QUINOLIN-8-OL - ANALYSIS USING NEGATIVE STERN-VOLMER PLOTS

V.T. MUTTANNAVAR, RAVEENDRA.MELAVANKI*, KALPANA SHARMA, P. BHAVYA, RAVIRAJ. KUSANUR AND L. R. NAIK
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DOI: http://dx.doi.org/10.22376/ijpbs/lpr.2018.8.3.L16-23
Abstract:
Photophysics of fluorescent organic compounds give a better knowledge of the excited state properties which in turn will help in the design of newer molecules and understanding their performance in specific applications. Here we present the fluorescence quenching study of a Quinolin-8-ol (QO) in toluene and butanol solvents by steady state fluorescence measurements. Anilineis the quencher. Negative deviation in the Stern – Volmer (S-V) plots has been observed with moderate quencher concentration. The downward curvature in the S-V plot is interpreted in terms of existence of different conformers of the solute in the ground state. The formation of intermolecular and intra molecular hydrogen bonding is found to be responsible for the conformational changes in the ground state of the solute. Quenching data is analyzed by modified Stern-Volmer equation or Lehrer equation.
Keywords: Quinolin-8-ol (QO), fluorescence quenching, modified Stern–Volmer (Lehrer) equations and hydrogen bonding.
 
 
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