title: Effect of solvent polarity on the fluorescence quenching of biologically active 5BAMC by aniline in binary solvent mixtures.
abstract: The fluorescence quenching of 5, 6-benzo-4-azidomethyl coumarin (5BAMC) by aniline have been carried in different solvent mixtures of benzene (BN) and acetonitrile (AN) at room temperature by steady state fluorescence measurements. The quenching is found to be appreciable and a positive deviation from linearity was observed in the Stern-Volmer plot for the fluorophore in all the solvent mixtures. Various parameters for the quenching process have been determined using the extended S-V equation and have been found to be dependent on the solvent polarity. Further, with the use of finite sink approximation model, it is concluded that the bimolecular reactions quenching reactions are diffusion limited, and the distance parameter R' and mutual diffusion coefficient D are estimated independently.
authors.affiliation: Department of Physics, M S Ramaiah Institute of Technology, Bangalore, 560054, Karnataka, India. melavanki74@rediffmail.com
authors.forename: Raveendra M
authors.initials: RM
authors.lastname: Melavanki
authors.forename: Raviraj A
authors.initials: RA
authors.lastname: Kusanur
authors.forename: Jagadish S
authors.initials: JS
authors.lastname: Kadadevaramath
authors.forename: Manohar V
authors.initials: MV
authors.lastname: Kulkarni
mesh_terms: D000097:Acetonitriles / Q000737:chemistry*; D000814:Aniline Compounds / Q000737:chemistry*; D001554:Benzene / Q000737:chemistry*; D003374:Coumarins / Q000737:chemistry*; D004058:Diffusion; D005453:Fluorescence; D012997:Solvents / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: C556863:5,6-benzo-4-azidomethyl coumarin; D000097:Acetonitriles; D000814:Aniline Compounds; D003374:Coumarins; D012997:Solvents; D001554:Benzene; C023650:aniline; C032159:acetonitrile
references.citation: Spectrochim Acta A Mol Biomol Spectrosc. 2001 Jan;57(1):41-7
references.pmid: 11209865
references.citation: J Am Chem Soc. 1948 Feb;70(2):717-21
references.pmid: 18907778