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Title: Photo physical properties of 8-hydroxy quinoline
Authors: Naik, L R
Math, N N
Keywords: Absorption;Fluorescence excitation;Emission spectra;H-bonding complexes;Monomers;Dimers
Issue Date: Oct-2005
Publisher: CSIR
IPC Code: C09K9/00
Abstract: The steady state absorption, fluorescence excitation and emission spectra of 8-hydroxy quinoline (8-HQ) have been studied in a wide range of solvents of varying dipole moments. The dependence of fluorescence emission on concentration and excitation wavelength indicates the existence of two different emitting species in equilibrium. The fluorescence quantum yield exhibits a substantial solvent dependence. The high quantum yield observed in polar aprotic solvents such as dimethyl formamide and dimethyl sulphoxide might be due to severe overlapping of electronic transitions of various species/single species. The fluorescence and emission spectra of 8-HQ in various solvents exhibit dual fluorescence in the region 330-410 nm. The fluorescence emission of 8-HQ in pure dimethyl formamide, dimethyl sulphoxide and propanol solvents measured as a function of concentration in the range 1010-6 to 510-4 mol dm-3 displays a clear iso-emissive point at 395 nm while in binary mixture of propanol and dimethyl formamide, iso-emissive point is obtained around 410 nm for excitation wavelength of 290 nm. This finding reveals the formation of two stoichiometric hydrogen-bonding complexes, namely, 1:1 and 1:2 complexes in the ground and excited state.
Page(s): 743-749
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(10) [October 2005]

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