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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.43 [2005] >
IJPAP Vol.43(10) [October 2005] >
| 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 10 10-6 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) |
| Source: | IJPAP Vol.43(10) [October 2005]
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