Fluorescence Lifetimes And Quantum Efficiencies Of Some 1,10-Phenanthrolines
Fluorescence properties of fourteen substituted 1,10-Phenanthrolines were determined using two different solvent systems. Hour different sets of experiments were performed in order to measure fluorescence lifetimes, quantum efficiencies, absorption and corrected fluorescence spectra, oscillator stre...
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| Format: | Others |
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Scholarly Commons
1971
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| Online Access: | https://scholarlycommons.pacific.edu/uop_etds/2911 https://scholarlycommons.pacific.edu/cgi/viewcontent.cgi?article=3910&context=uop_etds |
| Summary: | Fluorescence properties of fourteen substituted 1,10-Phenanthrolines were determined using two different solvent systems. Hour different sets of experiments were performed in order to measure fluorescence lifetimes, quantum efficiencies, absorption and corrected fluorescence spectra, oscillator strengths, and Stoke’s shifts. Two of the phenanthrolines, the 5-Nitro-1,10-Phenanthroline and the 1,10-Phenanthroline-5,6-Dione, did not fluoresce.
A new equation was developed in order to extract the true fluorescence lifetimes τ from the observed fluorescence output f(t), and the lamp decay function I(t). This equation was [see PDF] where “A” was the weight factor or the normalization constant for the appropriate functions. A test of this equation on compounds with known lifetimes gave excellent results.
The experimental results indicated that there was a close relationship between the fluorescence parameters and the effect of different substituents on the different π-electron density positions of the ring. These parameters were also found to increase with an increase of solvent polarity thus indicating an (π, π*) singlet transition in the polar solvents. |
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