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RESEARCH PRODUCT
Photophysical behavior of 3-methylquinoline and 3-bromoquinoline
Francisco TomásF. MárquezI. Zabalasubject
Absorption spectroscopyChemistryBiophysicsGeneral ChemistryCondensed Matter PhysicsPhotochemistryBiochemistryAtomic and Molecular Physics and OpticsSolventchemistry.chemical_compoundMoleculeDegree of polarizationMethylcyclohexaneTriplet statePolarization (electrochemistry)Phosphorescencedescription
Abstract The phosphorescence emission and excitation spectra and their polarizations have been studied for 3-methylquinoline and 3-bromoquinoline in methylcyclohexane and ethanol glasses at 77 K. From the results obtained in 3-methylquinoline (τp = 1.30 s in ethanol, τp = 1.05 s in methylcyclohexane and the out-of-plane polarization) it is concluded that the emission originates from a triplet state of 3ππ∗ character. In 3-bromoquinoline, the phosphorescence lifetimes (ca. 8 ms in a non-polar solvent and 15 ms in a polar solvent) and the negative degree of polarization indicate an emitting state of ππ∗ character that is strongly coupled to a higher-lying triplet state of the nπ∗ type. The most likely phosphorescence mechanisms for both molecules are proposed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1992-08-01 | Journal of Luminescence |