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Emissive Properties and Intramolecular Charge Transfer of Pyrazoloquinoline Derivatives |
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| Authors: | Karl Rechthaler Krystyna Rotkiewicz Andrzej Danel Piotr Tomasik Karen Khatchatryan Gottfried Köhler |
| Institution: | (1) Institut für Theoretische Chemie und Strahlenchemie, University of Vienna, Althanstraf e 14, A-1090 Vienna, Austria;(2) Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, PL-01-224 Warsaw, Poland;(3) H. Ko ataj Agricultural University, al.Mickiewicza 24/28, PL-30-059 Cracow, Poland |
| Abstract: | The fluorescence properties of several pyrazoloquinoline derivatives were performed by stationary as well as by time-resolved spectrosopy. Non-donor-substituted compounds show a high quantum yield; transition dipole moments of absorption and fluorescence as well as experimental and calculated lifetimes are in excellent agreement. The donor-substituted compound DMA-DPPQ exhibits a charge transfer fluorescence in polar solvents. Additionally, dual fluorescence appears in polar protic solvents. The nature of the charge transfer state is discussed with respect to the the TICT model. |
| Keywords: | Pyrazoloquinoline derivatives charge transfer emissive properties |
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