Electrooptical Absorption Measurements (EOAM) Testify Existence of two Conformers of Prodan and Laurdan with Different Dipole Moments in Equilibrium Ground and Franck-Condon Excited State
| Autor: | N. Roeder, N.A. Nemkovich, Heiner Detert |
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| Rok vydání: | 2015 |
| Předmět: |
Sociology and Political Science
Absorption spectroscopy Clinical Biochemistry Transition dipole moment 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry Molecular physics chemistry.chemical_compound Nuclear magnetic resonance Physics::Atomic Physics Physics::Chemical Physics Spectroscopy Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Clinical Psychology Dipole Excited state Moment (physics) Density functional theory 0210 nano-technology Ground state Laurdan Law Social Sciences (miscellaneous) |
| Zdroj: | Journal of fluorescence. 26(5) |
| ISSN: | 1573-4994 |
| Popis: | The results from the electrooptical absorption measurements (EOAM) on the equilibrium ground and excited Franck-Condon state dipole moments of Prodan and Laurdan in 1,4-dioxane are presented. As follows from experiments Prodan and Laurdan in the equilibrium ground and excited Franck-Condon state have two conformers with considerably different dipole moments. The electrical dipole moments and the transition dipole moment, obtained from the short-wavelength region of the absorption spectrum are parallel. The electrical dipole moments measured at the long-wavelength spectral region are parallel to each other but not parallel to the transition dipole moment m a. The angle θ between the transition dipole moment m a and the dipole moment in the equilibrium ground state μ g of the long-wavelength conformer is about 30(0) for both probes. Obtained results evidence that donor-acceptor pairs of the short-wavelength and long-wavelength conformers are not located on the same axis. Two low-energy conformers of Prodan have been found by density functional theory (DFT) calculations, differing in the orientation of the carbonyl group towards the naphthalene system. |
| Databáze: | OpenAIRE |
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