Photophysical behavior of norharmane related to proximity effect

6533b85efe1ef96bd12bfaa0

RESEARCH PRODUCT

Photophysical behavior of norharmane related to proximity effect

I. Zabala A. Olba Francisco Tomás

subject

Physics::Biological Physics Quantitative Biology::Biomolecules Chemistry Biophysics General Chemistry Condensed Matter Physics Polarization (waves)Photochemistry Biochemistry Fluorescence Atomic and Molecular Physics and Optics Molecular electronic transition Condensed Matter::Soft Condensed Matter Solvent Vibronic coupling Excited state Polar Singlet state Physics::Chemical Physics

description

Abstract Solvent and temperature effects of fluorescence and its polarization characteristics for norharmane were studied. From the results obtained it is concluded that the fluorescent state changes from the φφ ∗ -type in a polar solvent (EPA) to nφ ∗ -type in a nonpolar solvent (MC), and also that lowest singlet excited states (φφ ∗ -type and nφ ∗ -type) interact by vibronic coupling. In the nonpolar solvent (MC) the lowest singlet excited states are very close in energy and consequently the vibronic coupling is stronger. At high temperatures, in a nonpolar solvent (MC), the emission is from both the φφ ∗ - and nφ ∗ -states due to thermal equilibration, while at low temperatures the emission is only from the lowest singlet state. This agrees with the red shift observed in this solvent at low temperatures.

year	journal	country	edition	language
1990-08-01	Journal of Luminescence

https://doi.org/10.1016/0022-2313(90)90055-g

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