The first UV absorption band of l-tryptophan is not due to two simultaneous orthogonal electronic transitions differing in the dipole moment

Based on UV/Vis spectroscopic evidence obtained in this work, the first band in the absorption spectrum of l-tryptophan is largely due to a single electronic transition from the ground state to the (1)Lb excited state. However, emission spectra of this compound recorded at a variable temperature in...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2016-06, Vol.18 (22), p.15170-15176
Main Author: Catalan, Javier
Format: Article
Language:English
Subjects:
1-Butanol - chemistry
Absorption spectra
Anisotropy
Band spectra
Diethyl ether
Dipole moment
Electrons
Emission
Ethanol
Ethyl alcohol
Excitation spectra
Spectrometry, Fluorescence
Spectrophotometry, Ultraviolet
Temperature
Tryptophan - chemistry
Ultraviolet Rays
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Summary:Based on UV/Vis spectroscopic evidence obtained in this work, the first band in the absorption spectrum of l-tryptophan is largely due to a single electronic transition from the ground state to the (1)Lb excited state. However, emission spectra of this compound recorded at a variable temperature in ethanol, n-butanol and diethyl ether are structureless and considerably red-shifted at room temperature; also, lowering the temperature causes the emission to become structured and to undergo such a strong blue shift that it appears to be due to the (1)Lb state of the compound. Based on these findings, the formation (from the excited (1)Lb state) of the excited state responsible for the structureless, markedly red-shifted emission in l-tryptophan is strongly dependent not only on the viscosity of the medium, but also on its dipolarity.
ISSN:1463-9076
1463-9084
DOI:10.1039/c6cp00790b