Title
Azo-group dihedral angle torsion dependence on temperature: A theorerical-experimental study
Abbreviated Journal Title
Chem. Phys. Lett.
Keywords
2-PHOTON ABSORPTION; AZOAROMATIC COMPOUNDS; AZOBENZENE; PHOTOISOMERIZATION; FILMS; DISPERSE-RED-1; SPECTROSCOPY; CHROMOPHORES; MOLECULES; MECHANISM; Chemistry, Physical; Physics, Atomic, Molecular & Chemical
Abstract
Quantum chemical calculations were carried out to explain the observed shifts in the absorption spectrum of different azo-aromatic compounds due to changes in the dihedral angle of the azo-group. Our results reveal that the pi-pi* transition presents a hypsochromic shift and an oscillator strength drop upon increase of the dihedral angle. Nevertheless, the pi-pi* transition exhibits the opposite behavior. This effect is attributed to the reduction in the pi-electron conjugation length of the molecule. Experimentally, we performed temperature dependence measurements of the linear absorption spectrum. Both the theoretical and experimental results demonstrate that small energy changes are mirrored in the electronic transitions of conjugated linear molecules. (C) 2010 Elsevier B.V. All rights reserved.
Journal Title
Chemical Physics Letters
Volume
487
Issue/Number
4-6
Publication Date
1-1-2010
Document Type
Article
Language
English
First Page
226
Last Page
231
WOS Identifier
ISSN
0009-2614
Recommended Citation
"Azo-group dihedral angle torsion dependence on temperature: A theorerical-experimental study" (2010). Faculty Bibliography 2010s. 89.
https://stars.library.ucf.edu/facultybib2010/89
Comments
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