TITLE

Influence of local excitation of octupolar Oligophenylenevinylenes on their dipole moments

AUTHOR(S)
Nemkovich, N.; Detert, H.; Schmitt, V.; Kruchenok, Yu.
PUB. DATE
July 2012
SOURCE
Journal of Applied Spectroscopy;Jul2012, Vol. 79 Issue 3, p353
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Absorption and fluorescence spectra of octupolar centrosymmetric oligophenylenevinylene dyes (E,E)-bis[2-(4-hexyloxyphenyl)ethenyl]-(E,E)-3,6-bis-[2-(4-N,N-dipropylaminophenyl)ethenyl]pyrazine and (E,E,E,E)-2,3,5,6- tetra-[2-(4-hexyloxyphenyl)ethenyl]pyrazine were measured in various solvents. An electro-optical absorption method was used to determine their dipole moments as μ = 6.1∙10 and 3.4∙10 C∙m in the equilibrium ground state and the increased values ∆ μ = 11.9∙10 and 8.2∙10 C∙m upon excitation into a Franck-Condon state. Quantum-chemical calculations showed that the molecules had non-planar configurations. The π, π-conjugated system was localized on the most planar part of the molecule that was responsible for light absorption in the range 300-450 nm due to a change in the geometry of the molecules in the ground state. Localized excitation of the molecules caused their dipole moments ∆ μ to change significantly.
ACCESSION #
79824121

 

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