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Influence of local excitation of octupolar Oligophenylenevinylenes on their dipole moments

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Journal of Applied Spectroscopy Aims and scope

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 g  = 6.1∙10–30 and 3.4∙10–30 C∙m in the equilibrium ground state and the increased values ∆ a μ = 11.9∙10–30 and 8.2∙10–30 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 ∆ a μ to change significantly.

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Authors and Affiliations

  1. B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost’ Ave., Minsk, 220072, Belarus

    N. A. Nemkovich & Yu. V. Kruchenok

  2. Institute of Organic Chemistry, J. Gutenberg University of Mainz, Mainz, Germany

    H. Detert & V. Schmitt

Authors
  1. N. A. Nemkovich
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  2. H. Detert
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  3. V. Schmitt
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  4. Yu. V. Kruchenok
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Correspondence to N. A. Nemkovich.

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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 79, No. 3, pp. 375–381, May–June, 2012.

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Nemkovich, N.A., Detert, H., Schmitt, V. et al. Influence of local excitation of octupolar Oligophenylenevinylenes on their dipole moments. J Appl Spectrosc 79, 353–359 (2012). https://doi.org/10.1007/s10812-012-9608-0

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  • DOI: https://doi.org/10.1007/s10812-012-9608-0

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