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Journal of Chemical Physics / Volume 115 / Issue 12 / ARTICLES / Surfaces, Interfaces, and Materials

J. Chem. Phys. 115, 5625 (2001); http://dx.doi.org/10.1063/1.1397310 (12 pages)

Photophysical and theoretical studies of naphthalene-substituted oligothiophenes

J. Seixas de Melo1, L. M. Silva1, and Masami Kuroda2

1Department of Chemistry (CQC), University of Coimbra, 3004-535 Coimbra, Portugal
2Material Science and Technology Laboratory, Fuji Electric Corporate Research and Development, LTD, Japan

(Received 16 April 2001; accepted 5 July 2001)

A comprehensive photophysical characterization of a new class of naphthalene derivatives of the important α-oligothiophenes (αns) has been undertaken in solution at room (293 K) and low (77 K) temperature. This includes absorption and fluorescence spectra, fluorescence quantum yields (ϕF), and lifetimes (τF), as a function of temperature and solvent. Triplet–triplet absorption spectra and triplet formation quantum yields (ϕT) were also determined. From the above, all the rate constants for the radiative (kF) and radiationless (kIC and kISC) have been calculated. It is shown that the lowest singlet excited state is an allowed π,π∗ state in all solvents. The results show that although the behavior of the oligomers is similar to their parent compounds (αns), significant differences are observed. By comparison of the extinction coefficients of the naph(αns) and the (αns), a good correlation was found between naph(αn) and α(n+1). On the basis of this proposed pairing, a consistent blue-shift was observed in the absorption maxima between the compounds here considered and the reference α-oligothiophenes. This indicates that there is some significant twist between the naphthalene and the αn chromophores. The most favorable inter-ring angle between the two chromophores, naphthalene and αn, was predicted on the basis of comparison with theory. © 2001 American Institute of Physics.

© 2001 American Institute of Physics

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KEYWORDS and PACS

Keywords

organic compounds, fluorescence, triplet state

PACS

  • 33.50.Dq

    Fluorescence and phosphorescence spectra

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1397310

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    E. M. Conwell and H. A. Mizes, Phys. Rev. B 51, 6953 (1995).

    J. Seixas de Melo, L. M. Silva, L. G. Arnaut, and R. S. Becker, J. Chem. Phys. 111, 5427 (1999)JCPSA6000111000012005427000001.

    S. J. Strickler and R. A. Berg, J. Chem. Phys. 37, 814 (1962)JCPSA6000037000004000814000001.

    J. Del Bene and H. H. Jaffe, J. Chem. Phys. 48, 1807 (1968)JCPSA6000048000004001807000001.


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