ELECTRONIC ABSORPTION PROPERTIES OF SYMMETRICAL DIALKOXYANTHRACENES. LINEAR DICHROISM AND MAGNETIC CIRCULAR DICHROISM

Authors

  • Thierry Brotin,

    1. Université de Bordeaux 1, Laboratoire Associé au CNRS 348, Photophysique et Photochimie Moléculaire, 351 Cours de la Libération, 33405 Talence Cedex, France
    2. Center for Structure and Reactivity, Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, TX 78712–1167, USA
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  • Jacek Waluk,

    1. Center for Structure and Reactivity, Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, TX 78712–1167, USA
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    • †Institute of Physical Chemistry, Polish Academy of Sciences, 01–224 Warsaw, Poland.

  • Jean-Pierre Desvergne,

    Corresponding author
    1. Université de Bordeaux 1, Laboratoire Associé au CNRS 348, Photophysique et Photochimie Moléculaire, 351 Cours de la Libération, 33405 Talence Cedex, France
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  • Henri Bouas-Laurent,

    1. Université de Bordeaux 1, Laboratoire Associé au CNRS 348, Photophysique et Photochimie Moléculaire, 351 Cours de la Libération, 33405 Talence Cedex, France
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  • Josef Michl

    Corresponding author
    1. Center for Structure and Reactivity, Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, TX 78712–1167, USA
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    • §Department of Chemistry and Biochemistry, University of Colorado at Boulder, Campus Box 215, Boulder, CO 80309–0215, USA.


  • *Dedicated to Professor Kurt Schaffner on the occasion of his 60th birthday.

†To whom correspondence should be addressed.

Abstract

Abstract— Linear dichroism (LD) and magnetic circular dichroism (MCD) of symmetrical dialkoxy-anthracenes and some related compounds were recorded in an attempt to elucidate electronic absorption properties and assign the nature of the lowest singlet excited state, recognized to control both the fluorescence and the photodimerization of anthracenes. The spectroscopic measurements proved that the lowest electronic transition is of the 1La type in all the compounds. The peculiar photoreactivity pattern is therefore governed by factors other than an inversion of the order of the 1La and 1Lb states and may be related to electronic density repartition on the different positions of the anthracene nucleus dictated by the position of the electron-donating substituents.

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