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Fluorescence Study of Energy Transfer in PMMA Polymers with Pendant Oligo-Phenylene-Ethynylenes

Authors

  • Johann Schäfer,

    1. Institute of Photonic Technology Jena e.V. Albert-Einstein-Str. 9, 07745 Jena (Germany), Fax: (+49) 3641-206399
    2. Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Humboldtstr. 10, 07743 Jena (Germany)
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  • Alexander Breul,

    1. Friedrich-Schiller-University Jena, Laboratory of Organic and Macromolecular Chemistry, Humboldtstr. 10, 07743 Jena (Germany)
    2. Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Humboldtstr. 10, 07743 Jena (Germany)
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  • Dr. Eckard Birckner,

    1. Institute of Physical Chemistry (IPC) and Abbe Center of Photonics (ACP), Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena (Germany)
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  • Dr. Martin D. Hager,

    1. Friedrich-Schiller-University Jena, Laboratory of Organic and Macromolecular Chemistry, Humboldtstr. 10, 07743 Jena (Germany)
    2. Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Humboldtstr. 10, 07743 Jena (Germany)
    3. Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven (Netherlands)
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  • Prof. Dr. Ulrich S. Schubert,

    1. Friedrich-Schiller-University Jena, Laboratory of Organic and Macromolecular Chemistry, Humboldtstr. 10, 07743 Jena (Germany)
    2. Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Humboldtstr. 10, 07743 Jena (Germany)
    3. Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven (Netherlands)
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  • Prof. Dr. Jürgen Popp,

    1. Institute of Photonic Technology Jena e.V. Albert-Einstein-Str. 9, 07745 Jena (Germany), Fax: (+49) 3641-206399
    2. Institute of Physical Chemistry (IPC) and Abbe Center of Photonics (ACP), Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena (Germany)
    3. Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Humboldtstr. 10, 07743 Jena (Germany)
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  • Prof. Dr. Benjamin Dietzek

    Corresponding author
    1. Institute of Photonic Technology Jena e.V. Albert-Einstein-Str. 9, 07745 Jena (Germany), Fax: (+49) 3641-206399
    2. Institute of Physical Chemistry (IPC) and Abbe Center of Photonics (ACP), Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena (Germany)
    3. Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Humboldtstr. 10, 07743 Jena (Germany)
    • Institute of Photonic Technology Jena e.V. Albert-Einstein-Str. 9, 07745 Jena (Germany), Fax: (+49) 3641-206399
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  • PMMA: Poly(methyl methacrylate)

Abstract

A spectroscopic characterization of polymers containing rigid π-conjugated oligo(phenyleneethynylene) chromophores as well as oligo(phenyleneethynylene) and methyl methacrylate is presented. The polymers exhibit molar masses of up to 15 000 g mol−1 and a degree of polymerization between 22 and 80. Emission measurements of the monomeric and polymeric species show that radiative as well as nonradiative rates are influenced by the degree of polymerization due to intramolecular interactions of chromophores pendant to the polymer backbone. Time-resolved emission anisotropy measurements suggest that energy migrates within the polymers. Steady-state emission anisotropy measurements also point to energy migration. Additionally, two oligo(phenyleneethynylene)s with different sizes of the conjugated system are copolymerized in order to enable energy trapping due to energy transfer. The shortened energy-donor fluorescence lifetime within the donor–acceptor copolymers suggest energy transfer. Depending on the degree of polymerization, dispersion of the donor fluorescence lifetime is observed.

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