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Synthesis, characterization and optical properties of a series of copolymers bearing 1-ethynylpyrene and ethynylbenzene units

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Abstract

A novel series of copolymers were obtained from the copolymerization of 1-ethynylpyrene (EP) (known as pyrenylacetylene) and ethynylbenzene (EB) (named also phenylacetylene) with WCl6 as catalyst and toluene as solvent, using different monomer molar ratios EP/EB (80:20, 60:40, 50:50; 40:60, 20:80). The optical properties of the obtained copolymers Poly(EP-co-EB) were determined by absorption and fluorescence spectroscopy. Absorption spectra of the copolymers Poly(EP-co-EB) showed that copolymers containing phenylacetylene units possess a lower degree of conjugation than the homopolymer trans-poly(1-ethynylpyrene) (trans-PEP), since they showed a twisted conformation. These results were confirmed by emission spectroscopy showing the formation of excimers for those copolymers containing high pyrene content.

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Acknowledgments

We are grateful to Miguel Angel Canseco and Gerardo Cedillo for their assistance with FTIR and NMR spectroscopies. We are also thankful to Instituto Tecnológico de Toluca for its laboratories and resources. Juan Carlos Carranza-Cruz is grateful to CONACyT for his scholarship. This work was financially supported by CONACyT (Projects 253155 and 279380) and PAPIIT-DGAPA (Project IN101119).

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Authors and Affiliations

  1. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria, C.P. 04510, México, D.F., México

    Pasquale Porcu, Andrea García-Rodriguez & Ernesto Rivera

  2. Tecnológico Nacional de México, Instituto Tecnológico de Toluca, Av. Tecnológico S/N Col. Agrícola Bellavista, C.P. 52149, Metepec, México

    Juan Carlos Carranza-Cruz & Javier Illescas

Authors
  1. Pasquale Porcu
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  2. Andrea García-Rodriguez
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  3. Juan Carlos Carranza-Cruz
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  4. Javier Illescas
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  5. Ernesto Rivera
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Porcu, P., García-Rodriguez, A., Carranza-Cruz, J.C. et al. Synthesis, characterization and optical properties of a series of copolymers bearing 1-ethynylpyrene and ethynylbenzene units. MRS Advances 5, 3215–3225 (2020). https://doi.org/10.1557/adv.2020.428

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