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Synthesis of polyarylacetylenes by γ-ray-induced polymerization of terminal alkynes. Nanostructures of ortho-substituted derivatives

Authors

  • Mauro Bassetti,

    Corresponding author
    1. Istituto CNR di Metodologie Chimiche, Sezione Meccanismi di Reazione, and Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro 5, 00185 Roma, Italy
    • Istituto CNR di Metodologie Chimiche, Sezione Meccanismi di Reazione, and Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro 5, 00185 Roma, Italy
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  • Ilaria Fratoddi,

    Corresponding author
    1. Dipartimento di Chimica and Centro delle Nanotecnologie per l'Ingegneria della Sapienza (CNIS), Sapienza Università di Roma, P.le A. Moro 5, 00185 Roma, Italy
    • Dipartimento di Chimica and Centro delle Nanotecnologie per l'Ingegneria della Sapienza (CNIS), Sapienza Università di Roma, P.le A. Moro 5, 00185 Roma, Italy
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  • Laura Lilla,

    1. Istituto CNR di Metodologie Chimiche, Area della Ricerca di Roma, 00016 Monterotondo Stazione (RM), Italy
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  • Chiara Pasquini,

    1. Istituto CNR di Metodologie Chimiche, Sezione Meccanismi di Reazione, and Dipartimento di Chimica, Sapienza Università di Roma, P.le A. Moro 5, 00185 Roma, Italy
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  • Maria Vittoria Russo,

    1. Dipartimento di Chimica and Centro delle Nanotecnologie per l'Ingegneria della Sapienza (CNIS), Sapienza Università di Roma, P.le A. Moro 5, 00185 Roma, Italy
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  • Ornella Ursini

    Corresponding author
    1. Istituto CNR di Metodologie Chimiche, Area della Ricerca di Roma, 00016 Monterotondo Stazione (RM), Italy
    • Istituto CNR di Metodologie Chimiche, Area della Ricerca di Roma, 00016 Monterotondo Stazione (RM), Italy
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Abstract

Terminal aryl alkynes RC6H4C[TRIPLE BOND]CH with substituents of different electronic properties and ring position (R = H, 4-CF3, 4-OMe, 2-CF3, 2-OMe, 2-Me) were exposed to γ-radiation (50–400 kGy) in organic solvents (hexane, 1,4-dioxane, ethylacetate, methanol, tetrahydrofuran), at room temperature. The effects arising from substituent, solvent, dilution, and radiation dose allowed to define the conditions suitable for polymerization, which was favored in methanol at increasing dilution of the alkyne. Ortho-substitution represented the key structural element in the substrate, and the derived polyarylacetylenes were characterized in detail, including gel permeation chromatography, thermal analysis, infrared, NMR, UV–vis, fluorescence, and scanning electron microscope spectroscopy. The results are consistent with the formation of irregular polymers mainly composed of trans-transoid chains. Controlled aggregation of the polymers by means of an osmosis-based procedure in solvent/non-solvent mixtures allowed the formation of nanostructured materials, in particular of hollow nanospheres from THF/water. The methodology sets the basis for the development of γ-rays-induced polymerization of alkynes, in a transition metal catalyst-free environment. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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