Stability of hydrogen bonds upon polymerization and color transition of diacetylenes: An FTIR spectroscopy study |
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| Affiliation: | 1. Beykent University, Engineering and Architecture Faculty, Department of Chemical Engineering, Ayazağa, İstanbul, Turkey;2. Malaviya National Institute of Technology (MNIT), Department of Chemical Engineering, Jaipur, Rajasthan, India;3. Bu-Ali Sina University, Faculty of Chemistry, Department of Physical Chemistry, Hamedan, Iran;4. Department of Chemical & Materials Engineering, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia;1. Institut de Minéralogie, Physique des Matériaux et Cosmochimie (IMPMC). Muséum National d''Histoire Naturelle, Université Pierre et Marie Curie, Sorbonne Universités, Centre National de la Recherche Scientifique UMR 7590, IRD 206. 4 place Jussieu, 75 005 Paris, France;2. Institute of Ecology, Friedrich Schiller University Jena, Jena, Germany;3. The German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany |
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| Abstract: | FTIR spectra (400–7500 cm−1) have been recorded for polycrystalline films and single crystals of the diacetylene 4BCMU in the monomer, blue and red polymer states, and of 3BCMU monomer. Particular attention was paid to the amide bands associated to the urethanes in the side groups, which form one-dimensional H-bond linear chains quite similar to those found in peptides and proteins. The positions and strengths of these absorptions are practically unchanged by polymerization or blue to red polymer color transition. This suggests that the H-bond linear chains are the main constitutive interactions in these crystals, and that the conjugated parts must and do “adapt” to the unchanged H-bond lines. No evidence of side group disordering was observed at the irreversible blue to red transition in poly-4BCMU crystal. |
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| Keywords: | H-bond Urethane DA polymerization Color transition |
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