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    Polymerization of Modified Diacetylenes in Langmuir Films

    Year: 2000

    Journal: Langmuir 2000, 16, 3337-3344, 20111221

    Authors: A. S. Alekseev, T. Viitala,* I. N. Domnin, I. M. Koshkina, A. A. Nikitenko, and J. Peltonen*

    Organizations: General Physics Institute, Russian Academy of Sciences, Vavilov Street 38, 117942 Moscow, Russian Federation, Department of Physical Chemistry, Åbo Akademi University, Porthansgatan 3-5, FIN-20500 Turku, Finland, and Institute of Chemistry, St. Petersburg University, University pr. 2, 198904 St. Petersburg, Peterhof, Russian Federation

    The polymerization of a series of diacetylene Langmuir monolayers modified in the hydrophobic as well as in the hydrophilic part of the molecule was studied by measuring the kinetic changes of the mean molecular area and UV-vis spectra. The polymerization properties of the monolayers were dependent on the position of the diacetylenic unit and whether an ester or sulfonyl groupwasintroduced in the hydrocarbon chain. The substances containing a sulfonyl group showed the highest polymerization activity. The blue-to-red transition usually observed for diacetylenes in Langmuir and Langmuir-Blodgett films due to UV irradiation was not observed, instead the studied substances formed directly a red form polydiacetylene. A first-order consecutive reaction kinetic model with a steady-state approximation was successfully adapted to the experimental results of three of the studied compounds.