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Phosphorescence and phase structure of benzophenone—organomontmorillonite nanocomposites

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Abstract

We have investigated the temperature dependences (in the 4.2–180 K range) of the phosphorescence spectra of benzophenone (BP) in the presence of nanodisperse particles of the clay mineral montmorillonite (MMT) modified by different surface-active substances: dioctadecyldimethylammonium (DODM) and octadecylbenzyldimethylammonium (OBDM) chlorides. The MMT-OBDM sample has a stronger affinity for the given organic medium (BP) in the composite compared to the MMT-DODM sample due to the presence of a benzyl radical in the composition of the first modifier molecule. It has been shown that in the investigated heterosystems BP is present in both the crystal phase and the amorphous phase, and the latter thereby is formed in the near-surface layers of nanoparticles in the form of a thin shell due to the disordering action of inorganic particles on their adjacent BP layers. An increase in the chemical affinity between the organic clay surface and the BP molecules promotes the relaxation processes in the amorphous films of BP and increases the decay rate of its phosphorescence.

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Authors and Affiliations

  1. Institute of Physics, National Academy of Sciences of Ukraine, 46 Nauka Ave., Kiev, 03022, Ukraine

    T. A. Gavrilko, V. I. Mel’nik, I. T. Chashechnikova & E. A. Shaidyuk

  2. Institute of Biocolloidal Chemistry, National Academy of Sciences of Ukraine, Kiev

    V. N. Moraru

  3. Institut für Physikalische Chemie, Martin-Luther-Universität, Halle-Wittenberg, Germany

    A. Hauser

Authors
  1. T. A. Gavrilko
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  2. V. I. Mel’nik
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  3. V. N. Moraru
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  4. I. T. Chashechnikova
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  5. E. A. Shaidyuk
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  6. A. Hauser
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 809–814, November–December, 2005.

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Gavrilko, T.A., Mel’nik, V.I., Moraru, V.N. et al. Phosphorescence and phase structure of benzophenone—organomontmorillonite nanocomposites. J Appl Spectrosc 72, 887–892 (2005). https://doi.org/10.1007/s10812-006-0021-4

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  • DOI: https://doi.org/10.1007/s10812-006-0021-4

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