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X-ray photoelectron study of the MoCl2C30H30 composite

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Abstract

The surface of a MoCl2C30H30 composite in the form of molybdenum nanoclusters in a polyacetylene matrix, produced by reacting MoCl5 with C2H2 in benzene and toluene, has been studied by X-ray photoelectron spectroscopy before and after Ar+ ion milling. The composite actively reacts with atmospheric oxygen and moisture. As a result, the molybdenum clusters on its surface oxidize to molybdenum(V) or molybdenum(VI) oxides or oxychlorides (E b(Mo 3d 5/2) = 232.3–232.5 eV) during the sample preparation process. The electron binding energy of molybdenum affter surface etching (E b(Mo 3d 5/2) = 228.5 eV) suggests that the oxidation state of the molybdenum in the composite is 2+ or 3+. Analysis of the structure of the spectrum of the C 2s electrons of the inner valence molecular orbitals using the energy level diagram of the C2 molecule suggests that the hydrocarbon matrix of the composite contains, in addition to-CH=CH-CH=CH- conjugate bonds, linear carbyne fragments: -HC=C=CH- or -C≡C-. After etching, the surface layer of the composite contained argon, which might be due to adsorption because of the small particle size of the composite or chemisorption on the surface of the polyacetylene matrix. The composite is stable in a high vacuum of 1.3 × 10−5 Pa up to 350°C and does not experience charging when exposed to X-rays, which indicates that it has weak dielectric properties.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia

    E. G. Il’in & A. S. Parshakov

  2. Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia

    A. Yu. Teterin, K. I. Maslakov & Yu. A. Teterin

Authors
  1. E. G. Il’in
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  2. A. S. Parshakov
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  3. A. Yu. Teterin
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  4. K. I. Maslakov
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  5. Yu. A. Teterin
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Original Russian Text © E.G. Il’in, A.S. Parshakov, A.Yu. Teterin, K.I. Maslakov, Yu.A. Teterin, 2011, published in Neorganicheskie Materialy, 2011, Vol. 47, No. 4, pp. 499–505.

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Il’in, E.G., Parshakov, A.S., Teterin, A.Y. et al. X-ray photoelectron study of the MoCl2C30H30 composite. Inorg Mater 47, 442–448 (2011). https://doi.org/10.1134/S0020168511040145

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  • DOI: https://doi.org/10.1134/S0020168511040145

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