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Molecular Structure of PrBr3 and HoBr3 According to Simultaneous Electron Diffraction and Mass Spectrometry Experiment

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Abstract

The saturated vapors of praseodymium and holmium tribromides were investigated for the first time by electron diffraction with mass spectral monitoring at 1100(10) and 991(10) K. It is established that the molecules have a pyramidal effective configuration with bond angles Br–Pr–Br = 114.7(10)° and Br–Ho–Br = 115.3(11)°. Given the low deformation vibration frequencies of lanthanide tribromide molecules, the insignificant pyramidality of the rg configuration may correspond to the planar equilibrium geometry of D3h symmetry for the molecules. The internuclear distances rg(Pr–Br) = 2.696(6) Å and rg(Ho–Br) = 2.594(5) Å point to the lanthanide compression effect. The vibration frequencies of PrBr3 and HoBr3 molecules were estimated from electron diffraction data.

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Authors and Affiliations

  1. Ivanovo State University, U.S.A

    N. I. Giricheva, G. V. Girichev, S. A. Shlykov, A. V. Krasnov, A. V. Zakharov & O. G. Krasnova

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  1. N. I. Giricheva
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  2. G. V. Girichev
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  3. S. A. Shlykov
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  4. A. V. Krasnov
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  5. A. V. Zakharov
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  6. O. G. Krasnova
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Giricheva, N.I., Girichev, G.V., Shlykov, S.A. et al. Molecular Structure of PrBr3 and HoBr3 According to Simultaneous Electron Diffraction and Mass Spectrometry Experiment. Journal of Structural Chemistry 45, 47–55 (2004). https://doi.org/10.1023/B:JORY.0000041500.83936.9c

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  • DOI: https://doi.org/10.1023/B:JORY.0000041500.83936.9c

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