Journal of the Iranian Chemical Society

, Volume 10, Issue 4, pp 659–667

Computational prediction of temperature dependence of 13C NMR lineshapes of planar molecules in structure I clathrate hydrates

  • Hossein Mohammadi-Manesh
  • Saman Alavi
  • Tom K. Woo
  • Bijan Najafi
Original Paper

DOI: 10.1007/s13738-012-0198-9

Cite this article as:
Mohammadi-Manesh, H., Alavi, S., Woo, T.K. et al. J IRAN CHEM SOC (2013) 10: 659. doi:10.1007/s13738-012-0198-9
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Abstract

We use the molecular dynamics-based method to predict the solid-state 13C NMR lineshape of a planar molecule in a nonspherical cage. Unlike linear molecules, three components of the chemical shielding tensor of a planar molecule are different which gives rise to a different lineshape and temperature dependence in the 13C NMR spectrum. We study the planar ethylene molecule in the oblate large cages of the structure I (sI) clathrate hydrate and extract the lineshapes from the angular distribution and dynamics at four temperatures (70, 150, 200, and 250 K) in the stability range of the hydrate. At low temperature, the C2H4 molecules have limited range of motion in the cages, but as the temperature is raised, they first gain greater rotational freedom about the molecular C=C axis, and then in other directions. These data allow for the calculation of the 13C NMR lineshapes of the C2H4 guests at each temperature.

Graphical abstract

Keywords

Clathrate hydrates NMR lineshapes Host–guest systems Molecular dynamics simulations Inclusion compounds Planar molecules 

Supplementary material

13738_2012_198_MOESM1_ESM.doc (1.2 mb)
Supplementary material 1 (DOC 1253 kb)

Copyright information

© Iranian Chemical Society 2012

Authors and Affiliations

  • Hossein Mohammadi-Manesh
    • 1
  • Saman Alavi
    • 2
  • Tom K. Woo
    • 2
  • Bijan Najafi
    • 3
  1. 1.Department of ChemistryYazd UniversityYazdIran
  2. 2.Department of Chemistry, Center for Catalysis Research and InnovationUniversity of OttawaOttawaCanada
  3. 3.Department of ChemistryIsfahan University of TechnologyIsfahanIran

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