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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Solid state NMR and computational studies on cyclopentadienyl lithium.

Haijun Jiao1, Walter Bauer2

  • 1Leibniz Institute for Catalysis (LIKAT Rostock), Albert-Einstein-Str. 29 a, 18059, Rostock, Germany.

Journal of Molecular Modeling
|June 21, 2019
PubMed
Summary

Solid-state nuclear magnetic resonance (NMR) revealed detailed structural information about lithium cyclopentadienide, a polymeric compound. This study provides a new method for analyzing air-sensitive materials using NMR spectroscopy.

Keywords:
13C6Li Moment analysisAir sensitiveB3LYP GIAOCyclopentadienylHerzfeld BergerLithiumSample preparationShift tensorSolid state NMR

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Computational chemistry

Background:

  • Lithium cyclopentadienide is known as a polymeric material in its solid state.
  • Understanding the structure of such compounds is crucial for materials science applications.

Purpose of the Study:

  • To investigate the solid-state structure of lithium cyclopentadienide.
  • To characterize the shielding tensor components using NMR spectroscopy and theoretical calculations.
  • To develop a simple method for preparing air-sensitive compounds for solid-state NMR analysis.

Main Methods:

  • Solid-state 13C- and 6Li-Cross-Polarization Magic Angle Spinning (CP/MAS) NMR spectroscopy.
  • B3LYP-GIAO theoretical calculations for spectral simulation and tensor component analysis.
  • Development of a novel sample preparation technique for air-sensitive compounds.

Main Results:

  • Identified axially symmetric 13C-shift tensor components: δ11 = δ22 = 151.5 ppm, δ33 = 15.5 ppm.
  • Determined 6Li-tensor components: δ11 = δ22 = +1.0 ppm, δ33 = -43.0 ppm, attributed to ring current effects.
  • Demonstrated excellent agreement between experimental NMR data and theoretical calculations.

Conclusions:

  • The study provides precise structural insights into polymeric lithium cyclopentadienide.
  • The developed NMR method facilitates the analysis of challenging air-sensitive organometallic compounds.
  • Computational chemistry significantly aids in interpreting complex solid-state NMR spectra.