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Direct Location of Organic Molecules in Framework Materials by Three-Dimensional Electron Diffraction.

Meng Ge1, Taimin Yang1, Hongyi Xu1

  • 1Department of Materials and Environmental Chemistry, Stockholm University, Stockholm SE-106 91, Sweden.

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|August 11, 2022
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Summary

Three-dimensional electron diffraction (3D ED) now enables ab initio structure determination of guest molecules within nanocrystal frameworks. This powerful technique reveals host-guest interactions with high accuracy, even at room temperature.

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Probing host-guest interactions in framework materials is crucial for applications like gas sorption and catalysis.
  • Single-crystal X-ray diffraction (SCXRD) is limited by the need for large crystals, which can be damaged by guest molecules.
  • Nanocrystal analysis presents challenges for conventional structural determination methods.

Purpose of the Study:

  • To demonstrate the capability of three-dimensional electron diffraction (3D ED) for ab initio structure solution of guest molecules within framework materials.
  • To analyze host-guest interactions in SU-8 and SU-68 framework materials using 3D ED.
  • To establish 3D ED as a reliable tool for studying host-guest systems, particularly in nanocrystals.

Main Methods:

  • Application of three-dimensional electron diffraction (3D ED) on SU-8 and SU-68 nanocrystals.
  • Fast data collection with ultralow electron dose (0.8-2.6 e⁻ Å⁻²).
  • Ab initio structure solution and analysis of difference electrostatic potential maps.

Main Results:

  • Successfully located nonhydrogen atoms of organic guest molecules within framework materials using 3D ED.
  • Identified two distinct spatial configurations for a guest molecule within the SU-8 framework.
  • Observed strong hydrogen bonding interactions between guest molecules and the framework, leading to well-defined positions.
  • Demonstrated the feasibility of studying host-guest systems at room temperature.

Conclusions:

  • Three-dimensional electron diffraction (3D ED) is a powerful and reliable tool for ab initio structure determination of guest molecules in nanocrystal frameworks.
  • 3D ED overcomes limitations of SCXRD, enabling detailed analysis of host-guest interactions at the nanoscale.
  • The method provides high accuracy and reliability for understanding molecular arrangements and interactions in complex materials.