On Three-dimensional Electron Diffraction Data Quality for Probing Molecular Motions

Abstract

Molecular motions in metal-organic frameworks (MOFs) play important roles in guest diffusion processes, which is crucial for gas capture and separations. Three-dimensional electron diffraction (3DED) has emerged as an advanced method to probe molecular motions, such as linker librations. For a study of molecular motions by 3DED, data quality is the key to the analysis and interpretation. Herein, we present a systematic work to investigate the effects of data completeness, resolution, and signal-to-noise ratio on the identification of molecular motion in MIL-140C. We determine the limits of completeness and resolution required for reliably analyzing molecular motions. In addition, data processing can affect the signal-to-noise ratio of data, and we demonstrate their influence on probing molecular motions. This work provides reference conditions on 3DED data quality to obtain reliable information on molecular motions.

Keywords

Metal-organic framework / Molecular motion / Three-dimensional electron diffraction / Data quality / Thermal ellipsoid model

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Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH