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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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Occupancy Determination from Resonant X-ray Diffraction.

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Anomalous X-ray diffraction on mixed-metal clusters reveals that data quality and structural models significantly impact results. In-house X-ray diffraction proved as accurate as synchrotron sources for composition determination.

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Area of Science:

  • Materials Science
  • Crystallography
  • Chemistry

Background:

  • Anomalous X-ray diffraction (AXD) is a powerful technique for probing the elemental composition and structure of materials.
  • Mixed-metal molecular clusters present unique challenges for structural analysis due to potential substitutional disorder.
  • Understanding the factors influencing AXD data accuracy is crucial for reliable structural determination.

Purpose of the Study:

  • To investigate the impact of experimental parameters on the accuracy of AXD data for mixed-metal molecular clusters.
  • To compare the effectiveness of different methods for determining metal site occupancies and compositions.
  • To evaluate the precision of in-house X-ray diffraction versus synchrotron sources for composition analysis.

Main Methods:

  • Anomalous X-ray diffraction experiments on three mixed-metal molecular clusters at Ni and Zn K-edges.
  • Structural refinement and data scaling analyses.
  • Comparison of occupancy studies using different X-ray sources (synchrotron and in-house Cu Kα) and refinement strategies.

Main Results:

  • Data resolution and structural model accuracy significantly affect resonant scattering factors (f', f″) and their uncertainties.
  • Highly ordered structural compositions were observed, contrary to expectations of statistical mixing.
  • In-house X-ray diffraction provided composition determination precision comparable to synchrotron sources for these mixed-metal clusters.

Conclusions:

  • Experimental parameters and structural model accuracy are critical for reliable AXD analysis of mixed-metal clusters.
  • In-house X-ray diffraction is a viable and precise alternative to synchrotron radiation for determining the composition of such systems.
  • The studied mixed-metal clusters exhibit well-defined, ordered structures.