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Patterson-function direct methods for structure determination of organic compounds from powder diffraction data. XVI.

Jordi Rius1

  • 1Institut de Ciència de Materials de Barcelona (CSIC), Campus de la UAB, 08193 Bellaterra, Catalonia 08193, Spain. jordi.rius@icmab.es

Acta Crystallographica. Section A, Foundations of Crystallography
|December 22, 2010
PubMed
Summary
This summary is machine-generated.

New Patterson-function direct methods (DM) directly analyze experimental intensities, proving effective for powder diffraction data. These methods enhance phase refinement by including overlapped reflections, improving molecular structure determination.

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Area of Science:

  • Crystallography
  • Materials Science
  • Structural Chemistry

Background:

  • Direct methods (DM) are crucial for solving crystal structures from diffraction data.
  • Traditional DM often rely on the modulus function, which can be challenging with powder diffraction data.
  • Handling overlapped reflections in powder data is a significant challenge for phase refinement.

Purpose of the Study:

  • To introduce and evaluate a novel direct methods approach, Patterson-function DM, for crystal structure determination.
  • To demonstrate the suitability of Patterson-function DM for analyzing powder diffraction data.
  • To improve phase refinement accuracy by incorporating overlapped reflections.

Main Methods:

  • Development of Patterson-function direct methods (DM) that directly utilize experimental intensities.
  • Optimization of the sum function S(P) using a Patterson-function tangent formula (TF) and an S-FFT algorithm.
  • Application to synchrotron powder diffraction data, including overlapped reflections, for phase refinement.

Main Results:

  • Patterson-function DM successfully determined molecular structures from powder diffraction data.
  • The method effectively refined phases by including overlapped reflections, improving data resolution.
  • Molecules were readily identified in Fourier maps derived from the refined phases.

Conclusions:

  • Patterson-function DM offers a robust alternative for crystal structure determination, especially for powder diffraction data.
  • The method's ability to handle overlapped reflections enhances accuracy and minimizes termination effects.
  • Patterson-function DM is applicable to both powder and single-crystal diffraction data.