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Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases
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Control of crystal structure using temperature and time.

Savannah C Zacharias1, Gaëlle Ramon1, Susan A Bourne1

  • 1Centre for Supramolecular Chemistry Research, Department of Chemistry, University of Cape Town, Rondebosch, Cape Town, 7701, South Africa.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|August 25, 2018
PubMed
Summary
This summary is machine-generated.

Reaction conditions like temperature and time control the crystal structures formed from iron(III) acetylacetonate and 2,6-pyridinedicarboxylic acid. Different structures, including discrete complexes and tetramers, were observed.

Keywords:
X-ray diffractioncrystal engineeringhydrogen bondingstructural diversity

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Coordination Chemistry

Background:

  • Iron complexes with dicarboxylic acids are of interest due to their diverse applications.
  • Understanding the factors influencing crystal structure formation is crucial for designing new materials.

Purpose of the Study:

  • To investigate the synthesis and structural characterization of novel iron(III) complexes.
  • To determine the effect of reaction temperature and time on the resulting crystal structures.

Main Methods:

  • Reaction of iron(III) acetylacetonate with 2,6-pyridinedicarboxylic acid in acetonitrile.
  • Crystallization under varying temperature and time conditions.
  • X-ray diffraction analysis for crystal structure elucidation.

Main Results:

  • Three distinct crystal structures were obtained, dependent on reaction parameters.
  • At room temperature, a discrete complex [FeC12H12NO7]·CH3CN (I) was formed.
  • At 60°C, a discrete complex FeC12H10NO6 (II) formed after 2 hours, and a tetrameric complex [FeC12H10NO6]4 (III) formed after 24 hours.

Conclusions:

  • The crystal structure of iron(III) complexes with 2,6-pyridinedicarboxylic acid is sensitive to reaction temperature and duration.
  • The study demonstrates control over the formation of discrete versus tetrameric iron complexes.