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Related Experiment Videos

Hexaaquairon(II) dipicrate dihydrate.

Kazumasa Honda1, Hiroshi Yamawaki, Makoto Matsukawa

  • 1National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. kaz-honda@aist.go.jp

Acta Crystallographica. Section C, Crystal Structure Communications
|August 12, 2003
PubMed
Summary

The crystal structure of iron(III) hexaaqua complex with picrate shows separate stacks of cations and anions. Variable-temperature X-ray diffraction indicates no phase transitions between 93 K and room temperature.

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Area of Science:

  • Crystal Engineering
  • Coordination Chemistry
  • Solid-State Chemistry

Background:

  • Understanding the supramolecular assembly of metal complexes and organic anions is crucial for designing novel materials.
  • Picrate, a known energetic anion, can participate in various intermolecular interactions.
  • Iron(III) complexes offer diverse coordination environments and redox properties.

Purpose of the Study:

  • To elucidate the crystal structure of the iron(III) hexaaqua picrate complex.
  • To investigate the intermolecular interactions and packing in the solid state.
  • To determine the thermal behavior and identify any phase transitions.

Main Methods:

  • Single-crystal X-ray diffraction at variable temperatures (93 K to room temperature).

Related Experiment Videos

  • Analysis of crystallographic data to determine atomic positions, bond lengths, and intermolecular contacts.
  • Lattice parameter measurements as a function of temperature.

    • Main Results:

    • The crystal structure features separate, non-coordinating stacks of [Fe(H2O)6]3+ cations and picrate anions along the b axis.
    • Short intermolecular C-C contacts (3.083(4) and 3.055(4) Å) were observed within the picrate stacks.
    • Lattice parameters decreased linearly with decreasing temperature, with no evidence of a phase transition.

    Conclusions:

    • The iron(III) hexaaqua picrate complex forms a layered structure with distinct cationic and anionic columns.
    • The absence of metal-ligand bonding between iron and picrate simplifies the coordination environment.
    • The observed linear thermal contraction suggests structural stability over the studied temperature range.