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Related Experiment Videos

Potassium carbamoyldicyanomethanide.

John A Schlueter1, Urs Geiser

  • 1Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA. jaschleuter@anl.gov

Acta Crystallographica. Section C, Crystal Structure Communications
|January 9, 2004
PubMed
Summary

The crystal structure of potassium carbamoyldicyanomethanide (Kcdm) was determined. This compound features a unique coordination of potassium ions, forming layered structures with potential applications in coordination polymers.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Materials Science

Background:

  • The carbamoyldicyanomethanide (cdm) anion is a versatile ligand for coordination chemistry.
  • Previous studies have explored metal complexes with the cdm anion, such as [M(cdm)(2)(H(2)O)(4)].2H(2)O (M = Ni, Mn, Co).

Purpose of the Study:

  • To describe the crystal structure of the potassium salt of carbamoyldicyanomethanide (Kcdm).
  • To analyze the coordination environment of potassium ions and the molecular geometry of the cdm anion.
  • To explore the potential of Kcdm in forming transition metal coordination polymers.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the crystal structure of Kcdm.
  • Analysis of bond lengths, bond angles, and coordination geometry.

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  • Identification of intermolecular interactions, including hydrogen bonding.

    • Main Results:

    • The crystal structure of Kcdm was elucidated, revealing the coordination of K+ ions to nitrile and carbonyl groups of the cdm anion.
    • Potassium ions adopt a distorted trigonal prismatic coordination, forming mixed anion-cation sheets parallel to the ab plane.
    • Hydrogen bonding interactions link these sheets, contributing to the overall crystal packing.

    Conclusions:

    • Kcdm serves as a model compound for understanding the molecular geometry of the cdm anion.
    • The structural features of Kcdm suggest its utility in constructing transition metal coordination polymers.
    • The bidentate nature of the cdm anion may facilitate magnetic superexchange interactions in such polymers.