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Zouaoui Setifi1,2, Peter W R Corfield3, Fatima Setifi2

  • 1Département de Technologie, Faculté de Technologie, Université 20 Août 1955-Skikda, BP 26, Route d'El-Hadaiek, Skikda 21000, Algeria.

Acta Crystallographica. Section E, Crystallographic Communications
|September 19, 2018
PubMed
Summary
This summary is machine-generated.

The study details a novel iron(II) coordination compound featuring bis(pyridin-2-yl)methanamine ligands. This structure exhibits distorted octahedral geometry and includes a disordered polynitrile anion, influencing crystal packing through weak interactions.

Keywords:
crystal structureiron(II) complexpolynitrile anionterdentate ligands

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Area of Science:

  • Coordination Chemistry
  • Crystal Engineering
  • Supramolecular Chemistry

Background:

  • Iron(II) complexes are crucial in various chemical and biological systems.
  • Bis(pyridin-2-yl)methanamine (dipa) is a versatile chelating ligand.
  • Polynitrile anions offer unique electronic and structural properties.

Purpose of the Study:

  • To synthesize and characterize a new iron(II) coordination compound.
  • To investigate the structural implications of steric hindrance from dipa ligands.
  • To explore the role of the polynitrile anion in crystal packing.

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Spectroscopic characterization (implied).
  • Crystallographic symmetry analysis.

Main Results:

  • The iron(II) cation is coordinated by two dipa ligands, forming a distorted octa-hedral geometry.
  • The 1,1,3,3-tetra-cyano-2-(di-cyano-methylid-ene)propane-1,3-diide (tcpd2-) anion is disordered and non-coordinated.
  • Weak N-H⋯N interactions facilitate an alternating chain of cations and anions in the crystal.

Conclusions:

  • The steric bulk of dipa ligands dictates the coordination geometry around the Fe(II) center.
  • The tcpd2- anion's disorder and non-coordination influence the overall crystal structure.
  • Supramolecular assembly is driven by specific hydrogen bonding interactions between the complex and the anion.