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Di-aqua-dichlorido-bis-(pyridine-κN)cobalt(II).

P S Kannan1, A S Ganeshraja2, K Anbalagan2

  • 1Department of Physics, S. R. R. Engineering College (A. Jeppiaar Institution), Old Mamallapuram Road, Padur, Chennai 603 103, India.

Acta Crystallographica. Section E, Structure Reports Online
|January 16, 2014
PubMed
Summary

This study characterizes a cobalt(II) complex, [CoCl2(C5H5N)2(H2O)2], revealing its distorted octahedral geometry and nonmerohedral twinning. Crystal packing is stabilized by hydrogen bonds and pi-pi interactions between pyridine rings.

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Area of Science:

  • Coordination Chemistry
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Cobalt(II) complexes with pyridine and chloride ligands are of interest for their diverse structural and magnetic properties.
  • Understanding the coordination environment and crystal packing is crucial for predicting material behavior.

Purpose of the Study:

  • To elucidate the crystal structure and coordination geometry of the title cobalt(II) complex, [CoCl2(C5H5N)2(H2O)2].
  • To investigate the presence and nature of intermolecular interactions, such as hydrogen bonding and pi-pi stacking, within the crystal lattice.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
  • Refinement of nonmerohedral twinning was performed to accurately model the crystal domains.

Main Results:

  • The cobalt(II) ion is located on an inversion center, exhibiting a distorted octahedral coordination with two N, two Cl, and two water ligands.
  • The crystal structure displays nonmerohedral twinning with refined volume fractions of 0.883(2) and 0.117(3).
  • Two-dimensional networks are formed via O-H⋯Cl hydrogen bonds, and pi-pi interactions between pyridine rings are observed with specific centroid-centroid distances.

Conclusions:

  • The [CoCl2(C5H5N)2(H2O)2] complex possesses a unique distorted octahedral geometry and exhibits nonmerohedral twinning.
  • Hydrogen bonding and pi-pi interactions play significant roles in stabilizing the crystal packing, contributing to the formation of extended networks.