Cr(pyrazine)2(OSO2CH3)2: A two-dimensional coordination polymer with an antiferromagnetic ground state

Panagiota Perlepe, Itziar Oyarzabal, Kasper S. Pedersen, Philippe Negrier, Denise Mondieig, Mathieu Rouzières, Elizabeth A. Hillard, Fabrice Wilhelm, Andrei Rogalev, Elizaveta A. Suturina, Corine Mathonière, Rodolphe Clérac

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Abstract

A novel two-dimensional (2D) coordination polymer with the formula Cr(pyrazine)2(OSO2CH3)2 has been synthesized and characterized. Powder X-ray diffraction data reveal that this material, which crystalizes in the Pnnm orthorhombic space group, is composed of rectangular grid layers with octahedral CrN4O2 nodes bridged by pyrazine ligands. Since the redox-active pyrazine can be reduced in the presence of transition metals, X-ray absorption spectroscopy and quantum chemical calculations were used to confirm the +II oxidation state of the Cr center. Magnetic susceptibility measurements indicate the presence of antiferromagnetic interactions between the chromium(II) centers through the neutral pyrazine and suggest an antiferromagnetic ordered state below TN ≈ 10 K, which was confirmed by heat-capacity measurements.

Original languageEnglish
Pages (from-to)248-253
Number of pages6
JournalPolyhedron
Volume153
Early online date18 Jul 2018
DOIs
Publication statusPublished - 1 Oct 2018

Keywords

  • Chromium
  • Coordination chemistry
  • Magnetic properties
  • Pyrazine
  • X-ray spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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    Perlepe, P., Oyarzabal, I., Pedersen, K. S., Negrier, P., Mondieig, D., Rouzières, M., Hillard, E. A., Wilhelm, F., Rogalev, A., Suturina, E. A., Mathonière, C., & Clérac, R. (2018). Cr(pyrazine)2(OSO2CH3)2: A two-dimensional coordination polymer with an antiferromagnetic ground state. Polyhedron, 153, 248-253. https://doi.org/10.1016/j.poly.2018.07.011