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 language | English |
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Pages (from-to) | 248-253 |
Number of pages | 6 |
Journal | Polyhedron |
Volume | 153 |
Early online date | 18 Jul 2018 |
DOIs | |
Publication status | Published - 1 Oct 2018 |
Funding
This work was supported by the University of Bordeaux, the Région Nouvelle Aquitaine, the Centre National de la Recherche Scientifique (CNRS) and the Marie Skłodowska-Curie grant 745696 ETSMM (Postdoctoral fellowship for I.O.). The authors thank the GdR MCM-2 (Magnétisme et Commutation Moléculaires) and the MOLSPIN COST action CA15128. E.A.S. acknowledges financial support from the Russian Science Foundation (Project 16-13-10155 ), EPSRC ( EP/N006895/1 ), the Supercomputer Center of Novosibirsk State University and the IRIDIS High Performance Computing Facility. X. Ma, A. Hen, M. Platunov, E. Lebraud and S. Exiga are thanked for helpful discussions and experimental assistance. Appendix A
Keywords
- Chromium
- Coordination chemistry
- Magnetic properties
- Pyrazine
- X-ray spectroscopy
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry