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Crystals 2016, 6(4), 38; doi:10.3390/cryst6040038

Synthesis, Structures and Properties of Cobalt Thiocyanate Coordination Compounds with 4-(hydroxymethyl)pyridine as Co-ligand

1
Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Str. 2, Kiel 24118, Germany
2
Max Planck Institut für Festkörperforschung, Heisenbergstr. 1, Stuttgart 70569, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Thomas Doert and Mathias Wickleder
Received: 29 February 2016 / Revised: 22 March 2016 / Accepted: 24 March 2016 / Published: 2 April 2016
(This article belongs to the Special Issue Crystal Structure of Complex Compounds)
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Abstract

Reaction of Co(NCS)2 with 4-(hydroxymethyl)pyridine (hmpy) leads to the formation of six new coordination compounds with the composition [Co(NCS)2(hmpy))4] (1), [Co(NCS)2(hmpy)4] × H2O (1-H2O), [Co(NCS)2(hmpy)2(EtOH)2] (2), [Co(NCS)2(hmpy)2(H2O)2] (3), [Co(NCS)2(hmpy)2]n∙4 H2O (4) and [Co(NCS)2(hmpy)2]n (5). They were characterized by single crystal and powder X-ray diffraction experiments, thermal and elemental analysis, IR and magnetic measurements. Compound 1 and 1-H2O form discrete complexes, in which the Co(II) cations are octahedrally coordinated by two terminal thiocyanato anions and four 4-(hydroxymethyl)pyridine ligands. Discrete complexes were also observed for compounds 2 and 3 where two of the hmpy ligands were substituted by solvent, either water (3) or ethanol (2). In contrast, in compounds 4 and 5, the Co(II) cations are linked into chains by bridging 4-(hydroxymethyl)pyridine ligands. The phase purity was checked with X-ray powder diffraction. Thermogravimetric measurements showed that compound 3 transforms into 5 upon heating, whereas the back transformation occurs upon resolvation. Magnetic measurements did not show any magnetic exchange via the hmpy ligand for compound 5. View Full-Text
Keywords: coordination compounds; thiocyanate; crystal structures; thermal properties; magnetic properties; Rietveld refinement coordination compounds; thiocyanate; crystal structures; thermal properties; magnetic properties; Rietveld refinement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Suckert, S.; Germann, L.S.; Dinnebier, R.E.; Werner, J.; Näther, C. Synthesis, Structures and Properties of Cobalt Thiocyanate Coordination Compounds with 4-(hydroxymethyl)pyridine as Co-ligand. Crystals 2016, 6, 38.

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