Partially Reversible Thermal-Induced Oxidation During a Dehydration Process in an H-bonded Supramolecular System

Sylvie Ferlay; Petra Hellwig; Mir Wais Hosseini

doi:10.1002/cphc.201800845

Partially Reversible Thermal-Induced Oxidation During a Dehydration Process in an H-bonded Supramolecular System

Chemphyschem. 2018 Oct 11. doi: 10.1002/cphc.201800845. Online ahead of print.

Authors

Sylvie Ferlay¹, Petra Hellwig², Mir Wais Hosseini¹

Affiliations

¹ Molecular Tectonics Laboratory, University of Strasbourg, UMR UDS-CNRS 7140, Institut le Bel, 4, rue Blaise Pascal, F-67000, Strasbourg, France.
² Laboratoire de Bioélectrochimie et Spectroscopie, University of Strasbourg, UMR UDS-CNRS 7140, Institut le Bel, 4, rue Blaise Pascal, F-67000, Strasbourg, France.

PMID: 30307706
DOI: 10.1002/cphc.201800845

Abstract

The thermal behaviour of an H-bonded molecular network A based on [Fe^II (CN)₆ ]^4- anions and organic bisamidium cations 1²⁺ was investigated. Heating was found to induce the partial oxidation of [Fe^II (CN)₆ ]^4- into [Fe^III (CN)₆ ]^3- , together with a thermochromic effect and also a loss of crystallinity was evidenced from mid and far FT-IR spectroscopic data, XRPD and DSC/TGA analysis. Rehydration also partially reversed the redox reaction and its colour, and after that, a mixture of A with an amorphous phases was observed. FT-IR spectroscopy revealed that the oxidation of Fe(II) was accompanied by a deprotonation of the cation.

Keywords: IR spectroscopy; X-ray diffraction; hexacyanoferrate; hydrogen bonds; thermal oxidation.

Abstract

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