Iron(II) Spin Crossover Complexes with 4,4'-Dipyridylethyne-Crystal Structures and Spin Crossover with Hysteresis

Katja Dankhoff; Charles Lochenie; Birgit Weber

doi:10.3390/molecules25030581

Iron(II) Spin Crossover Complexes with 4,4'-Dipyridylethyne-Crystal Structures and Spin Crossover with Hysteresis

Molecules. 2020 Jan 29;25(3):581. doi: 10.3390/molecules25030581.

Authors

Katja Dankhoff¹, Charles Lochenie¹, Birgit Weber¹

Affiliation

¹ Department of Chemistry, Inorganic Chemistry IV, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany.

Abstract

Three new iron(II) 1D coordination polymers with cooperative spin crossover behavior showing thermal hysteresis loops were synthesized using N₂O₂ Schiff base-like equatorial ligands and 4,4'-dipyridylethyne as a bridging, rigid axial linker. One of those iron(II) 1D coordination polymers showed a 73 K wide hysteresis below room temperature, which, upon solvent loss, decreased to a still remarkable 30 K wide hysteresis. Single crystal X-ray structures of two iron(II) coordination polymers and T-dependent powder XRD patterns are discussed to obtain insight into the structure property relationship of those materials.

Keywords: Schiff base ligand; cooperative interactions; hysteresis; iron; spin crossover.

MeSH terms

Calorimetry, Differential Scanning
Crystallography, X-Ray
Electrochemistry
Iron / chemistry*
Iron Compounds / chemical synthesis*
Magnetics
Models, Molecular
X-Ray Diffraction

Substances

Iron Compounds
Iron