Anion, solvent and time dependence of high-spin-low-spin interactions in a 3D coordination polymer

Jameson, Guy N.L., Werner, Franz, Bartel, Matthias, Absmeier, Alina, Reissner, Michael, Kitchen, Jonathan A., Brooker, Sally, Caneschi, Andrea, Carbonera, Chiara, Létard, Jean-François and Linert, Wolfgang (2009) Anion, solvent and time dependence of high-spin-low-spin interactions in a 3D coordination polymer. European Journal of Inorganic Chemistry, 2009 (26), 3948-3959. (doi:10.1002/ejic.200900537).

Abstract

A thorough investigation into the role of the counterion and occluded solvent on the structure and spin-crossover behaviour of the threefold interpenetrated network [Fe(4ditz)(3)](2+) [4ditz = 1,4-bis(tetrazol-1-yl) butane I is presented. As seen by X-ray single crystal diffraction, changing the hexafluorophosphate anion in the previously investigated trigonal phase [Fe(4ditz)(3)](PF6)(2) to tetrafluoroborate causes the butylene spacers to adopt three different conformations, whereupon the symmetry is reduced to triclinic (space group Pi). X-ray powder diffraction and NMR spectroscopy provide evidence for the incorporation of statistically distributed ethanol molecules in the cavities of the compound, whose amount depends on whether absolute ethanol or a binary system, ethanol/water (95:5, v/v), is used as solvent. The phase precipitated from EtOH/H2O features a metastable high-spin (HS) state when rapidly cooled, a sharp spin transition to a mixed HS/LS (1:1) state at around 90 K on slow cooling with an approximately 10 K hysteresis and LIESST appears, whereas the sample synthesised from absolute ethanol shows a more gradual spin transition at the same temperature without hysteresis.

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Contributors

Author: Jonathan A. Kitchen

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