Parallel Crystallization of a "Static" and a Spin-Crossover Polymorph of an Iron(II) Complex from the Same Solution

Haryono M, Heinemann FW, Petukhov K, Gieb K, Müller P, Grohmann A (2009)

Publication Status: Published

Publication Type: Journal article

Publication year: 2009

Journal

European Journal of Inorganic Chemistry Wiley-VCH Verlag

Publisher: WILEY-V C H VERLAG GMBH

Pages Range: 2136-2143

Journal Issue: 14

DOI: 10.1002/ejic.200900130

Abstract

The ligand 2,6-bis(1H-pyrazol-1-yl)-4-(thiocyanatomethyl)pyridine (L) has been prepared from the hydroxymethyl precursor by OH/Br exchange and subsequent thiocyanate substitution. Two polymorphs of the unsolvated iron(II) complex [Fe(L)(2)](BF(4))(2) crystallize at room temperature from the same solution (MeOH), and side by side. One (yellow) is high spin between 4 and 350 K, whereas the other (red-brown) shows spin crossover, with a thermal spin-transition centred at 272 K (width ca. 50 K). Both forms have been fully characterized by variable-temperature structure determination and magnetic susceptibility measurements. At a given temperature, the solid-state structures differ strongly with respect to the coordination geometry at iron(II), the orientation of the thiocyanatomethyl substituents, and cation-anion contacts. The implications of these structural differences for the observed spin behaviour are discussed. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

Authors with CRIS profile

Frank Wilhelm Heinemann Lehrstuhl für Anorganische und Allgemeine Chemie Klaus Gieb Lehrstuhl für Experimentalphysik Paul Müller Lehrstuhl für Experimentalphysik

Involved external institutions

Technische Universität Berlin

Germany (DE)

How to cite

APA:

Haryono, M., Heinemann, F.W., Petukhov, K., Gieb, K., Müller, P., & Grohmann, A. (2009). Parallel Crystallization of a "Static" and a Spin-Crossover Polymorph of an Iron(II) Complex from the Same Solution. European Journal of Inorganic Chemistry, 14, 2136-2143. https://doi.org/10.1002/ejic.200900130

MLA:

Haryono, Marco, et al. "Parallel Crystallization of a "Static" and a Spin-Crossover Polymorph of an Iron(II) Complex from the Same Solution." European Journal of Inorganic Chemistry 14 (2009): 2136-2143.

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