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Structural Insights into the Two-Step Spin-Crossover Compound Fe(3,4-dimethyl-pyridine)2[Ag(CN)2]2

1
Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156-38042 Grenoble, France
2
Department of Chemistry, Faculty of Science, Toho University, Miyama, Funabashi, Chiba 274-8510, Japan
3
Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC—Universidad de Zaragoza, 50009 Zaragoza, Spain
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(6), 316; https://doi.org/10.3390/cryst9060316
Received: 24 May 2019 / Revised: 6 June 2019 / Accepted: 16 June 2019 / Published: 19 June 2019
(This article belongs to the Special Issue Synthesis and Applications of New Spin Crossover Compounds)
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Abstract

The crystal structure of the polymeric spin crossover compound Fe(3,4-dimethyl-pyridine)2[Ag(CN)2]2 has been solved and its temperature dependence followed by means of single-crystal and powder X-ray diffraction. This compound presents a two-step spin transition with relatively abrupt steps centred at ca. 170 K and 145 K and a plateau at around 155 K. The origin of the two-step transition is discussed in light of these structural studies. The observations are compatible with a mostly disordered state between the two steps, consisting of mixing of high-spin and low-spin species, while weak substructure reflections in the mixed phase could indicate some degree of long-range order of the high-spin and low-spin sites. View Full-Text
Keywords: iron (II), spin crossover; X-ray diffraction; coordination polymers iron (II), spin crossover; X-ray diffraction; coordination polymers
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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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Rodríguez-Velamazán, J.A.; Kitase, K.; Palacios, E.; Castro, M.; Fernández-Blanco, Á.; Burriel, R.; Kitazawa, T. Structural Insights into the Two-Step Spin-Crossover Compound Fe(3,4-dimethyl-pyridine)2[Ag(CN)2]2. Crystals 2019, 9, 316.

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