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Crystals 2019, 9(1), 46;

Spatio-temporal Investigations of the Incomplete Spin Transition in a Single Crystal of [Fe(2-pytrz)2{Pt(CN)4}]·3H2O: Experiment and Theory

Groupe d’Etudes de la Matière Condensée, UMR 8635, CNRS-Université de Versailles, Université Paris Saclay, 45 Avenue des Etats Unis, 78035 Versailles, France
Univ Brest, CNRS, CEMCA, 6 Avenue Le Gorgeu, C.S. 93837 - 29238 Brest Cedex 3, France
Author to whom correspondence should be addressed.
Received: 13 December 2018 / Revised: 9 January 2019 / Accepted: 11 January 2019 / Published: 16 January 2019
(This article belongs to the Special Issue Synthesis and Applications of New Spin Crossover Compounds)
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Optical microscopy technique is used to investigate the thermal and the spatio-temporal properties of the spin-crossover single crystal [Fe(2-pytrz) 2 {Pt(CN) 4 }]·3H 2 O, which exhibits a first-order spin transition from a full high-spin (HS) state at high temperature to an intermediate, high-spin low-spin (HS-LS) state, below 153 K, where only one of the two crystallographic Fe(II) centers switches from the HS to HS-LS state. In comparison with crystals undergoing a complete spin transition, the present transformation involves smaller volume changes at the transition, which helps to preserving the crystal’s integrity. By analyzing the spatio-temporal properties of this spin transition, we evidenced a direct correlation between the orientation and shape of HS/HS-LS domain wall with the crystal’s shape. Thanks to the small volume change accompanying this spin transition, the analysis of the experimental data by an anisotropic reaction-diffusion model becomes very relevant and leads to an excellent agreement with the experimental observations. View Full-Text
Keywords: spin-crossover; optical microscopy; reaction diffusion spin-crossover; optical microscopy; reaction diffusion

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Fourati, H.; Bouchez, G.; Paez-Espejo, M.; Triki, S.; Boukheddaden, K. Spatio-temporal Investigations of the Incomplete Spin Transition in a Single Crystal of [Fe(2-pytrz)2{Pt(CN)4}]·3H2O: Experiment and Theory. Crystals 2019, 9, 46.

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