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Spin Transition Kinetics in the Salt [H2N(CH3)2]6[Fe3(L)6(H2O)6] (L = 4-(1,2,4-triazol-4-yl)ethanedisulfonate)

Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Avinguda Països Catalans 16, Tarragona E-43007, Spain
Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys 23, Barcelona E-08010, Spain
Author to whom correspondence should be addressed.
Academic Editors: Guillem Aromí, José Antonio Real and Carlos J. Gómez García
Magnetochemistry 2016, 2(2), 20;
Received: 15 January 2016 / Revised: 29 February 2016 / Accepted: 7 March 2016 / Published: 28 March 2016
(This article belongs to the Special Issue Spin Crossover (SCO) Research)
The dimethylammonium salt of the FeII polyanionic trimer [Fe3(μ-L)6(H2O)6]6− (L = 4-(1,2,4-triazol-4-yl)ethanedisulfonate) exhibits a thermally induced spin transition above room temperature with one of the widest hysteresis cycles observed in a spin crossover compound (>85 K). Furthermore, the metastable high-spin (HS) state can be thermally trapped via relatively slow cooling, remaining metastable near room temperature, with a characteristic TTIESST = 250 K (TIESST = temperature-induced excited spin-state trapping). The origin for this unique behavior is still uncertain. In this manuscript, we report detailed studies on the relaxation kinetics of this system in order to disclose the mechanism and cooperativity controlling this process. View Full-Text
Keywords: spin crossover; hysteresis; relaxation kinetics; iron; triazole spin crossover; hysteresis; relaxation kinetics; iron; triazole
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Sáenz de Pipaón, C.; Maldonado-Illescas, P.; Gómez, V.; Galán-Mascarós, J.R. Spin Transition Kinetics in the Salt [H2N(CH3)2]6[Fe3(L)6(H2O)6] (L = 4-(1,2,4-triazol-4-yl)ethanedisulfonate). Magnetochemistry 2016, 2, 20.

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