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Issue 34, 2018
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Tuning the spin crossover behavior of the polyanion [(H2O)6Fe3(μ-L)6]6–: the case of the cesium salt

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Abstract

The magnetic behavior of the polyanion [Fe3(μ-L)6(H2O)6]6– (L2– = (1,2,4-triazol-4-yl)ethanedisulfonate) as the corresponding dimethylammonium salt shows memory effect above room temperature, with a dynamic thermal hysteresis cycle over 90 K and temperature-induced excited spin state trapping (TIESST) phenomena at the highest temperatures reported. Taking advantage of the polyanionic nature of this trimetallic complex, we were able to substitute the dimethylammonium cations by the monovalent heavy alkali metal cesium. This methathesis yielded the salt Cs6[Fe3(μ-L)6(H2O)6], with different molecular packing that increases the number and strength of cation–anion interactions, including a more robust H-bonded network. In this phase, the spin transition still occurs above room temperature, but it is more abrupt and narrow (≈50 K wide hysteresis). Despite these differences, TIESST is observed with almost identical characteristic temperature (TTIESST = 240 K) than in the parent compound, which is an additional experimental evidence supporting the molecular origin of the TIESST behavior in these materials.

Graphical abstract: Tuning the spin crossover behavior of the polyanion [(H2O)6Fe3(μ-L)6]6–: the case of the cesium salt

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Publication details

The article was received on 06 Apr 2018, accepted on 05 Jun 2018 and first published on 05 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01339J
Citation: Dalton Trans., 2018,47, 11895-11902
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    Tuning the spin crossover behavior of the polyanion [(H2O)6Fe3(μ-L)6]6–: the case of the cesium salt

    A. Moneo-Corcuera, D. Nieto-Castro, C. Sáenz de Pipaón, V. Gómez, P. Maldonado-Illescas and J. R. Galan-Mascaros, Dalton Trans., 2018, 47, 11895
    DOI: 10.1039/C8DT01339J

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