期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 37, 页码 11924-11927出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b07879
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资金
- EU (ERC Stg grant) [279313]
- Spanish Ministerio de Economia y Competitividad (MINECO) through Severo Ochoa Excellence Accreditation [SEV-2013-0319]
- ICIQ Foundation
- ICREA Funding Source: Custom
Reaction of the polysulfonated triazole ligand L = 4-(1,2,4-triazol-4-yl)ethanedisulfonate) with iron(II) salts in water yields the trimeric species [Fe-3(mu-L)(6)(H2O)(6)](6-). This polyanion, as the dimethylammonium salt, shows a thermally induced spin transition above room temperature for the central Fe position in the trimer with a large hysteresis cycle (>85 K) and remarkably slow dynamics. This allows easy quenching of the metastable high-spin (HS) state via gradual cooling (5 K min(-1)). Once it is trapped, the HS state remains metastable. Thermal energy is not able to promote relaxation into the low-spin ground state below 215 K, with a characteristic T-TIESST = 250 K, the highest temperature ever observed for thermal trapping of an excited spin state in a switchable molecular material.
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