Pronounced Magnetic Bistability in Highly Cooperative Mononuclear [Fe(L npdtz ) 2 (NCX) 2 ] Complexes
Molecular materials that exhibit stimuli-responsive bistability are promising candidates for the development of molecular switches and sensors. We herein report on the coexistence of a wide thermal hysteretic spin crossover (SCO) effect and a thermally inducible metastable high-spin state at low tem...
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| Vydané v: | Inorganic chemistry Ročník 61; číslo 7; s. 3141 |
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| Hlavní autori: | , , , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
| Vydavateľské údaje: |
United States
21.02.2022
|
| ISSN: | 1520-510X |
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| Shrnutí: | Molecular materials that exhibit stimuli-responsive bistability are promising candidates for the development of molecular switches and sensors. We herein report on the coexistence of a wide thermal hysteretic spin crossover (SCO) effect and a thermally inducible metastable high-spin state at low temperatures achieved with the two new complexes [Fe
(L
)
(NCX)
] (X = S; Se), with L
being (2-naphthyl-5-pyridyl-1,2,4-thiadiazole) and X = S (
) and Se (
). Pronounced π-π-stacking of the aromatic side residues of the ligands enables strong intermolecular interactions, leading to abrupt SCO properties and broad magnetic hysteresis of 10 K for X = S and 58 K for X = Se. In this paper, we also present the pressure-induced spin-state switching around 0.8 GPa. A pronounced thermally induced excited spin state trapping (TIESST effect) is observed for the highly cooperative SCO compounds, which was experimentally followed by low-temperature single crystal structure analysis (20 K) and temperature-dependent Mössbauer spectroscopy. |
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| ISSN: | 1520-510X |
| DOI: | 10.1021/acs.inorgchem.1c03491 |