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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| Veröffentlicht in: | Inorganic chemistry Jg. 61; H. 7; S. 3141 |
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| Format: | Journal Article |
| Sprache: | Englisch |
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United States
21.02.2022
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| ISSN: | 1520-510X |
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| Abstract | 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. |
|---|---|
| AbstractList | 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. |
| Author | Carrella, Luca M Nygaard, Mathilde H Overgaard, Jacob Hochdörffer, Tim Kiehl, Jonathan Schünemann, Volker Rentschler, Eva |
| Author_xml | – sequence: 1 givenname: Jonathan surname: Kiehl fullname: Kiehl, Jonathan organization: Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany – sequence: 2 givenname: Tim surname: Hochdörffer fullname: Hochdörffer, Tim organization: Department of Physics, Technische Universität Kaiserslautern, Erwin-Schroedinger-Str. 46, D-67663 Kaiserslautern, Germany – sequence: 3 givenname: Luca M surname: Carrella fullname: Carrella, Luca M organization: Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany – sequence: 4 givenname: Volker surname: Schünemann fullname: Schünemann, Volker organization: Department of Physics, Technische Universität Kaiserslautern, Erwin-Schroedinger-Str. 46, D-67663 Kaiserslautern, Germany – sequence: 5 givenname: Mathilde H surname: Nygaard fullname: Nygaard, Mathilde H organization: Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus, Denmark – sequence: 6 givenname: Jacob orcidid: 0000-0001-6492-7962 surname: Overgaard fullname: Overgaard, Jacob organization: Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus, Denmark – sequence: 7 givenname: Eva orcidid: 0000-0003-1431-3641 surname: Rentschler fullname: Rentschler, Eva organization: Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany |
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| Title | Pronounced Magnetic Bistability in Highly Cooperative Mononuclear [Fe(L npdtz ) 2 (NCX) 2 ] Complexes |
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