Driving Barocaloric Effects in a Molecular Spin-Crossover Complex at Low PressuresClick to copy article linkArticle link copied!
- Jinyoung SeoJinyoung SeoDepartment of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United StatesMore by Jinyoung Seo
- Jason D. BraunJason D. BraunDepartment of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United StatesMore by Jason D. Braun
- Vidhya M. DevVidhya M. DevDepartment of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United StatesMore by Vidhya M. Dev
- Jarad A. Mason*Jarad A. Mason*Email: [email protected]Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United StatesMore by Jarad A. Mason
Abstract
Barocaloric effects─thermal changes in a material induced by applied hydrostatic pressure─offer promise for creating solid-state refrigerants as alternatives to conventional volatile refrigerants. To enable efficient and scalable barocaloric cooling, materials that undergo high-entropy, reversible phase transitions in the solid state in response to a small change in pressure are needed. Here, we report that pressure-induced spin-crossover (SCO) transitions in the molecular iron(II) complex Fe[HB(tz)3]2 (HB(tz)3– = bis[hydrotris(1,2,4-triazol-1-yl)borate]) drive giant and reversible barocaloric effects at easily accessible pressures. Specifically, high-pressure calorimetry and powder X-ray diffraction studies reveal that pressure shifts as low as 10 bar reversibly induce nonzero isothermal entropy changes, and a pressure shift of 150 bar reversibly induces a large isothermal entropy change (>90 J kg–1 K–1) and adiabatic temperature change (>2 K). Moreover, we demonstrate that the thermodynamics of the SCO transition can be fine-tuned through systematic deuteration of the tris(triazolyl)borate ligand. These results provide new insights into pressure-induced SCO transitions and further establish SCO materials as promising barocaloric materials.
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