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PreprintCC BYChemRxiv

Giant barocaloric effect from spin crossover in a green nitroprusside framework†

  • Matthew G. Robb1,2,3
  • Anthony E. Phillips4,5
  • Lukas Sippach6
  • Andreas Rydh7,3
  • Gregor Kieslich6
  • Hanna L B Boström
7 affiliations
  1. 1Department of Chemistry, Stockholm University, Svante Arrhenius väg 16C, Stockholm, Sweden, SE-106 91
  2. 2Department of Chemistry
  3. 3Stockholm University
  4. 4School of Physical and Chemical Sciences
  5. 5Queen Mary University of London
  6. 6Institute of Inorganic and Analytical Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, Giessen, Germany, 35392
  7. 7Department of Physics
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Abstract

The interest in spin crossover for solid-state cooling is growing. We investigate the spin crossover transitions of [Fe(pyridine)2Fe(CN)5NO] and [Fe(pyrazine)Fe(CN)5NO] by single-crystal X-ray diffraction, high-pressure X-ray diffraction, magnetometry, and high-pressure calorimetry. The dehydrated form of the latter compound shows a reversible cooling effect (∆Tad,rev) of ∼15K at 1.2 kbar. This is high in the context of other reported spin-crossover barocalorics, and competitive within the field at large. The excellent performance results from a large barocaloric coefficient (dT1/2/dp = 35K kbar−1). In addition, the one-pot synthesis is simple and free from toxic solvents.

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Cite

BibTeXRIS
BibTeX
@misc{robb2026giant,
  title = {{Giant barocaloric effect from spin crossover in a green nitroprusside framework†}},
  author = {Matthew G. Robb and Anthony E. Phillips and Lukas Sippach and Andreas Rydh and Gregor Kieslich and Hanna L B Boström},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15001756/v3},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15001756/v3},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Giant barocaloric effect from spin crossover in a green nitroprusside framework†
AU  - Matthew G. Robb
AU  - Anthony E. Phillips
AU  - Lukas Sippach
AU  - Andreas Rydh
AU  - Gregor Kieslich
AU  - Hanna L B Boström
PY  - 2026
DA  - 2026/10/07
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15001756/v3
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15001756/v3
AB  - The interest in spin crossover for solid-state cooling is growing. We investigate the spin crossover transitions of [Fe(pyridine)2Fe(CN)5NO] and [Fe(pyrazine)Fe(CN)5NO] by single-crystal X-ray diffraction, high-pressure X-ray diffraction, magnetometry, and high-pressure calorimetry. The dehydrated form of the latter compound shows a reversible cooling effect (∆Tad,rev) of ∼15K at 1.2 kbar. This is high in the context of other reported spin-crossover barocalorics, and competitive within the field at large. The excellent performance results from a large barocaloric coefficient (dT1/2/dp = 35K kbar−1). In addition, the one-pot synthesis is simple and free from toxic solvents.
ER  -