Work

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

Year: 2026

Type: preprint

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.

Source: ChemRxiv

DOI: 10.26434/chemrxiv.15001756/v3

Authors: Matthew G. Robb, Anthony E. Phillips, Lukas Sippach, Andreas Rydh, Gregor Kieslich, Hanna L B Boström

Institutions: Stockholm University, Queen Mary University of London, Justus-Liebig-Universität Gießen

Language: English

Topic: Magnetism in coordination complexes

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Deutsches Elektronen-Synchrotron

Award: Tilt engineering of Prussian blue analogues towards new multiferroics

OpenAlex ID: W7220835899

Cites: 13

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Related to: 10