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Large Breathing Effect Induced by Water Sorption in the Exceptionally Stable Nonporous Non-MOF Crystalline Material

submitted on 26.01.2021, 13:29 and posted on 28.01.2021, 07:10 by Michał Magott, Bartłomiej Gaweł, Marcin Sarewicz, Mateusz Reczyński, Karolina Ogorzały, Wacław Makowski, Dawid Pinkowicz
We report a non-MOF crystalline material {[Mn(imH)]2[Mo(CN)8]}n (imH = imidazole) with exceptional water sorption properties and a very large breathing effect accompanied by an outstanding stability and cyclability – properties that are absolutely unique for this class of compounds (Prussian Blue Analogs). Some previously published PBAs indeed show some sorption properties, but their cyclability is extremely limited - usually 1-3 cycles - followed by significant decomposition/amorphization. Our compound can be cycled more than 50 times without any fatigue and the sorption/desorption proceeds through four different crystal phases, which we have fully characterized structurally enabling the complete understanding of the sorption and breathing mechanism in this material - an achievement rarely reported for MOFs or PBAs.
The unique structure of {[Mn(imH)]2[Mo(CN)8]}n enables very strong coupling of its exceptional water sorption performance with the magnetic and photomagnetic properties of the framework, e.g. the sorption process can be followed by in-situ EPR spectroscopy with huge changes in the EPR signal intensity depending on the hydration level.


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Email Address of Submitting Author


Jagiellonian University, Faculty of Chemistry



ORCID For Submitting Author


Declaration of Conflict of Interest

No conflicts to declare

Version Notes

Version 1.0 after internal review and before submission to a scientific journal.