These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
(CH3)2NH2[Cu(Formate)3]_HP.pdf (3.5 MB)

Pressure-Induced Jahn-Teller Switch in the Homoleptic Hybrid Perovskite [(CH3)2NH2]Cu(HCOO)3: Orbital Reordering by Unconventional Degrees of Freedom

submitted on 22.04.2021, 11:37 and posted on 23.04.2021, 05:27 by Rebecca Scatena, Michał Andrzejewski, Roger Johnson, Piero Macchi

Through in-situ, high-pressure x-ray diffraction experiments we have shown that the homoleptic perovskite-like coordination polymer [(CH3)2NH2]Cu(HCOO)3 undergoes a pressure-induced orbital reordering phase transition above 5.20 GPa. This transition is distinct from previously reported Jahn-Teller switching in coordination polymers, which required at least two different ligands that crystallize in a reverse spectrochemical series. We show that the orbital reordering phase transition in [(CH3)2NH2]Cu(HCOO)3 is instead primarily driven by unconventional octahedral tilts and shifts in the framework, and/or a reconfiguration of A-site cation ordering. These structural instabilities are unique to the coordination polymer perovskites, and may form the basis for undiscovered orbital reorientation phenomena in this broad family of materials.


Federal support to the Swiss National Science Foundation (SNSF)

Federal Department of Economic Affairs Education and Research

Find out more...


Email Address of Submitting Author


University of Oxford


United Kingdom

ORCID For Submitting Author


Declaration of Conflict of Interest

The authors declare no conflict of interests.