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- Title
Temperature-Induced Irreversible Phase Transition From Perovskite to Diamond But Pressure-Driven Back-Transition in an Ammonium Copper Formate.
- Authors
Shang, Ran; Chen, Sa; Wang, Bing-Wu; Wang, Zhe-Ming; Gao, Song
- Abstract
The compound [CH3CH2NH3][Cu(HCOO)3] undergoes a phase transition at 357 K, from a perovskite to a diamond structure, by heating. The backward transition can be driven by pressure at room temperature but not cooling under ambient or lower pressure. The rearrangement of one long copper-formate bond, the switch of bridging-chelating mode of the formate, the alternation of N−H⋅⋅⋅O H-bonds, and the flipping of ethylammonium are involved in the transition. The strong N−H⋅⋅⋅O H-bonding probably locks the metastable diamond phase. The two phases display magnetic and electric orderings of different characters.
- Subjects
PEROVSKITE synthesis; COPPER compounds synthesis; PHASE transitions; METAL-organic frameworks; AMMONIUM compounds; FORMATES; REARRANGEMENTS (Chemistry)
- Publication
Angewandte Chemie International Edition, 2016, Vol 55, Issue 6, p2097
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201510024