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Temperature‐Induced Irreversible Phase Transition From Perovskite to Diamond But Pressure‐Driven Back‐Transition in an Ammonium Copper Formate
Author(s) -
Shang Ran,
Chen Sa,
Wang BingWu,
Wang ZheMing,
Gao Song
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201510024
Subject(s) - formate , phase transition , metastability , copper , diamond , chemistry , crystallography , ambient pressure , materials science , organic chemistry , condensed matter physics , thermodynamics , catalysis , physics
The compound [CH 3 CH 2 NH 3 ][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.