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Room‐Temperature Bistability in a Ni–Fe Chain: Electron Transfer Controlled by Temperature, Pressure, Light, and Humidity
Author(s) -
Reczyński Mateusz,
Pinkowicz Dawid,
Nakabayashi Koji,
Näther Christian,
Stanek Jan,
Kozieł Marcin,
KalinowskaTłuścik Justyna,
Sieklucka Barbara,
Ohkoshi Shinichi,
Nowicka Beata
Publication year - 2021
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.202012876
Subject(s) - valence (chemistry) , cyclam , electron transfer , bistability , atmospheric temperature range , chemistry , analytical chemistry (journal) , phase transition , humidity , materials science , thermodynamics , metal , organic chemistry , optoelectronics , physics
Bistable and stimuli‐responsive molecule‐based materials are promising candidates for the development of molecular switches and sensors for future technologies. The CN‐bridged {NH 4 [Ni(cyclam)][Fe(CN) 6 ]⋅5 H 2 O} n chain exists in two valence states: Ni II ‐Fe III ( 1 HT ) and Ni III ‐Fe II ( 1 LT ) and shows unique multiresponsivity under ambient conditions to various stimuli, including temperature, pressure, light, and humidity, which generate measurable response in the form of significant changes in magnetic susceptibility and color. The electron‐transfer phase transition 1 LT ↔ 1 HT shows room‐temperature thermal hysteresis, can be induced by irradiation, and shows high sensitivity to small applied pressure, which shifts it to higher temperatures. Additionally, it can be reversibly turned off by dehydration to the {NH 4 [Ni II (cyclam)][Fe III (CN) 6 ]} n ( 1 d ) phase, which features the Ni II ‐Fe III valence state over the whole temperature range, but responds to pressure by yielding Ni III ‐Fe II above 1.06 GPa.