期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 1, 期 14, 页码 2561-2567出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc30166d
关键词
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资金
- NSFC [51102231, 21222102, 21171166]
- Chinese Academy of Sciences
- MOST [2010CB933501, 2011CB935904]
- Key Project of Fujian Province [2012H0045]
- Haixi Institute of Chinese Academy of Sciences [CMZX-2013-002]
An organic supramolecular co-crystal with a perovskite-like architecture, dabco.p-nitrophenol (1, dabco = 1,4-diazabicyclo[2.2.2]octane), which undergoes a reversible ferroelastic phase transition with the Aizu notation of 2/mF (1) over bar at around 128 K (T-c), displays switchable dielectric behaviors triggered by the ordering of molecular rotational motion in the dabco moieties. Its transition dynamic behaviors were investigated by variable-temperature crystal structure analysis, thermal analysis and dielectric measurements. The results reveal that in the high-temperature state, 1 behaves as a molecular rotor, in which the dabco moiety rotates around the N center dot center dot center dot N axis as a rotator, and the neutral p-nitrophenol part acts as a stator jointed through the intermolecular N-H center dot center dot center dot OH-bonds. Below the T-c, the rotational motions of the rotator are frozen and the whole setup becomes much more ordered, corresponding to its low-temperature stable phase. Moreover, study of the deuterated analogue of 1 excludes the possibility of proton movement along N-H center dot center dot center dot O bonds as the microscopic origin of the phase transition. The findings provide a useful strategy to explore a new class of compounds exhibiting distinct switchable dielectric performances for application in the ferroic-related field.
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