Citation: . Two novel phase transition materials based on 1-isopropyl-1,4-diazabicyclo[2.2.2]octan-1-ium[J]. Chinese Chemical Letters, ;2017, 28(2): 400-406. doi: 10.1016/j.cclet.2016.10.037 shu

Two novel phase transition materials based on 1-isopropyl-1,4-diazabicyclo[2.2.2]octan-1-ium

Received Date: 1 September 2016
Revised Date: 16 October 2016
Accepted Date: 20 October 2016
Available Online: 2 February 2016

Figures(12)

Two novel phase transition materials,[C₉H₂₀N₂] [Na(BF₄)₃] (1) and[C₉H₂₀N₂] [(PF₆)₂] (2), were synthesized based on 1-isopropyl-1,4-diazabicyclo[2.2.2]octan-1-ium with sodium tetrafluoroborate and hexafluorophosphoric acid, respectively. Differential scanning calorimetry measurements detected that 1 and 2 underwent reversible phase transitions, which were confirmed by dielectric measurements. Single crystal X-ray diffraction data suggested that compound 1 changed from a high temperature phase with a space group of P6₃ to a low temperature one with a space group of P2₁/c, and that compound 2 transformed from the space group of Pbca at room temperature to P2₁/c at low temperature. Formation of hydrogen bonds and distortion of 1,4-diazabicyclo[2.2.2]octane rings may drive the transitions.
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