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Two novel phase transition materials,[C_9H_(20)N_2][Na(BF_4)_3](1) and[C_9H_(20)N_2][(PF_6)_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 P6_3 to a low temperature one with a space group of P2_1/c,and that compound 2transformed from the space group of Pbca at room temperature to P2_1/c at low temperature.Formation of hydrogen bonds and distortion of l,4-diazabicyclo[2.2.2]octane rings may drive the transitions.
Two novel phase transition materials [C_9H_ (20) N_2] [Na (BF_4) _3] (1) and [C_9H_ (20) N_2] [(PF_6) _2] , 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 P6_3 to a low temperature one with space group of P2_1 / c, and that compound 2 formed from the space group Pbc at room temperature to P2_1 / c at low temperature.Formation of hydrogen bonds and distortion of l, 4-diazabicyclo [2.2.2] octane rings may drive the transitions.