Citation: Dong-Yan Wang, Li-Li Qin, Xue-Li Hou, Heng-Yun Ye. Temperature-triggered phase transition in pyridazine hexafluorophosphate[J]. Chinese Chemical Letters, ;2015, 26(1): 145-148. doi: 10.1016/j.cclet.2014.09.024 shu

Temperature-triggered phase transition in pyridazine hexafluorophosphate

1.
Ordered Matter Science Research Center, Southeast University, Nanjing 211189, China

Corresponding author: Heng-Yun Ye,
Received Date: 10 August 2014
Available Online: 18 September 2014
Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 91222101). Also we gratefully thank Prof. Ren-Gen Xiong for revising this manuscript. (No. 91222101)

The pyridazine hexafluorophosphate [C₄H₅N₂]+[PF₆]^- (1) undergoes a reversible phase transition around 140 K, which was confirmed by the DSC measurement. Variable-temperature crystal structures determined at 293 K and 93 K show that the compound crystallizes in the same space group P2_1/c, indicating that 1 undergoes an iso-structural phase transition. As the temperature decreases, dielectric measurement of the title compound shows no significant change around the phase transition temperature. Classic hydrogen bonds are found between molecules at 293 K and 93 K with similar packing arrangement. Themost distinct difference between the low temperature and room temperature structures is the order-disorder transition of the hexafluorophosphate anion, which is probably the driving force of the phase transition.
- Phase transition,
- Dielectric,
- DSC,
- Crystal structure
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沈阳化工大学材料科学与工程学院沈阳 110142