Dibutylammonium Hydrogen Oxalate: An Above-Room-Temperature
Order–Disorder Phase Transition Molecular Material
Tariq Khan
Yuanyuan Tang
Zhihua Sun
Shuquan Zhang
Muhammad
Adnan Asghar
Tianliang Chen
Sangen Zhao
Junhua Luo
10.1021/acs.cgd.5b00758.s003
https://acs.figshare.com/articles/dataset/Dibutylammonium_Hydrogen_Oxalate_An_Above_Room_Temperature_Order_Disorder_Phase_Transition_Molecular_Material/2113528
An above-room-temperature new phase
transition molecular material,
dibutylammonium hydrogen oxalate (<b>1</b>), has been synthesized,
which undergoes a reversible phase transition at 321.6 K. Differential
scanning calorimetry (DSC) measurements confirm its reversible phase
transition with a large heat hysteresis of ∼10 K. The dielectric
constants of <b>1</b> exhibit an obvious step-like anomaly,
showing the high and low dielectric constant states at high and room-temperature
phases, respectively, which reveal that <b>1</b> might be considered
a potential switchable dielectric material. Variable-temperature single
crystal X-ray diffraction analyses disclose that the origin of this
phase transition is greatly attributed to the coupling of the order–disorder
change and reorientation of the dibutylammonium cation; that is, the
frozen ordering of ethyl group in butyl moiety triggered by the decreasing
temperature forces the reorientation of cation, thus resulting in
the structural phase transition.
2015-11-04 00:00:00
phase transition
DSC
Dibutylammonium Hydrogen Oxalate
Differential scanning calorimetry
switchable dielectric material