NDLI: N-Methylpyrrolidinium hydrogen tartrate (NMPHT): an above-room-temperature order–disorder molecular switchable dielectric material

Content Provider	Royal Society of Chemistry (RSC)
Author	Sun, Zhihua Zhao, Sangen Zeb, Aurang Asghar, Muhammad Adnan Luo, Junhua Wu, Zhenyue Khan, Tariq
Copyright Year	2017
Abstract	A novel molecular switchable dielectric material N-methylpyrrolidinium hydrogen tartrate (NMPHT) has been synthesized, which undergoes above room temperature phase transition. Thermal measurements, e.g. differential scanning calorimetry and specific heat, confirm the presence of a phase transition around 317.5 K. The dielectric measurement displays a distinct step-like anomaly around Tc, showing two different dielectric states, which reveals that NMPHT is a switchable dielectric material. The single-crystal X-ray diffraction analyses at variable temperatures demonstrate that the phase transition emerges from the severe disordering of the N-methylpyrrolidinium (NMP) cation, and during the transition the symmetry of NMPHT is transformed from higher (C2/c) to lower (P21/n). These findings will provide a new horizon to design smart dielectric structural phase transition materials by incorporating a flexible NMP based scaffold.
Starting Page	24368
Ending Page	24373
Page Count	6
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	7
Issue Number	39
Journal	RSC Advances
DOI	10.1039/c7ra00689f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	NMP X-ray crystallography Differential scanning calorimetry Heat capacity Ion Dielectric Hydrogen bond Phase transition
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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