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RESEARCH ARTICLE
Contents Vol 72(2)

Crystal Polymorphs and Multiple Crystallization Pathways of Highly Pressurized 1-Ethyl-3-Methylimidazolium Nitrate

Hiroshi Abe A D , Takahiro Takekiyo B , Yukihiro Yoshimura B , Nozomu Hamaya C and Shinichiro Ozawa A
+ Author Affiliations
- Author Affiliations

A Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan.

B Department of Applied Chemistry, National Defense Academy, Yokosuka 239-8686, Japan.

C Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo 112-8610, Japan.

D Corresponding author. Email: ab@nda.ac.jp

Australian Journal of Chemistry 72(2) 87-92 https://doi.org/10.1071/CH18368
Submitted: 28 July 2018  Accepted: 15 September 2018   Published: 9 October 2018

Abstract

Crystal polymorphs and multiple crystallization pathways of a room-temperature ionic liquid (RTIL) were observed only under high pressure (HP). The RTIL was 1-ethyl-3-methylimidazolium nitrate, [C2mim][NO3]. The HP-crystal polymorphs were related to conformations of the C2mim+ cation, and the HP-crystal pathways determined by the presence or absence of the planar′ (P′) conformation of the C2mim+ cation were switched at the bifurcation pressure (PB). Above PB, modulated crystal structures derived from the HP-inherent P′ conformer. Simultaneous X-ray diffraction and differential scanning calorimetry measurements, accompanied by optical microscope observations, confirmed the normal low-temperature crystallization of [C2mim][NO3] under ambient pressure.


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