In:
Magnetic Resonance in Chemistry, Wiley, Vol. 47, No. 1 ( 2009-01), p. 67-70
Abstract:
The 13 C spectra and 13 C longitudinal relaxation times ( T 1 ) were measured to investigate the segmental motion of the neat ionic liquid 1‐butyl‐3‐methylimidazolium bromide ([bmim]Br) in the super cooled state. The 13 C signals of the imidazole ring significantly broadened at 283 K, whereas many other signals were unchanged. In the process of lowering temperature, the [bmim]Br changed to the solid state at ca 273 K without showing the rapid phase transition. Only the 13 C signal of the terminal methyl group in the butyl chain was still observed at 263 K, indicating that the motion of the imidazole ring was extremely restricted, whereas the methyl group in the butyl chain was active even in the solid state. The 13 C‐ T 1 values measured as a function of temperature also supported the discrete segmental motions of the [bmim] + cation. Copyright © 2008 John Wiley & Sons, Ltd.
Type of Medium:
Online Resource
ISSN:
0749-1581
,
1097-458X
Language:
English
Publisher:
Wiley
Publication Date:
2009
detail.hit.zdb_id:
1475029-6
Permalink