Journal article
Directing Long-Range Molecular Ordering in Ionic Liquid Films: A Tale of Two Interfaces
Journal of physical chemistry. C, Vol.123(14), pp.8975-8982
04/11/2019
DOI: 10.1021/acs.jpcc.8b12575
Abstract
We report surface-dependent, long-range ordering behavior of two ionic liquids, 1-butyl-1-methylpyrrolidinium tetracyanoborate (P14 B(CN)4) and 1-butyl-1-methylpyrrolidinium dicyanamide (P14 N(CN)2). The ionic liquids are supported as liquid films and examined using vibrational spectroscopy and spectroscopic ellipsometry. Both systems show changes in the infrared peak profile characteristic of major dipole reorientations for both anions, but the changes observed are in different spectral regions. Specifically, tetracyanoborate shows changes in the B–C stretching modes, and dicyanamide displays changes in the C≡N and N–C modes. Surprisingly, B(CN)4 induces a final film environment, which is identical to the solid–liquid interfacial orientation. However, the N(CN)2 indicates propagation of the gas–liquid interfacial environment through the film toward the solid substrate. The extent of ordering within the films extends to 0.4 and 1.1 μm for P14 N(CN)2 and P14 B(CN)4, respectively. This observation is intriguing as it presents a possibility for controlling molecular (re)orientations at 100 s of nanometer scales by tuning fundamental intermolecular interactions at surfaces. These results for the cyano-functionalized anions should be generally applied for other systems, contributing directly to a better understanding and design for applications in molecular electronics, lubrication, and energy storage devices.
Details
- Title: Subtitle
- Directing Long-Range Molecular Ordering in Ionic Liquid Films: A Tale of Two Interfaces
- Creators
- Radhika S AnaredyScott K Shaw
- Resource Type
- Journal article
- Publication Details
- Journal of physical chemistry. C, Vol.123(14), pp.8975-8982
- DOI
- 10.1021/acs.jpcc.8b12575
- NLM abbreviation
- J Phys Chem C Nanomater Interfaces
- ISSN
- 1932-7447
- eISSN
- 1932-7455
- Publisher
- American Chemical Society
- Grant note
- DOI: 10.13039/100009494, name: Research Corporation for Scientific Advancement; DOI: 10.13039/100000165, name: Division of Chemistry, award: CHE-1651381
- Language
- English
- Date published
- 04/11/2019
- Academic Unit
- Chemistry
- Record Identifier
- 9983985853302771
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