Journal article
Competitive pi interactions and hydrogen bonding within imidazolium ionic liquids
Physical chemistry chemical physics : PCCP, Vol.16(7), pp.3238-3253
02/21/2014
Handle:
https://hdl.handle.net/2376/105884
PMID: 24407103
Abstract
In this paper we have explored the structural and energetic landscape of potential π(+)-π(+) stacked motifs, hydrogen-bonding arrangements and anion-π(+) interactions for gas-phase ion pair (IP) conformers and IP-dimers of 1,3-dimethylimidazolium chloride, [C1C1im]Cl. We classify cation-cation ring stacking as an electron deficient π(+)-π(+) interaction, and a competitive anion on-top IP motif as an anion-donor π(+)-acceptor interaction. 21 stable IP-dimers have been obtained within an energy range of 0-126 kJ mol(-1). The structures have been found to exhibit a complex interplay of structural features. We have found that low energy IP-dimers are not necessarily formed from the lowest energy IP conformers. The sampled range of IP-dimers exhibits new structural forms that cannot be recovered by examining the ion-pairs alone, moreover the IP-dimers are recovering additional key features of the local liquid structure. Including dispersion is shown to impact both the relative energy ordering and the geometry of the IPs and IP-dimers, however the impact is found to be subtle and dependent on the underlying functional.
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Details
- Title
- Competitive pi interactions and hydrogen bonding within imidazolium ionic liquids
- Creators
- Richard P Matthews - Department of Chemistry, Imperial College London, London, SW7 2AZ, UK. richard.matthews@imperial.ac.uk p.hunt@imperial.ac.ukTom WeltonPatricia A Hunt
- Publication Details
- Physical chemistry chemical physics : PCCP, Vol.16(7), pp.3238-3253
- Academic Unit
- Molecular Biosciences, School of
- Publisher
- England
- Identifiers
- 99900546999801842
- Language
- English
- Resource Type
- Journal article