Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 33, Pages 15244-15255Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1cp21053j
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Funding
- EPSRC [EP/D501229/1]
- ARF [EP/D073014/1]
- Engineering and Physical Sciences Research Council [EP/D073014/1, EP/D501229/1] Funding Source: researchfish
- EPSRC [EP/D073014/1] Funding Source: UKRI
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We investigate seven 1-alkyl-1-methylpyrrolidinium- based ionic liquids, [C(n)C(1)Pyrr][X], using X-ray photoelectron spectroscopy (XPS). The electronic environment for each element is analysed and a robust fitting model is developed for the C 1s region that applies to each of the ionic liquids studied. This model allows accurate charge correction and the determination of reliable and reproducible binding energies for each ionic liquid studied. The electronic interaction between the cation and anion is investigated for ionic liquids with one and also two anions. i.e., mixtures. Comparisons are made to imidazolium-based ionic liquids; in particular, a detailed comparison is made between [C(8)C(1)Pyrr][X] and [C(8)C(1)Im][X](-), where X- is common to both ionic liquids.
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