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Issue 17, 2015
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XPS of guanidinium ionic liquids: a comparison of charge distribution in nitrogenous cations

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Abstract

Herein, we investigate the first X-ray photoelectron spectroscopy (XPS) data for a range of functionalised guanidinium based systems that are commonly employed in the dissolution of biomolecules. We define a peak fitting model which allows the direct comparison to more common cation sets including dialkyl-imidazolium, pyrrolidinium, and quaternary ammonium based systems. The measured binding energies (BEs) of the N 1s and C 1s components are presented and notable variations discussed. These data show a large difference between measured binding energies for the Ncation 1s when compared to other families of ionic liquids. These results suggest a weaker anion/cation interaction thus the anion is more able to interact with a solid matrix, i.e. keratin, silk, chitin, collagen, cellulose, and become more active in dissolution.

Graphical abstract: XPS of guanidinium ionic liquids: a comparison of charge distribution in nitrogenous cations

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The article was received on 20 Feb 2015, accepted on 30 Mar 2015 and first published on 02 Apr 2015


Article type: Paper
DOI: 10.1039/C5CP01069A
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Citation: Phys. Chem. Chem. Phys., 2015,17, 11839-11847
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    XPS of guanidinium ionic liquids: a comparison of charge distribution in nitrogenous cations

    A. R. Santos, R. K. Blundell and P. Licence, Phys. Chem. Chem. Phys., 2015, 17, 11839
    DOI: 10.1039/C5CP01069A

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