Affiliation:
1. ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK
2. Europa School UK, Thame Lane, Culham OX14 3DZ, UK
Abstract
In this work, we have determined the structures of lithium methanesulfonate, Li(CH
3
SO
3
), and potassium methanesulfonate, K(CH
3
SO
3
), and analysed their vibrational spectra. The lithium salt crystallizes in the monoclinic space group
C
2/
m
with two formula units in the primitive cell. The potassium salt is more complex, crystallizing in
I
4/
m
with 12 formula units in the primitive cell. The lithium ion is fourfold coordinated in a distorted tetrahedron, while the potassium salt exhibits three types of coordination: six-, seven- and ninefold. Vibrational spectroscopy of the compounds (including the
6
Li and
7
Li isotopomers) confirms that the correlation previously found, that in the infrared spectra there is a clear distinction between coordinated and not coordinated forms of the methanesulfonate ion, is also valid here. The lithium salt shows a clear splitting of the asymmetric S–O stretch mode, indicating a bonding interaction, while there is no splitting in the spectrum of the potassium salt, consistent with a purely ionic material.
Funder
Science and Technology Facilities Council
Cited by
2 articles.
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