In this work, we have determined the structures of lithium methanesulfonate, Li(CH₃SO₃), and potassium methanesulfonate, K(CH₃SO₃), and analysed their vibrational spectra. The lithium salt crystallizes in the monoclinic space group C2/m with two formula units in the primitive cell. The potassium salt is more complex, crystallizing in I4/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 ⁶Li and ⁷Li 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.

在这项工作中，我们确定了甲磺酸锂Li（CH ₃ SO ₃）和甲磺酸钾K（CH ₃ SO ₃）的结构，并分析了它们的振动光谱。锂盐在原始单元中具有两个分子式单元的单斜空间群C 2 / m中结晶。钾盐更复杂，在原始细胞中以12个公式单位以I 4 / m结晶。锂离子在扭曲的四面体中是四重配位，而钾盐则表现出三种配位类型：六，七和九倍。化合物的振动光谱（包括⁶ Li和⁷ Li异构体）证实了先前发现的相关性，即在红外光谱中，甲磺酸根离子的配位形式与未配位形式之间存在明显的区别，在此也是有效的。锂盐显示出非对称S–O拉伸模式的清晰分裂，表明存在键相互作用，而钾盐的光谱中没有分裂，这与纯离子材料一致。