The two percarbonates KHCO, and K2C,06 were prepared by chemical or electrolytic methods in order to measure their infrared and Raman spectra. The permonocarbonate is unstable and very hygroscopic. The HCO; anion forms quite strong intermolecular hydrogen bonds, although somewhat less so than the bicarbonate anion. As for the C,O:-anion, the rather small number of its infrared and Raman bands suggests a planar and centrosymmetric configuration. In both percarbonates the 0-0 vibration shows nearly the same frequency as in H,O,, presumably due to coupling with neighboring vibrations. For comparison purposes the peroxyhydrate K,C0,.3H20, was studied likewise.
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