The proton magnetic resonance absorption spectrum of monocrystalline potassium pentaborate has been obtained experimentally at room temperature using a Pound-Watkins spectrometer. The results indicate that there are two waters of hydration per molecule. The interproton distance is 1.60±0.02 A. The p—p axes lie in the b—c plane of the crystal and make an angle of 93°±4° with each other. Using experimental data together with consideration of interatomic distances and hydrogen bonding the remaining hydrogens are tentatively located in the molecule.
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Silvidi et al. (1959) studied this question.
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