Proton magnetic resonance absorption of water molecules in the single crystal of Li
2SO
4·H
2O was observed, and the length and directions of the proton–proton line (p–p) of the water of crystallization were determined. The results obtained are as follows: there are two kinds of orientations of the p–p line in the unit cell, which contains two molecules of Li
2SO
4·H
2O, and they are symmetrically disposed with respect to the
ac-plane, the plane of mirror, making the angles ±51° to that plane.
The angle between the projection of each p–p line on the
ac-plane and the positive direction of
a-axis is 94°, and the length of p–p line is 1.59 Å.
From the results obtained and the crystal structure by X-ray analysis, the bond angle of H–O–H is expected to lie between 106°50′ and 112°40′, and presumably some value nearer to 112°40′ may be taken to be favorable from the consideration of the bonding character.
The single crystals were prepared by a slow evaporation method from an aqueous solution in a water bath at 80°C.
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