Proton Magnetic Resonance Study of the Structure of Barium Chloride Dihydrate

The proton magnetic resonance absorption spectrum of barium chloride dihydrate has been obtained experimentally at room temperature using a Pound-Watkins spectrometer. The results indicate that there are four pairs of p—p directions in the crystal. The p—p distance and direction angles of these four pairs are: 1.58 A, α0=90°, β0=58°, γ0=148°; 1.58 A, α0=90°, β0=58°, γ0=32°; 1.59A, α0=148°, β0=58°, γ0=90°; 1.57 A, α0=32°, β0=58°, γ0=90°. The experimental error for the p—p distance is ±0.02 A and for the direction angles it is ±4°. By using experimental data, x-ray analysis, and the concept of hydrogen bonding the positions of the hydrogen atoms were determined.