Proton Magnetic Resonance in Cupric Formate Tetrahydrate, Cu(HCO2)2·4H2O

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Abstract
The proton magnetic resonance spectra of Cu(HCO2)2·4H2O have been investigated over the range 110° to 315°K, using both single crystal and powdered samples. The water molecules are effectively rigid below the phase transition temperature, 237°K, and the most probable positions of the protons of the two non-equivalent water molecules are postulated on the basis of Pake’s method. The narrowing of the absorption line occurs above 237°K; this implies the gradual onset of a certain motion of both kinds of water molecules. The absorption spectra in the higher temperature range of 300∼315°K indicate that the reorientation of the water molecules takes place almost exclusively about one axis.