Proton Magnetic Resonance in Hydrates of Halogen Compounds of Mg, Ca, Sr and Ba
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概要
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Proton resonance in crystal water of Mg(H_2O)_6Cl_2, Mg(H_2O)_6Br_2, CaI_26H_2O, SrI_26H_2O and MgI_28H_2O was studied in temperature range from -90℃ to + 110℃ and the same in CaCl_26H_2O, CaBr_26H_2O, SrCl_26H_2O and SrBr_26H_2O was studied in the range above room temperature, all in powdered states. Line shapes were recorded by the radiofrequency spectrometer with an automatic field scanning apparatus connected to the sweeping coils of a permanent magnet. Transitions of second moment and line shapes were observed for all the above salts. Experiments on single crystals of Mg(H_2O)_6Cl_2 and CaI_26H_2O were also carried out at room temperature. In Mg(H_2O)_6Cl_2, Mg(H_2O)_6Br_2, CaI_26H_2O, SrI_26H_2O and BaI_26H_2O, water molecules of hydration have the states of hindered rotational motion below melting point, but in CaCl_26H_2O, CaBr_26H_2O, SrCl_26H_2O and SrBr_26H_2O, these rotational states were not observed. The angle between the rotational axis of a water molecule and its inter-proton direction was estimated to be about 90° in the case of Mg(H_2O_6Cl_2. In the cases of CaI_26H_2O and SrI_26H_2O these angles are calculated to be 45° or 60°, and these results suggest the precession of the rotational axis, if rotational motion of water molecules is assumed to occur about an axis perpendicular to the inter-proton axis. Sharp peaks appearing in chlorides and bromides of Ca and Sr are interpreted as the narrowing due to random re-orientation of the rotational axis.
- 社団法人日本物理学会の論文
- 1959-07-05