Nuclear Magnetic Resonance Experiment on the Single Crystals of K2HgCl4$\cdot$H2O and K2SnCl4$\cdot$H2O

概要

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The energy levels and the transition probabilities are calculated for four proton interaction. The result of calculation is applied to the case of the single crystals of K2HgCl4$\cdot$H2O and K2SnCl4$\cdot$H2O. Ten absorption lines are expected from the theoretical calculation, of which each five form a group. Since in general cases the separations between the lines belonging to one of these groups are small compared to the separation between these groups as a whole, the expected resonance figure roughly coincides with the case of two proton resonance. But the shapes of resonance peaks have further fine structures. The observed fine structures were analysed by the theoretical consideration, and it is shown that the agreement between the theory and the experiment is satisfactory, if we take the distance of main protons to be 1.607 Å and the distance between the proton-proton lines for adjacent water molecules which are parallel with each other to be 3.60 Å in the case of Hg-salt and 1.62 Å and 3.90 Å respectively in the case of Sn-salt. From these results, the positions of the oxygen atoms in the crystal lattice may be determined with a few assumptions, and the probable space group of K2SnCl4$\cdot$H2O will be $V{_{h}}^{9}$–Pbam which is identical to that of K2HgCl4$\cdot$H2O contrary to the previous X-ray determination.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
1953-05-25