Abstract
The physical properties and phase transitions of Rb2CuCl4·2H2O and Cs2MnCl4·2H2O crystals were investigated by performing 85Rb, 87Rb, and 133Cs nuclear magnetic resonance relaxation analyses. The temperature dependences of the spectra and the spin–lattice relaxation times T 1 near T C are related to changes in the symmetry of the octahedrons consisting of four Cl− ions and two water molecules around Rb+ or Cs+; the forms of these octahedrons are disrupted by the loss of H2O. The difference between the relaxation times of the two crystals is possibly due to the difference between the electron structures of the Cu and Mn ions. Cu2+ has nine valence electrons in its 3d orbital, whereas Mn2+ has five valence electrons in its 3d orbital.
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