Based on the known experimental frequencies of three isotopic forms of the crystal hydrates M⋅Cl2⋅2H2O(M=Mn, Co, Fe, and Cu), the force constants of the M2+⋅OH2⋅2Cl− complexes are determined by solving the inverse spectral problems. A quantitative estimate is made of how the divalent cation interacting with the water molecule affects its dynamic properties. It is shown that the presence of the M2+ cation in the region of the undivided electron pairs of the H2O molecule increases the interaction force constant of its bonds by 0.065×106 cm−2. This value is an order of magnitude smaller than the change of the indicated force constant in hexagonal ice, caused by the influence of two adjacent proton-donor molecules on the water molecule. © 2005 Optical Society of America
G. V. Yukhnevich, E. G. Tarakanova, and V. Stefov, "The effect of divalent cations on the vibrational properties of the water molecule in crystal hydrates," J. Opt. Technol. 72, 423-425 (2005)
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