Ultrasonic velocities in aqueous solutions of some metal acetates, monochloroacetates and trichloroacetates, and the respective acids have been measured at 1 MHz frequency using the pulse technique. The ultrasonic velocity, adiabatic compressibility and apparent molal compressibility were measured as a function of concentration. The apparent molal compressibility values at infinite dilution were calculated and used to determine the hydration numbers. The hydration numbers obtained are, CHaCOOH(I-IP) =3"1,
The lanthanide mandelates have been prepared by reacting the lanthanide hydroxides with mandelic acid (HL). The coordination number in these compounds has been discussed on the basis of analytical, infrared and electronic spectral, and thermal data. The mandelates have the general formula, LnL3.nH2O, where n3 for LnLa, Pr, Nd and Sm, and n=2 for LnGd, Dy, Br, Yb and Y. The infrared spectral data reveal that the mandelate ion is coordinated to the lanthanide ions in a bidentate fashion through the oxygen atoms of the carboxylate and the hydroxyl groups. The antisymmetric COO−, the δ OH, and the Ln‐O frequencies in the mandelates show a linear relationship with the ionic radius of the lanthanide ions. The infrared spectral and thermal data afford evidence of the coordination of all the molecules of water to the lanthanide ions. Hence, coordination numbers nine and eight have been assigned to the two sets of mandelates. This conclusion is supported by a study of the shapes of the hypersensitive transitions in the electronic absorption spectra of Nd and Br mandelates. The electronic spectra also suggest that the bonding in these compounds is predominantly ionic.
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