Vibrational spectra of halides and complex halides. Part II. Hexachlorostannates and -plumbates

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Abstract
Far-infrared (60—4000 cm.–1) and laser-Raman spectra of solid complexes MI 2[MCl6](M = Sn and Pb) are reported. Force constants are calculated on the basis of a modified Urey–Bradley force field and show a general decrease with increase in cation size. Some cation lattice modes are reported and found to decrease with increase in cation mass.