Reflection spectra of (alkali metal, thallium (I), silver (I)) iridium (IV) hexachlorides

Author: Jørgensen Chr.  

Publisher: Taylor & Francis Ltd

ISSN: 1362-3028

Source: Molecular Physics, Vol.4, Iss.3, 1961-05, pp. : 235-239

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Abstract

While the effect of rubidium and caesium ions in solid salts of IrCl 6 -- is a shift to lower wave-numbers, comparable to that occurring in organic solvents relative to water, the dark blue silver (I) and thallium (I) salts have a new, broad band in the red. Mixed crystals of Cs 2 IrCl 6 and Tl 2 IrCl 6 are prepared, and the absorption spectra are discussed in terms of a tendency to ‘ferroelectric rattling' and strong covalent bonding of Ag and Tl. Analogous cases are pointed out in solid salts of other 5 d -hexahalides.