The spectra of liquid ammonia solutions of the alkali and alkaline earth iodides, except Ca12, exhibit an absorption band at about 2500 A, the position and intensity of which is temperature dependent; the position of the band is also dependent upon the concentration of added inert salt. Analysis of the data indicates that the band arises from a chargetransfer-to-solvent transition. The absence of this band in solutions of CaIz suggests that a molecular complex is present in this system. IntroductionThe position of the first ultraviolet absorption band for the iodide ion is solvent and temperature dependent; this band has been described as arising by a charge-transfer-to-solvent (ctts) mechanism.' We present here the results of a detailed study of the ultraviolet absorption band reported2 for iodide ions in liquid ammonia which support this model.

No abstract

No abstract