ON THE COMPOSITION OF DILUTE ALKALI METALAMMONIA SOLUTIONS.
Abstract
Dilute solutions of the alkali metals in liquid ammonia are assumed to consist of the following constituents: M+, the solvated metal cation; S, the solvent; M-, the solvated metal anion; S-, the solvent anion (solvated electron); the ion-pairs M+.M- and M+.S-. These species are assumed to be in equilibrium via M+ + 2S- reversibly yields M- + 2S and M+ + A- reversibly yields M+.A-, where A- is either M- or S-. With generally good results being obtained, the foregoing model has been applied to account for the following properties of alkali metal-ammonia solutions which are more dilute than about 0.10 M: (1) the spin paramagnetic susceptibilities reported by Hutchison and Pastor; (2) the vapor-pressure depression results of Kraus; (3) the electrical conductances measured by Kraus and the temperature coefficients of conductance, reported by Gibson and Phipps; (4) the Knight shifts for N14 and Na23, reported by McConnell and Holm, Acrivos and Pitzer and O'Reilly; (5) the optical absorption results of Gold and Jolly, and those of Dye and Douthit. An a postiori argument supports the neglect of ion-triples for the solutions which have been considered, and reinforces a distinction to be made between the metal anion Na- and the analogous ion-triple S-.Na+.S-.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 25, 1964
- Accession Number
- AD0609578
Entities
People
- Charles Guttman
- Sidney Golden
- Thomas R. Tuttle Jr.
Organizations
- Brandeis University