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Infrared and Raman spectra of lithium and ammonium nitrate solutions in liquid ammonia

1973; American Institute of Physics; Volume: 59; Issue: 1 Linguagem: Inglês

10.1063/1.1679789

1520-9032

Derek J. Gardiner, Ronald E. Hester, William Ε. L. Grossman,

Chemical and Physical Properties in Aqueous Solutions

Vibrational spectra, most of them obtained from Raman scattering, are reported for LiNO3 and NH4NO3 solutions in liquid ammonia, ranging from dilute to the compositions LiNO3/1.6NH3 and NH4NO3/1NH3. All the spectra were obtained from solutions at ambient temperatures. Large changes in the N–H stretching region are correlated with the effects of the electrolytes on the solvent structure. Low-frequency bands associated with Li–NH3 modes are identified. Spectral features indicative of both solvent-separated and contact ion pairs involving Li+ and NO3− are analyzed. Contact ion pairing between NH4+ and NO3− ions in this solvent fails to produce any measurable splitting of the NO3− ν3(E′) or ν4(E′) modes.