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The Raman, infrared, and n.m.r. spectra of solutions of silver nitrate in acetonitrile (up to 9.0 M AgN03) are reported and compared with the spectra of the pure components (silver nitrate as the fused salt). The spectral data indicate that strong solute-solvent interactions take place in these solutions; it is suggested that a complex ion of formula Ag-(CH&N)z+ is present. In all solutions a clear splitting of the degenerate stretching vibration of the nitrate ion is observed. This splitting is also found for the molten silver nitrate and indicates the existence of strong ion-ion interactiom.