Abstract
Infrared study was made on aniline adsorbed on aluminum chloride, bromide and iodide. Aniline-d0 (C6H5NH2), aniline-N,N-d2, aniline-d5 (C6D5NH2) and aniline-d7 were used. Aniline-d0–gallium chloride system was studied for comparison. Only the bands associated with amino group showed large frequency shifts on complex formation. The structures of adsorbed molecules were discussed in terms of the frequency shift of bands, especially of those assigned to C–N stretching and ND2 bending modes. The interaction of adsorbed aniline with aluminum chloride is rather weak and predominantly ionic. A strong chemisorption with the formation of an essentially covalent N···Al bond can be deduced for aniline adsorbed on aluminum bromide, iodide and gallium chloride. Such an ionic adsorption on aluminum chloride can be understood by considering the ionic structure of solid aluminum chloride. Some of the observed bands for aniline-d5 are (cm−1); 3424, 3350, 3312 (NH str.), 1620 (NH2 bend.) and 1300 (CN str.).
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