Structures of (aniline-benzene)+ and (aniline)2+ are re-investigated by electronic spectroscopy in the near-infrared region and vibrational spectroscopy in the NH stretching region. The spectra of (aniline-benzene)+ indicate a structure including a hydrogen bond between an NH bond of the ionic aniline and the π-electrons of the neutral benzene. Two isomers are suggested for (aniline)2+ in which an NH bond of the ionic aniline forms different types of hydrogen bond with the neutral aniline: one with the π-electrons of the aromatic ring and the other with the lone pair of the nitrogen atom.
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