The FT-infrared and FT-Raman spectra of creatininium salicylate crystal have been recorded and analysed at room temperature. The vibrational assignments of the observed wavenumbers are proposed on the basis of group theoretical analysis. The FT-IR and FT-Raman spectra are reported in the 4000–400 cm-1 region. There is extensive intermolecular hydrogen bonding in the crystal and this is responsible for the changes in the position and intensity of several bands. Vibrational assignments are given for all the observed bands. A pronounced change was observed in the N–H stretching frequencies of the NH2 group. It is proposed that the amide NH2 group influence by the intermolecular hydrogen bond in the complexes. The hydrogen bonding effect on the creatininium modes are analysed.
