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The synthesis of p -toluidinium perchlorate (systematic name: 4-methyl-anilinium perchlorate), C 7 H 10 N + ·ClO 4  - , was carried out from an aqueous reaction of perchloric acid with p -toluidine. This compound was characterized by powder XRD, IR and UV-Vis spectroscopy. The structure was further confirmed by a single-crystal X-ray diffraction study. The crystal structure is formed by a succession of two-dimensional mol-ecular layers consisting of perchlorate anions and organic cations parallel to the (100) plane and located at x = 2 n  + ½ ( n ∈ Z ). Each mixed layer is formed by infinite chains {C 7 H 10 N + ·ClO 4  - }  n  parallel to the [010] direction and developing along the c axis, generating R  2  4 (8), R  2  2 (4) and R  4  4 (12) graph-set motifs. The results of a theoretical study using the DFT method at the B3LYP/6-311++G(d,p) level are in good agreement with the experimental data. Hirshfeld surface and fingerprint plots reveal that the structure is dominated by O⋯H/H⋯O (54.2%), H⋯H (26.9%) and C-H ⋯π (14.3%) contacts. The studied crystal was refined as a two-component twin.

Structure cristalline, caractérisation spectroscopique, calcul DFT et analyse de surface Hirshfeld du perchlorate de p-toluidinium