Naslov
Hydrogen bonding in the bromide salts of 4-aminobenzoic acid and 4-aminoacetophenone

Autori
Cinčić, Dominik ; Kaitner, Branko

Izvornik
Acta Crystallographica - Section C - Crystal Structure Communications (0108-2701) 64 (2008), Part 4; O226-o229

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
bromide salts; 4-aminobenzoic acid; 4-aminoacetophenone; hydrogen bonding; crystal structure

Sažetak
In the title compounds, 4-carboxyanilinium bromide, C_7H_8NO_2^+ Br^_, (I), and 4-acetylanilinium bromide, C_8H_10NO^+ Br^_, (II), each asymmetric unit contains a discrete cation with a protonated amino group and a halide anion. Both crystal structures are characterized by two-dimensional hydrogen-bonded networks. The ions in (I) are connected via N— H… Br, N— H… O and O— H… Br hydrogen bonds, with three characteristic graph-set motifs, viz. C(8), C21(4) and R32(8). The centrosymmetric hydrogen-bonded R22(8) dimmer motif characteristic of carboxylic acids is absent. The ions in (II) are connected via N— H… Br and N— H… O hydrogen bonds, with two characteristic graph-set motifs, viz. C(8) and R42(8). The significance of this study lies in its illustration of the differences between the supramolecular aggregations in two similar compounds. The presence of the methyl group in (II) at the site corresponding to the hydroxyl group in (I) results in a significantly different hydrogen-bonding arrangement.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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