Acta Crystallographica Section C

Crystal Structure Communications

Volume 62, Part 10 (October 2006)

organic compounds

av3034 scheme

Acta Cryst. (2006). C62, o612-o617 [ doi:10.1107/S0108270106033506 ]

Hydrogen-bonding motifs in 4-carboxyphenylammonium nitrate and perchlorate monohydrate, and in bis(4-carboxyphenylammonium) sulfate

S. Athimoolam and S. Natarajan

Abstract: In the title compounds, C₇H₈NO₂⁺·NO₃^-, (I), C₇H₈NO₂⁺·ClO₄^-·H₂O, (II), and 2C₇H₈NO₂⁺·SO₄^2-, (III), the carboxyl planes of the 4-carboxyphenylammonium cations are twisted from the aromatic plane. A homonuclear C(8) hydrogen-bonding motif of 4-carboxyphenylammonium cations is observed in both (I) and (II), leading to `head-to-tail' layers. The cations in (III) form carboxyl group dimers, making a graph-set motif of R₂²(8). In all the structures, anions connect the cationic layers and an infinite chain running along the c axis is observed, having the C₂²(6) graph-set motif. Interestingly, in (II), the anions are connected through weak hydrogen bonds involving the water molecules, leading to a graph-set motif of R₄⁴(12). Alternate hydrophobic and hydrophilic layers are observed in all three compounds as a result of the column-like arrangement of the aromatic rings of the cations and the anions. Furthermore, in (I), head-to-tail N-HO interactions and interactions linking the cations and anions form an R₆⁴(16) hydrogen-bonding motif, resulting in a pseudo-inversion centre at ( $1\over2$ , $1\over2$ , 0).

Formula: C₇H₈NO₂⁺·NO₃^-, C₇H₈NO₂⁺·ClO₄^-·H₂O and 2C₇H₈NO₂⁺·SO₄^2-


	Structure factor file (CIF format) (76.4 kbytes) [ doi:10.1107/S0108270106033506/av3034Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (88.4 kbytes) [ doi:10.1107/S0108270106033506/av3034IIsup3.hkl ] Contains datablock II

	Structure factor file (CIF format) (132.9 kbytes) [ doi:10.1107/S0108270106033506/av3034IIIsup4.hkl ] Contains datablock III

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