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Ammonium p-methylbenzenesulfonate, C7H11NO3S, Mr = 189.23, orthorhombic, space group Pna21, a = 20.406(4), b = 6.271(1), c = 7.067(2)Å, V = 904.19 Å3, Z = 4, Dx = 1.39, Dm = 1.38g·cm-3, λ(Mo Kα) = 0. 71069 Å, μ = 3.1 cm-1, T = 298K, F(000) = 400, final R = 0.057 for 994 unique observed reflections with I > 16σ(I). The methylbenzene portion including the sulfur atom is nearly planar. Between the SO3 groups and the ammonium ion, there are three unique hydrogen bonds; two of which make the anions linked along the c-axis and the remaining one along the b-axis. These hydrogen bonds make two-dimensionally hydrogen-bonded molecular layers. Among these hydrophilic layers, the methylbenzene moieties cluster together to form hydrophobic layers.
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