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The title compound (systematic name: pyridinium 4-methylbenzenesulfonate), C5H6N+·C7H7O3S−, is the pyridinium salt of para-toluenesulfonic acid. In the crystal, classical N—H...O hydrogen bonds as well as C—H...O contacts connect the cationic and anionic entities into sheets lying parallel to the ab plane.

The title compound (systematic name: rac-2-hydroxy-3-methylbutanoic acid), C5H10O3, is the constitutional isomer of α-hydroxybutanoic acid. In the crystal, hydrogen bonds involving the alcoholic hydroxyl group give rise to centrosymmetric dimers that are extended to sheets perpendicular to the crystallographic c axis.

The title compound, C12H22O2, is a symmetric diol derived from the pinacol coupling of cyclohexanone. The asymmetric unit contains three complete molecules. The cyclohexane moieties adopt chair conformations. Cooperative hydrogen bonding connects the individual molecules to infinite chains propagating along the crystallographic a-axis direction.

C6H4BrNO2, orthorhombic, Pna21 (no. 33), a = 21.3992(17) Å, b = 5.9311(4) Å, c = 5.2923(4) Å, V = 671.70(9) Å3, Z = 4, R gt(F) = 0.0284, wR ref(F 2) = 0.0708, T = 200(2) K.

C8H14O5S, monoclinic, P21 (no. 4), a = 6.3783(4) Å, b = 8.2630(5) Å, c = 10.5891(7) Å, β = 90.877(2)°, V = 558.02(6) Å3, Z = 2, Rgt(F) = 0.0254, wRref(F2) = 0.0715, T = 200 K.

C17H30N2, tetragonal, P4‾$P‾{4}$21m (no. 113), a = 8.6755(3) Å, c = 11.1611(4) Å, V = 840.03(7) Å3, Z = 2, Rgt(F) = 0.0488, wRref(F2) = 0.1417, T = 200 K.

C13H8O3S, monoclinic, C2/c (no. 15), a = 9.7499(3) Å, b = 12.9758(4) Å, c = 8.2681(3) Å, β = 103.784(2)°, V = 1015.90(6) Å3, Z = 4, Rgt(F) = 0.0318, wRref(F2) = 0.0927, T = 200 K.

C6H10Cl2N2O, triclinic, P1‾$‾{1}$ (no. 2), a = 4.8274(4) Å, b = 8.0556(7) Å, c = 12.0648(10) Å, α = 71.237(4)°, β = 78.739(4)°, γ = 72.950(4)°, V = 422.06(6) Å3, Z = 2, Rgt(F) = 0.0225, wRref(F2) = 0.0614, T = 190 K.

C12H9NS, monoclinic, P21/n (no. 14), a = 5.0743(5) Å, b = 14.0545(13) Å, c = 13.3319(17) Å, β = 91.102(5)°, V = 950.61(18) Å3, Z = 4, Rgt(F) = 0.0322, wRref(F2) = 0.0908, T = 200 K.

C8H18ClNO2, monoclinic, P21/c (no. 14), a = 6.8110(5) Å, b = 8.8779(7) Å, c = 17.2774(16) Å, β = 97.582(4)°, V = 1035.59(15) Å3, Z = 4, Rgt(F) = 0.0484, wRref(F2) = 0.0922, T = 200 K.

C6H8N2O6, monoclinic, P21/c (no. 14), a = 7.4709(4) Å, b = 14.2051(9) Å, c = 7.3198(4) Å, β$\beta $ = 97.096(4)°, V = 770.86(8) Å3, Z = 4, Rgt(F) = 0.0346, wRref(F2) = 0.0946, T = 200 K.

C21H18O2, triclinic, P1‾$‾{1}$ (no. 2), a = 9.8213(6) Å, b = 9.9212(6) Å, c = 10.0400(6) Å, α = 65.510(2)°, β = 63.539(2)°, γ = 84.842(2)°, V = 791.59(8) Å3, Z = 2, Rgt(F) = 0.0463, wRref(F2) = 0.1101, T = 200 K.

C7H9N, orthorhombic, Pna21 (no. 33), a = 8.9239(5) Å, b = 5.9550(3) Å, c = 23.1168(11) Å, V = 1228.47(11) Å3, Z = 8, Rgt(F) = 0.0367, wRref(F2) = 0.1019, T = 200 K.

C32H30N8O5, orthorhombic, P212121 (no. 19), a = 9.1258(4) Å, b = 10.6225(5) Å, c = 30.1870(14) Å, V = 2926.3(2) Å3, Z = 4, Rgt(F) = 0.0367, wRref(F2) = 0.0837, T = 200 K.

C4H11Cl2N, monoclinic, I2/a (no. 15), a = 13.2374(12) Å, b = 8.2108(6) Å, c = 14.0114(14) Å, β = 93.294(8)°, V = 1520.4(2) Å3, Z = 8, Rgt(F) = 0.0398, wRref(F2) = 0.1174, T = 200 K.

C14H14F6N2O, orthorhombic, Pbcn (no. 60), a = 17.7552(12) Å, b = 10.7574(9) Å, c = 8.0207(7) Å, V = 1532.0(2) Å3, Z = 4, Rgt(F) = 0.0415, wRref(F2) = 0.1154, T = 200 K.

C9H24N2O7, monoclinic, P21/n (no. 14), a = 11.1646(7) Å, b = 6.3264(4) Å, c = 18.6926(9) Å, β = 97.5994(18)°, V = 1308.69(13) Å3, Z = 4, Rgt(F) = 0.0385, wRref(F2) = 0.1057, T = 200 K.

C6H13Cl2N, orthorhombic, P212121 (no. 19), a = 6.0087(3) Å, b = 10.1176(6) Å, c = 14.3532(7) Å, V = 872.58(8) Å3, Z = 4, Rgt(F) = 0.0304, wRref(F2) = 0.0632, T = 200 K.

C18H28BrNO2, orthorhombic, P212121 (no. 19), a = 7.0417(4) Å, b = 9.1635(5) Å, c = 27.3371(15) Å, V = 1763.97(17) Å3, Z = 4, Rgt(F) = 0.0275, wRref(F2) = 0.0596, T = 200 K.

C12H12Cl4NSb, monoclinic, P21/n (no. 14), a = 5.6693(2) Å, b = 20.2385(7) Å, c = 14.3908(5) Å, β = 100.3830(10)°, V = 1624.14(10) Å3, Z = 4, Rgt(F) = 0.0192, wRref(F2) = 0.0430, T = 200 K.

C6H4Br2FN, monoclinic, P21/c (no. 14), a = 17.0332(5) Å, b = 4.34070(10) Å, c = 21.9732(5) Å, β = 109.6910(10)°, V = 1529.61(7) Å3, Z = 8, Rgt(F) = 0.0256, wRref(F2) = 0.0518, T = 200 K.

C6H15Cl2N, triclinic, P1‾$‾{1}$ (no. 2), a = 6.9579(4) Å, b = 8.1852(5) Å, c = 8.7912(5) Å, α = 66.606(2)°, β = 86.105(3)°, γ = 89.834(2)°, V = 458.30(5) Å3, Z = 2, Rgt(F) = 0.0226, wRref(F2) = 0.0599, T = 200 K.

C15H14O4, monoclinic, C2/c (no. 15), a = 27.1122(8) Å, b = 6.4295(2) Å, c = 14.7495(4) Å, β = 91.7070(10)°, V = 2569.96(13) Å3, Z = 8, Rgt(F) = 0.0387, wRref(F2) = 0.1091, T = 200 K.

C12H10O3Se2, triclinic, P1‾$‾{1}$ (no. 2), a = 9.1794(3) Å, b = 11.5706(5) Å, c = 12.3976(5) Å, α = 85.291(2)°, β = 72.198(2)°, γ = 74.084(2)°, V = 1205.65(8) Å3, Z = 4, Rgt(F) = 0.0275, wRref(F2) = 0.0698, T = 200 K.

C7H6BrNO2, orthorhombic, P212121 (no. 19), a = 4.7019(6) Å, b = 6.4700(9) Å, c = 25.283(4) Å, V = 769.14(19) Å3, Z = 4, Rgt(F) = 0.0294, wRref(F2) = 0.0671, T = 200 K.

C19H14ClNO2, monoclinic, P21/c (no. 14), a = 19.328(4) Å, b = 7.1086(12) Å, c = 11.627(2) Å, β = 99.417(9)°, V = 1576.0(5) Å3, Z = 4, Rgt(F) = 0.0582, wRref(F2) = 0.1615, T = 200 K.

C7H5BrO, monoclinic, P21/c (no. 14), a = 27.3992(18) Å, b = 3.9369(2) Å, c = 12.8006(8) Å, β = 103.504(2) Å, V = 1342.60(14) Å3, Z = 8, Rgt(F) = 0.0469, wRref(F2) = 0.1103, T = 200(2) K.

C5H10N2O, monoclinic, Ia (no. 9), a = 4.7212(4) Å, b = 11.1424(8) Å, c = 12.8211(9) Å, β = 94.349(3)°, V = 672.52(9) Å3, Z = 4, Rgt(F) = 0.0280, wRref(F2) = 0.0821, T = 200 K.

C8H8O2, tetragonal, P43212 (no. 96), a = 10.9521(5) Å, c = 23.3014(17) Å, V = 2795.0(3) Å3, Z = 16, Rgt(F) = 0.0317, wRref(F2) = 0.0883, T = 200 K.

C8H8O3, monoclinic, P21/c (no. 14), a = 6.3037(3) Å, b = 33.102(2) Å, c = 7.0471(4) Å, β = 102.105(3)°, V = 1437.79(14) Å3, Z = 8, Rgt(F) = 0.0433, wRref(F2) = 0.1087, T = 200 K.

C8H11ClN2S, orthorhombic, Pbca (no. 61), a = 11.3126(6) Å, b = 8.3567(4) Å, c = 20.4130(11) Å, V = 1929.76(17) Å3, Z = 8, Rgt(F) = 0.0240, wRref(F2) = 0.0680, T = 200 K.

C6H6ClN, monoclinic, P21/c (no. 14), a = 6.5211(2) Å, b = 10.2467(3) Å, c = 9.1436(3) Å, β = 94.1771(11)°, V = 609.35(3) Å3, Z = 4, Rgt(F) = 0.0260, wRref(F2) = 0.0680, T = 200 K.

C8H9NO2S, triclinic, P1¯$\overline{1}$ (no. 2), a = 6.6909(5) Å, b = 7.9787(6) Å, c = 8.5551(6) Å, α = 80.065(3)°, β = 68.175(3)°, γ = 77.676(4)°, V = 412.01(5) Å3, Z = 2, Rgt(F) = 0.0263, wRref(F2) = 0.0784, T = 200(2) K.

C17H10O, orthorhombic, P212121 (no. 19), a = 5.0604(12) Å, b = 14.672(3) Å, c = 14.846(3) Å, V = 1102.2(4) Å3, Z = 4, Rgt(F) = 0.0432, wRref(F2) = 0.1022, T = 200(2) K.

C14H15AsClNOS, monoclinic, P21 (no. 4), a = 5.2852(2) Å, b = 13.3035(6) Å, c = 10.7522(5) Å, β = 90.130(2) Å, V = 756.00(6) Å3, Z = 2, Rgt(F) = 0.0200, wRref(F2) = 0.0503, T = 200(2) K.

C14H13AsClNO2, triclinic, P1¯$\overline{1}$ (no. 2), a = 7.7180(7) Å, b = 8.2190(7) Å, c = 11.9620(10) Å, α = 87.438(4)°, β = 73.450(4)°, γ = 72.167(4)°, V = 691.66(10) Å3, Z = 2, Rgt(F) = 0.0203, wRref(F2) = 0.0541, T = 200 K.

C19H15N3O2, monoclinic, P21/c (no. 14), a = 18.4336(13) Å, b = 6.0321(4) Å, c = 15.0585(10) Å, β = 112.171(3)°, V = 1550.60(18) Å3, Z = 4, Rgt(F) = 0.0535, wRref(F2) = 0.1298, T = 200 K.

C9H13NO${\text{C}}_{9}{\text{H}}_{13}\text{NO}$, orthorhombic, Pbcn (no. 60), a = 29.554(4) Å, b = 7.4930(11) Å, c = 8.2800(10) Å, V = 1833.6(4) Å3, Z = 8, Rgt${R}_{gt}$(F) = 0.0737, wRref$w{R}_{ref}$(F2${F}^{2}$) = 0.1646, T = 200 K.

C3H5ClO2, monoclinic, P21/c (no. 14), a = 5.2011(4) Å, b = 7.4362(4) Å, c = 24.1175(15) Å, β = 94.594(3)°, V = 929.78(10) Å3, Z = 8, Rgt(F) = 0.0333, wRref(F2) = 0.0795, T = 200 K.

C14H16FeO, orthorhombic, P212121 (no. 19), a = 5.6954(3) Å, b = 10.0307(6) Å, c = 20.4422(14) Å, V = 1167.84(12) Å3, Z = 4, Rgt(F) = 0.0267, wRref(F2) = 0.0559, T = 200 K.

C9H10O3, orthorhombic, Pbca (no. 61), a = 14.2570(6) Å, b = 7.9250(4) Å, c = 29.8796(13) Å, V = 3376.0(3) Å3, Z = 16, Rgt(F) = 0.0404, wRref(F2) = 0.1050, T = 200 K.

C6H6O3S, orthorhombic, Pca21 (no. 29), a = 15.3524(8) Å, b = 5.7180(3) Å, c = 15.3395(9) Å, V = 1346.58(13) Å3, Z = 8, Rgt(F) = 0.0253, wRref (F2) = 0.0663, T = 200(2) K.

C10H18O2, monoclinic, C2/c (no. 15), a = 10.0025(5) Å, b = 18.8285(9) Å, c = 11.2384(6) Å, β = 115.327(2)°, V = 1913.11(17) Å3, Z = 8, Rgt(F) = 0.0596, wRref(F2) = 0.1606, T = 200 K.

C6H10N2, triclinic, P1‾$‾{1}$ (no. 2), a = 7.4423(5) Å, b = 7.9420(5) Å, c = 11.6711(8) Å, α = 96.667(3)°, β = 95.650(3)°, γ = 100.999(3)°, V = 667.42(8) Å3, Z = 4, Rgt(F) = 0.0620, wRref(F2) = 0.1681, T = 200 K.

C45H35LaO7, trigonal, R3 (no. 146), a = 22.3832(11) Å, c = 6.4522(3) Å, V = 2799.5(3) Å3, Z = 3, Rgt(F) = 0.0192, wRref(F2) = 0.0462, T = 200 K.

C13H11NO, orthorhombic, Pca21 (no. 29), a = 23.801(4) Å, b = 6.0510(13) Å, c = 7.2677(14) Å, V = 1046.7(3) Å3, Z = 4, Rgt(F) = 0.0335, wRref (F2) = 0.0896, T = 200 K.

C8H9NO3, monoclinic, P21/n (no. 14), a = 6.9121(4) Å, b = 26.9700(15) Å, c = 8.7204(5) Å, β = 106.152(3)°, V = 1561.48(16) Å3, Z = 8, Rgt(F) = 0.0486, wRref(F2) = 0.1399, T = 200 K.

C7H3Cl3O, monoclinic, P21/c (no. 14), a = 12.0518(15) Å, b = 9.7403(11) Å, c = 6.9562(9) Å, β = 99.047(4)°, V = 806.42(17) Å3, Z = 4, Rgt(F) = 0.0316, wRref(F2) = 0.0793, T = 200 K.

C4H11NO2, monoclinic, P21/n (no. 14), a = 6.0864(4) Å, b = 10.9696(8) Å, c = 8.5928(5) Å, β = 93.360(3)°, V = 572.72(7) Å3, Z = 4, Rgt(F) = 0.0307, wRref(F2) = 0.0891, T = 200 K.

C13H16F3NO, triclinic, P1‾$‾{1}$ (no. 2), a = 4.7889(4) Å, b = 11.7867(10) Å, c = 12.5323(11) Å, α = 100.762(5)°, β = 100.232(4)°, γ = 100.683(4)°, V = 666.19(10) Å3, Z = 2, Rgt(F) = 0.0531, wRref(F2) = 0.1760, T = 200 K.