organic compounds
3-(1H-Indol-3-yl)-2-(2-nitrobenzenesulfonamido)propanoic acid including an unknown solvate
aMaterials Chemistry laboratory, Department of Chemistry, GC University, Lahore 54000, Pakistan, and bDepartment of Chemistry, University of Aberdeen, Aberdeen AB24 3UE, Scotland
*Correspondence e-mail: iuklodhi@yahoo.com
In the title compound, C17H15N3O6S, which crystallized with highly disordered methanol and/or water solvent molecules, the dihedral angle between the the indole and benzene ring systems is 5.3 (2)°, which allows for the formation of intramolecular π–π stacking interactions [centroid–centroid separations = 3.641 (3) and 3.694 (3) Å] and an approximate overall U-shape for the molecule. In the crystal, dimers linked by pairs of Ns—H⋯Oc (s = sulfonamide and c = carboxylate) hydrogen bonds generate R22(10) loops, whereas Ni—H⋯π (i = indole) interactions lead to chains propagating in [100] or [010]. Together, these lead to a three-dimensional network in which the solvent voids are present as intersecting (two-dimensional) systems of [100] and [010] channels. The title compound was found to contain a heavily disordered solvent molecule, which could be methanol or water or a mixture of the two. Due to its uncertain nature and the unresolvable disorder, the data were processed with the SQUEEZE option in PLATON [Spek (2009). Acta Cryst. D65, 148–155], which revealed 877.8 Å3 of solvent-accessible volume per and 126 electron-units of scattering density or 109.7 Å3 (16 electron units) per organic molecule.. This was not included in the calculations of overall formula weight, density and absorption coefficient.
Related literature
For related structures and background references to the biological activity of et al. (2011a,b). For further synthetic details, see: Deng & Mani (2006).
see: KhanExperimental
Crystal data
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Data collection
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Data collection: APEX2 (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536812023446/sj5218sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812023446/sj5218Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536812023446/sj5218Isup3.cml
The title compound was prepared following the literature method (Deng & Mani, 2006) and recrystalized from methanol by slow evaporation to yield yellow blocks of (I).
Due to the disordered solvent molecule and its uncertain identity, the data were processed with SQUEEZE in PLATON (Spek, 2009). This revealed 877.8 Å3 of solvent accessible volume per ≤ h ≤ 11, -11 ≤ k ≤ 11, -54 ≤ l ≤ 54), for which Rint was 0.068.
and 126 electron-units of scattering density or 109.7 Å3 (16 electron units) per organic molecule. This was not included in the calculations of overall formula weight, density and The original data set consisted of 31099 measured reflections (-11The C- and N-bound H-atoms were geometrically placed (C—H = 0.93–0.98 Å, N—H = 0.86 Å) and refined as riding with Uiso(H) = 1.2Ueq(carrier). The O-bound H was located in a difference map and refined as riding in its as-found relative position with Uiso(H) = 1.5Ueq(O).
As part of our ongoing studies of chiral
with possible biological activity (Khan et al., 2011a,b), we now report the structure of the title compound, (I). Compound (I) was found to contain a heavily disordered solvent molecule, which could be methanol or water or a mixture of the two. Due to its uncertain nature and the unresolvable disorder, the data were processed with the SQUEEZE option in PLATON (Spek, 2009), to remove the solvent contribution to the scattering.The molecular structure of (I) (Fig. 1) approximates to a U-shape, with the indole ring system (C1—C8/N1; r.m.s. deviation = 0.007 Å) and benzene ring (C12–C17) lying approximately parallel to each other [dihedral angle = 5.3 (2)°]. This allows intramolecular aromatic π-π stacking to occur: the separations of the centroid of the C12–C17 benzene ring with those of the C1–C6 and C1/C6/C7/C8/N1 rings are 3.641 (3) Å and 3.694 (3) Å, respectively. The N3/O5/O6 nitro group is twisted out of the plane of its atttached ring by 48.9 (4)°. The configuration of the stereogenic carbon atom (C10) in (I) is S, which is consistent with that of the equivalent atom in the starting material.
In the crystal, the molecules are linked into dimers via pairs of Ns–H···Oc (s = sulfonamide, c = carboxylate) hydrogen bonds (Fig. 2, Table 1), which result in R22(10) loops. A crystallographic twofold axis directed along [110] generates the second molecule from the asymmetric molecule. In addition, weak Ni—H···π (i = indole) interactions occur: these lead to [100] chains for the asymmetric molecule and [010] chains for symmetry-generated molecules in other locations in the unit-cell (Fig. 3). The carboxylic acid O—H group is directed towards the solvent void and probably forms a hydrogen bond to the solvent.
Together, the N–H···O and N–H···π bonds generate a three-dimensional network of molecules within the distinctive "tall" tetragonal unit-cell (Fig. 3). The solvent voids are apparent as square grids of intersecting [100] and [010] pseudo channels lying at z = 0, z = 1/4 and symmetry equivalent locations.
The molcular conformation and π-π stacking can occur. In the crystal of (II), in which the solvent water molecule was located, Ns–H···Os hydrogen bonds and Oc–H···Ow (s = sulfonamide, c = carboxylic acid, w = water) hydrogen bonds generate chains and the crystal symmetry is monoclinic. Another feature of (II) not seen in (I) is the presence of a short intermolecular C—H···O interaction arising from the α (chiral) C atom (Khan et al., 2011b). However, it is interesting to note that (I) and (II) both feature an unusual Ni–H···π (i = indole) interaction.
(Khan et al., 2011a) of the closely related compound 3-(1H-indol-3-yl)-2-(toluene-4-sulfonylamino)-propionic acid monohydrate, (II), are completely different to (I). In (II), where a para-toluene substituent has replaced the 2-nitrobebzene substituent in (I), the organic molecule adopts an extended Z-shaped conformation and no intramolecularFor related structures and background references to the biological activity of
see: Khan et al. (2011a,b). For further synthetic details, see: Deng & Mani (2006).Data collection: APEX2 (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).C17H15N3O6S | Dx = 1.254 Mg m−3 |
Mr = 389.38 | Mo Kα radiation, λ = 0.71073 Å |
Tetragonal, P41212 | Cell parameters from 9980 reflections |
Hall symbol: P 4abw 2nw | θ = 2.8–26.9° |
a = 9.6818 (5) Å | µ = 0.19 mm−1 |
c = 44.017 (3) Å | T = 296 K |
V = 4126.0 (4) Å3 | Block, yellow |
Z = 8 | 0.30 × 0.25 × 0.10 mm |
F(000) = 1616 |
Bruker Kappa APEXII CCD diffractometer | 3492 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.000 |
Graphite monochromator | θmax = 26.0°, θmin = 2.5° |
ω scans | h = −7→8 |
4042 measured reflections | k = 0→11 |
4042 independent reflections | l = 0→54 |
Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
Least-squares matrix: full | H-atom parameters constrained |
R[F2 > 2σ(F2)] = 0.067 | w = 1/[σ2(Fo2) + (0.0679P)2 + 3.5726P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.168 | (Δ/σ)max < 0.001 |
S = 1.07 | Δρmax = 0.21 e Å−3 |
4042 reflections | Δρmin = −0.24 e Å−3 |
245 parameters | Extinction correction: SHELXL, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
0 restraints | Extinction coefficient: 0.0083 (12) |
Primary atom site location: structure-invariant direct methods | Absolute structure: Flack (1983), 1581 Friedel pairs |
Secondary atom site location: difference Fourier map | Absolute structure parameter: 0.03 (15) |
C17H15N3O6S | Z = 8 |
Mr = 389.38 | Mo Kα radiation |
Tetragonal, P41212 | µ = 0.19 mm−1 |
a = 9.6818 (5) Å | T = 296 K |
c = 44.017 (3) Å | 0.30 × 0.25 × 0.10 mm |
V = 4126.0 (4) Å3 |
Bruker Kappa APEXII CCD diffractometer | 3492 reflections with I > 2σ(I) |
4042 measured reflections | Rint = 0.000 |
4042 independent reflections |
R[F2 > 2σ(F2)] = 0.067 | H-atom parameters constrained |
wR(F2) = 0.168 | Δρmax = 0.21 e Å−3 |
S = 1.07 | Δρmin = −0.24 e Å−3 |
4042 reflections | Absolute structure: Flack (1983), 1581 Friedel pairs |
245 parameters | Absolute structure parameter: 0.03 (15) |
0 restraints |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.5558 (4) | 0.6025 (4) | 0.39025 (8) | 0.0488 (8) | |
C2 | 0.6443 (5) | 0.5208 (5) | 0.37363 (10) | 0.0583 (10) | |
H2A | 0.7108 | 0.4675 | 0.3834 | 0.070* | |
C3 | 0.6335 (6) | 0.5186 (6) | 0.34215 (11) | 0.0780 (15) | |
H3A | 0.6925 | 0.4627 | 0.3309 | 0.094* | |
C4 | 0.5350 (7) | 0.5994 (6) | 0.32731 (10) | 0.0792 (15) | |
H4 | 0.5306 | 0.5977 | 0.3062 | 0.095* | |
C5 | 0.4460 (6) | 0.6799 (6) | 0.34293 (11) | 0.0763 (14) | |
H5 | 0.3799 | 0.7328 | 0.3329 | 0.092* | |
C6 | 0.4564 (5) | 0.6813 (4) | 0.37487 (9) | 0.0558 (10) | |
C7 | 0.4312 (5) | 0.7179 (5) | 0.42414 (10) | 0.0641 (11) | |
H7 | 0.3953 | 0.7511 | 0.4423 | 0.077* | |
C8 | 0.5374 (4) | 0.6301 (4) | 0.42204 (8) | 0.0505 (9) | |
C9 | 0.6174 (4) | 0.5663 (4) | 0.44725 (9) | 0.0554 (10) | |
H9A | 0.6013 | 0.6180 | 0.4658 | 0.067* | |
H9B | 0.7152 | 0.5717 | 0.4426 | 0.067* | |
C10 | 0.5775 (4) | 0.4149 (4) | 0.45240 (8) | 0.0500 (9) | |
H10 | 0.5916 | 0.3639 | 0.4334 | 0.060* | |
C11 | 0.6702 (4) | 0.3540 (4) | 0.47649 (8) | 0.0481 (9) | |
C12 | 0.2877 (4) | 0.3494 (4) | 0.40872 (8) | 0.0467 (8) | |
C13 | 0.3606 (5) | 0.2926 (5) | 0.38483 (9) | 0.0612 (11) | |
H13 | 0.4322 | 0.2310 | 0.3887 | 0.073* | |
C14 | 0.3275 (6) | 0.3271 (6) | 0.35519 (9) | 0.0734 (14) | |
H14 | 0.3782 | 0.2905 | 0.3391 | 0.088* | |
C15 | 0.2204 (7) | 0.4150 (6) | 0.34959 (10) | 0.0777 (14) | |
H15 | 0.1990 | 0.4378 | 0.3296 | 0.093* | |
C16 | 0.1439 (5) | 0.4701 (6) | 0.37262 (11) | 0.0718 (13) | |
H16 | 0.0696 | 0.5281 | 0.3686 | 0.086* | |
C17 | 0.1800 (4) | 0.4373 (4) | 0.40226 (9) | 0.0552 (10) | |
S1 | 0.33465 (11) | 0.29054 (11) | 0.44601 (2) | 0.0528 (3) | |
N1 | 0.3822 (4) | 0.7526 (4) | 0.39580 (9) | 0.0713 (11) | |
H1 | 0.3162 | 0.8094 | 0.3920 | 0.086* | |
N2 | 0.4319 (3) | 0.4032 (3) | 0.46119 (6) | 0.0484 (7) | |
H2 | 0.3988 | 0.4579 | 0.4747 | 0.058* | |
N3 | 0.0981 (4) | 0.5018 (4) | 0.42620 (10) | 0.0664 (10) | |
O1 | 0.6449 (3) | 0.3541 (4) | 0.50311 (6) | 0.0781 (10) | |
O2 | 0.7836 (3) | 0.3064 (4) | 0.46516 (6) | 0.0853 (12) | |
H3 | 0.8481 | 0.2766 | 0.4797 | 0.102* | |
O3 | 0.4148 (3) | 0.1700 (3) | 0.44107 (7) | 0.0718 (9) | |
O4 | 0.2103 (3) | 0.2828 (4) | 0.46327 (7) | 0.0755 (10) | |
O5 | 0.1554 (4) | 0.5580 (5) | 0.44684 (9) | 0.0921 (12) | |
O6 | −0.0272 (4) | 0.4964 (5) | 0.42333 (11) | 0.0987 (13) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.055 (2) | 0.044 (2) | 0.0473 (18) | −0.0035 (17) | 0.0050 (17) | 0.0033 (16) |
C2 | 0.059 (3) | 0.053 (2) | 0.062 (2) | −0.005 (2) | 0.006 (2) | −0.0003 (19) |
C3 | 0.096 (4) | 0.071 (3) | 0.068 (3) | −0.006 (3) | 0.028 (3) | −0.012 (2) |
C4 | 0.112 (5) | 0.075 (3) | 0.050 (2) | −0.024 (3) | −0.001 (3) | 0.007 (2) |
C5 | 0.087 (4) | 0.078 (3) | 0.064 (3) | −0.005 (3) | −0.012 (3) | 0.021 (3) |
C6 | 0.062 (3) | 0.049 (2) | 0.057 (2) | −0.004 (2) | −0.0034 (18) | 0.0095 (18) |
C7 | 0.068 (3) | 0.068 (3) | 0.056 (2) | 0.005 (2) | 0.011 (2) | 0.004 (2) |
C8 | 0.057 (2) | 0.044 (2) | 0.0509 (19) | −0.0017 (17) | 0.0004 (17) | 0.0059 (16) |
C9 | 0.057 (2) | 0.056 (2) | 0.053 (2) | −0.0113 (18) | −0.0096 (18) | 0.0039 (18) |
C10 | 0.054 (2) | 0.062 (2) | 0.0342 (15) | 0.0002 (19) | −0.0001 (15) | −0.0023 (15) |
C11 | 0.049 (2) | 0.055 (2) | 0.0394 (16) | 0.0018 (17) | 0.0053 (15) | 0.0022 (15) |
C12 | 0.046 (2) | 0.049 (2) | 0.0459 (17) | −0.0078 (17) | −0.0033 (16) | −0.0022 (15) |
C13 | 0.060 (3) | 0.066 (3) | 0.057 (2) | −0.007 (2) | 0.0011 (19) | −0.013 (2) |
C14 | 0.085 (3) | 0.086 (3) | 0.050 (2) | −0.031 (3) | 0.006 (2) | −0.010 (2) |
C15 | 0.099 (4) | 0.082 (4) | 0.051 (2) | −0.028 (3) | −0.015 (3) | 0.004 (2) |
C16 | 0.058 (3) | 0.081 (3) | 0.077 (3) | −0.007 (2) | −0.019 (2) | 0.013 (2) |
C17 | 0.044 (2) | 0.060 (2) | 0.062 (2) | −0.0064 (19) | −0.0104 (18) | 0.0037 (19) |
S1 | 0.0515 (6) | 0.0560 (6) | 0.0508 (5) | −0.0032 (5) | −0.0041 (4) | 0.0055 (4) |
N1 | 0.070 (3) | 0.064 (2) | 0.080 (2) | 0.0302 (19) | 0.002 (2) | 0.0077 (19) |
N2 | 0.0449 (17) | 0.060 (2) | 0.0401 (14) | 0.0036 (15) | 0.0014 (13) | −0.0026 (14) |
N3 | 0.050 (2) | 0.069 (3) | 0.081 (2) | 0.0070 (18) | 0.0047 (19) | 0.014 (2) |
O1 | 0.068 (2) | 0.128 (3) | 0.0381 (13) | 0.030 (2) | 0.0032 (13) | 0.0059 (16) |
O2 | 0.0609 (19) | 0.147 (4) | 0.0478 (14) | 0.039 (2) | 0.0108 (14) | 0.0140 (19) |
O3 | 0.076 (2) | 0.0584 (18) | 0.081 (2) | 0.0064 (17) | −0.0180 (17) | −0.0001 (16) |
O4 | 0.0590 (18) | 0.102 (3) | 0.0655 (17) | −0.0225 (18) | 0.0054 (15) | 0.0188 (18) |
O5 | 0.075 (2) | 0.118 (3) | 0.082 (2) | 0.013 (2) | 0.010 (2) | −0.031 (2) |
O6 | 0.046 (2) | 0.115 (3) | 0.135 (3) | 0.010 (2) | 0.000 (2) | 0.015 (3) |
C1—C2 | 1.377 (6) | C11—O1 | 1.197 (4) |
C1—C6 | 1.402 (6) | C11—O2 | 1.291 (5) |
C1—C8 | 1.436 (5) | C12—C17 | 1.375 (5) |
C2—C3 | 1.390 (7) | C12—C13 | 1.381 (6) |
C2—H2A | 0.9300 | C12—S1 | 1.796 (4) |
C3—C4 | 1.396 (8) | C13—C14 | 1.384 (6) |
C3—H3A | 0.9300 | C13—H13 | 0.9300 |
C4—C5 | 1.350 (8) | C14—C15 | 1.363 (8) |
C4—H4 | 0.9300 | C14—H14 | 0.9300 |
C5—C6 | 1.410 (6) | C15—C16 | 1.364 (8) |
C5—H5 | 0.9300 | C15—H15 | 0.9300 |
C6—N1 | 1.356 (6) | C16—C17 | 1.387 (6) |
C7—C8 | 1.337 (6) | C16—H16 | 0.9300 |
C7—N1 | 1.376 (6) | C17—N3 | 1.459 (6) |
C7—H7 | 0.9300 | S1—O3 | 1.418 (3) |
C8—C9 | 1.488 (5) | S1—O4 | 1.426 (3) |
C9—C10 | 1.533 (6) | S1—N2 | 1.588 (3) |
C9—H9A | 0.9700 | N1—H1 | 0.8600 |
C9—H9B | 0.9700 | N2—H2 | 0.8600 |
C10—N2 | 1.466 (5) | N3—O5 | 1.195 (5) |
C10—C11 | 1.509 (5) | N3—O6 | 1.221 (5) |
C10—H10 | 0.9800 | O2—H3 | 0.9400 |
C2—C1—C6 | 118.9 (4) | O1—C11—C10 | 124.5 (4) |
C2—C1—C8 | 134.6 (4) | O2—C11—C10 | 111.9 (3) |
C6—C1—C8 | 106.5 (4) | C17—C12—C13 | 118.5 (4) |
C1—C2—C3 | 119.5 (5) | C17—C12—S1 | 125.2 (3) |
C1—C2—H2A | 120.3 | C13—C12—S1 | 116.1 (3) |
C3—C2—H2A | 120.3 | C12—C13—C14 | 120.2 (5) |
C2—C3—C4 | 120.6 (5) | C12—C13—H13 | 119.9 |
C2—C3—H3A | 119.7 | C14—C13—H13 | 119.9 |
C4—C3—H3A | 119.7 | C15—C14—C13 | 119.8 (5) |
C5—C4—C3 | 121.5 (4) | C15—C14—H14 | 120.1 |
C5—C4—H4 | 119.3 | C13—C14—H14 | 120.1 |
C3—C4—H4 | 119.3 | C14—C15—C16 | 121.5 (4) |
C4—C5—C6 | 117.9 (5) | C14—C15—H15 | 119.2 |
C4—C5—H5 | 121.1 | C16—C15—H15 | 119.2 |
C6—C5—H5 | 121.1 | C15—C16—C17 | 118.2 (5) |
N1—C6—C1 | 108.2 (3) | C15—C16—H16 | 120.9 |
N1—C6—C5 | 130.1 (4) | C17—C16—H16 | 120.9 |
C1—C6—C5 | 121.7 (4) | C12—C17—C16 | 121.8 (4) |
C8—C7—N1 | 110.9 (4) | C12—C17—N3 | 121.8 (4) |
C8—C7—H7 | 124.5 | C16—C17—N3 | 116.4 (4) |
N1—C7—H7 | 124.5 | O3—S1—O4 | 120.0 (2) |
C7—C8—C1 | 106.3 (4) | O3—S1—N2 | 107.77 (18) |
C7—C8—C9 | 127.8 (4) | O4—S1—N2 | 108.22 (19) |
C1—C8—C9 | 125.8 (4) | O3—S1—C12 | 105.04 (19) |
C8—C9—C10 | 112.1 (3) | O4—S1—C12 | 106.84 (19) |
C8—C9—H9A | 109.2 | N2—S1—C12 | 108.47 (17) |
C10—C9—H9A | 109.2 | C6—N1—C7 | 108.0 (4) |
C8—C9—H9B | 109.2 | C6—N1—H1 | 126.0 |
C10—C9—H9B | 109.2 | C7—N1—H1 | 126.0 |
H9A—C9—H9B | 107.9 | C10—N2—S1 | 120.8 (3) |
N2—C10—C11 | 110.9 (3) | C10—N2—H2 | 119.6 |
N2—C10—C9 | 110.8 (3) | S1—N2—H2 | 119.6 |
C11—C10—C9 | 109.1 (3) | O5—N3—O6 | 124.0 (5) |
N2—C10—H10 | 108.7 | O5—N3—C17 | 119.4 (4) |
C11—C10—H10 | 108.7 | O6—N3—C17 | 116.6 (5) |
C9—C10—H10 | 108.7 | C11—O2—H3 | 114.3 |
O1—C11—O2 | 123.5 (4) | ||
C6—C1—C2—C3 | 0.2 (6) | C12—C13—C14—C15 | −1.5 (7) |
C8—C1—C2—C3 | −179.9 (5) | C13—C14—C15—C16 | −0.2 (8) |
C1—C2—C3—C4 | 0.7 (7) | C14—C15—C16—C17 | 1.6 (8) |
C2—C3—C4—C5 | −1.2 (8) | C13—C12—C17—C16 | −0.2 (6) |
C3—C4—C5—C6 | 0.7 (8) | S1—C12—C17—C16 | −175.2 (4) |
C2—C1—C6—N1 | −179.9 (4) | C13—C12—C17—N3 | −179.9 (4) |
C8—C1—C6—N1 | 0.1 (5) | S1—C12—C17—N3 | 5.2 (6) |
C2—C1—C6—C5 | −0.7 (6) | C15—C16—C17—C12 | −1.4 (7) |
C8—C1—C6—C5 | 179.4 (4) | C15—C16—C17—N3 | 178.2 (4) |
C4—C5—C6—N1 | 179.3 (5) | C17—C12—S1—O3 | 160.3 (4) |
C4—C5—C6—C1 | 0.2 (7) | C13—C12—S1—O3 | −14.8 (4) |
N1—C7—C8—C1 | −1.9 (5) | C17—C12—S1—O4 | 31.7 (4) |
N1—C7—C8—C9 | −178.9 (4) | C13—C12—S1—O4 | −143.3 (3) |
C2—C1—C8—C7 | −178.9 (5) | C17—C12—S1—N2 | −84.7 (4) |
C6—C1—C8—C7 | 1.1 (5) | C13—C12—S1—N2 | 100.2 (3) |
C2—C1—C8—C9 | −1.7 (7) | C1—C6—N1—C7 | −1.2 (5) |
C6—C1—C8—C9 | 178.2 (4) | C5—C6—N1—C7 | 179.6 (5) |
C7—C8—C9—C10 | 103.7 (5) | C8—C7—N1—C6 | 2.0 (6) |
C1—C8—C9—C10 | −72.8 (5) | C11—C10—N2—S1 | −104.3 (3) |
C8—C9—C10—N2 | −62.1 (4) | C9—C10—N2—S1 | 134.4 (3) |
C8—C9—C10—C11 | 175.6 (3) | O3—S1—N2—C10 | 36.3 (3) |
N2—C10—C11—O1 | −31.5 (6) | O4—S1—N2—C10 | 167.5 (3) |
C9—C10—C11—O1 | 90.8 (5) | C12—S1—N2—C10 | −76.9 (3) |
N2—C10—C11—O2 | 151.1 (4) | C12—C17—N3—O5 | 48.9 (6) |
C9—C10—C11—O2 | −86.6 (4) | C16—C17—N3—O5 | −130.7 (5) |
C17—C12—C13—C14 | 1.7 (6) | C12—C17—N3—O6 | −132.4 (5) |
S1—C12—C13—C14 | 177.1 (3) | C16—C17—N3—O6 | 48.0 (6) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···Cg1i | 0.86 | 2.77 | 3.565 (4) | 155 |
N2—H2···O1ii | 0.86 | 2.10 | 2.918 (4) | 158 |
Symmetry codes: (i) x−1/2, −y+3/2, −z+3/4; (ii) y, x, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C17H15N3O6S |
Mr | 389.38 |
Crystal system, space group | Tetragonal, P41212 |
Temperature (K) | 296 |
a, c (Å) | 9.6818 (5), 44.017 (3) |
V (Å3) | 4126.0 (4) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.19 |
Crystal size (mm) | 0.30 × 0.25 × 0.10 |
Data collection | |
Diffractometer | Bruker Kappa APEXII CCD |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4042, 4042, 3492 |
Rint | 0.000 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.067, 0.168, 1.07 |
No. of reflections | 4042 |
No. of parameters | 245 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.21, −0.24 |
Absolute structure | Flack (1983), 1581 Friedel pairs |
Absolute structure parameter | 0.03 (15) |
Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997), SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···Cg1i | 0.86 | 2.77 | 3.565 (4) | 155 |
N2—H2···O1ii | 0.86 | 2.10 | 2.918 (4) | 158 |
Symmetry codes: (i) x−1/2, −y+3/2, −z+3/4; (ii) y, x, −z+1. |
Acknowledgements
The authors acknowledge the Higher Education Commission of Pakistan for providing a grant for the project to strengthen the Materials Chemistry Laboratory at GC University Lahore, Pakistan.
References
Bruker (2007). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Deng, X. & Mani, N. S. (2006). Green Chem. 8, 835–838. Web of Science CrossRef CAS Google Scholar
Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565. CrossRef IUCr Journals Google Scholar
Flack, H. D. (1983). Acta Cryst. A39, 876–881. CrossRef CAS Web of Science IUCr Journals Google Scholar
Khan, I. U., Arshad, M. N., Mubashar-ur-Rehman, H., Harrison, W. T. A. & Ali, M. B. (2011a). Acta Cryst. E67, o2325. Web of Science CSD CrossRef IUCr Journals Google Scholar
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
As part of our ongoing studies of chiral sulfonamides with possible biological activity (Khan et al., 2011a,b), we now report the structure of the title compound, (I). Compound (I) was found to contain a heavily disordered solvent molecule, which could be methanol or water or a mixture of the two. Due to its uncertain nature and the unresolvable disorder, the data were processed with the SQUEEZE option in PLATON (Spek, 2009), to remove the solvent contribution to the scattering.
The molecular structure of (I) (Fig. 1) approximates to a U-shape, with the indole ring system (C1—C8/N1; r.m.s. deviation = 0.007 Å) and benzene ring (C12–C17) lying approximately parallel to each other [dihedral angle = 5.3 (2)°]. This allows intramolecular aromatic π-π stacking to occur: the separations of the centroid of the C12–C17 benzene ring with those of the C1–C6 and C1/C6/C7/C8/N1 rings are 3.641 (3) Å and 3.694 (3) Å, respectively. The N3/O5/O6 nitro group is twisted out of the plane of its atttached ring by 48.9 (4)°. The configuration of the stereogenic carbon atom (C10) in (I) is S, which is consistent with that of the equivalent atom in the starting material.
In the crystal, the molecules are linked into dimers via pairs of Ns–H···Oc (s = sulfonamide, c = carboxylate) hydrogen bonds (Fig. 2, Table 1), which result in R22(10) loops. A crystallographic twofold axis directed along [110] generates the second molecule from the asymmetric molecule. In addition, weak Ni—H···π (i = indole) interactions occur: these lead to [100] chains for the asymmetric molecule and [010] chains for symmetry-generated molecules in other locations in the unit-cell (Fig. 3). The carboxylic acid O—H group is directed towards the solvent void and probably forms a hydrogen bond to the solvent.
Together, the N–H···O and N–H···π bonds generate a three-dimensional network of molecules within the distinctive "tall" tetragonal unit-cell (Fig. 3). The solvent voids are apparent as square grids of intersecting [100] and [010] pseudo channels lying at z = 0, z = 1/4 and symmetry equivalent locations.
The molcular conformation and crystal structure (Khan et al., 2011a) of the closely related compound 3-(1H-indol-3-yl)-2-(toluene-4-sulfonylamino)-propionic acid monohydrate, (II), are completely different to (I). In (II), where a para-toluene substituent has replaced the 2-nitrobebzene substituent in (I), the organic molecule adopts an extended Z-shaped conformation and no intramolecular π-π stacking can occur. In the crystal of (II), in which the solvent water molecule was located, Ns–H···Os hydrogen bonds and Oc–H···Ow (s = sulfonamide, c = carboxylic acid, w = water) hydrogen bonds generate chains and the crystal symmetry is monoclinic. Another feature of (II) not seen in (I) is the presence of a short intermolecular C—H···O interaction arising from the α (chiral) C atom (Khan et al., 2011b). However, it is interesting to note that (I) and (II) both feature an unusual Ni–H···π (i = indole) interaction.