Acta Cryst. (2009). E65, o447 [ doi:10.1107/S1600536809001342 ]
The title compound, C11H8N2O, crystallizes with two crystallographically independent molecules in the asymmetric unit which are approximately perpendicular to each other [79.97 (6)°]. The indole ring system is planar [r.m.s. deviation = 0.010 (1) Å]. The crystal structure is stabilized by intermolecular C-H
N and N-HO interactions.
Indole (5.85 g, 50 mmol) was added to a solution prepared by dissolution of cyanoacetic acid (5.0 g, 50 mmol) in Ac2O (50 ml) at 50 °C. The solution was heated at 85 °C for 5 min. During that period 3-cyanoacetylindole started to crystallize. After 5 more min, the mixture was allowed to cool and the solid was collected, washed with MeOH, and dried.
H atoms were positioned geometrically (N—H = 0.86 Å, and C—H = 0.93–0.97 Å) and allowed to ride on their parent atoms, with Uiso(H) = 1.5Ueq(C) for methyl H, 1.2Ueq(C) for other H atoms.
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); 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, 2003).
![[Figure 1]](./bt2839fig1thm.gif)
| Fig. 1. Perspective view of the molecule showing the thermal ellipsoids are drawn at 50% probability level. The H atoms are shown as small circles of arbitrary radii. |
![[Figure 2]](./bt2839fig2thm.gif)
| Fig. 2. The crystal packing of the molecules viewed down c axis. H atoms not involved in hydrogen bonding have been omitted for clarity. |
| C11H8N2O | Z = 4 |
| Mr = 184.19 | F(000) = 384 |
| Triclinic, P1 | Dx = 1.322 Mg m−3 |
| Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
| a = 7.3439 (2) Å | Cell parameters from 3554 reflections |
| b = 7.3534 (2) Å | θ = 1.1–25.0° |
| c = 18.2475 (5) Å | µ = 0.09 mm−1 |
| α = 83.402 (2)° | T = 293 K |
| β = 78.890 (2)° | Block, colourless |
| γ = 73.501 (1)° | 0.30 × 0.30 × 0.20 mm |
| V = 925.23 (4) Å3 |
| Bruker Kappa APEXII area-detector diffractometer | 3253 independent reflections |
| Radiation source: fine-focus sealed tube | 2717 reflections with I > 2σ(I) |
| graphite | Rint = 0.025 |
| ω and φ scans | θmax = 25.0°, θmin = 1.1° |
| Absorption correction: multi-scan (SADABS; Sheldrick, 2001) | h = −7→8 |
| Tmin = 0.974, Tmax = 0.983 | k = −8→8 |
| 18838 measured reflections | l = −21→21 |
| Refinement on F2 | Primary atom site location: structure-invariant direct methods |
| Least-squares matrix: full | Secondary atom site location: difference Fourier map |
| R[F2 > 2σ(F2)] = 0.037 | Hydrogen site location: inferred from neighbouring sites |
| wR(F2) = 0.100 | H-atom parameters constrained |
| S = 1.06 | w = 1/[σ2(Fo2) + (0.0404P)2 + 0.2437P] where P = (Fo2 + 2Fc2)/3 |
| 3253 reflections | (Δ/σ)max = 0.008 |
| 253 parameters | Δρmax = 0.12 e Å−3 |
| 0 restraints | Δρmin = −0.16 e Å−3 |
| C11H8N2O | γ = 73.501 (1)° |
| Mr = 184.19 | V = 925.23 (4) Å3 |
| Triclinic, P1 | Z = 4 |
| a = 7.3439 (2) Å | Mo Kα radiation |
| b = 7.3534 (2) Å | µ = 0.09 mm−1 |
| c = 18.2475 (5) Å | T = 293 K |
| α = 83.402 (2)° | 0.30 × 0.30 × 0.20 mm |
| β = 78.890 (2)° |
| Bruker Kappa APEXII area-detector diffractometer | 3253 independent reflections |
| Absorption correction: multi-scan (SADABS; Sheldrick, 2001) | 2717 reflections with I > 2σ(I) |
| Tmin = 0.974, Tmax = 0.983 | Rint = 0.025 |
| 18838 measured reflections | θmax = 25.0° |
| R[F2 > 2σ(F2)] = 0.037 | H-atom parameters constrained |
| wR(F2) = 0.100 | Δρmax = 0.12 e Å−3 |
| S = 1.06 | Δρmin = −0.16 e Å−3 |
| 3253 reflections | Absolute structure: ? |
| 253 parameters | Flack parameter: ? |
| 0 restraints | Rogers parameter: ? |
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 | ||
| O1 | 0.13478 (16) | 0.2464 (2) | 1.01403 (7) | 0.0659 (4) | |
| O1' | 0.76317 (17) | 0.33368 (14) | 0.47980 (6) | 0.0543 (3) | |
| N1 | 0.7573 (2) | 0.2397 (2) | 1.00692 (9) | 0.0619 (4) | |
| H1 | 0.8678 | 0.2314 | 1.0183 | 0.074* | |
| N1' | 0.77718 (19) | −0.28849 (17) | 0.48288 (7) | 0.0479 (3) | |
| H1' | 0.7932 | −0.4024 | 0.4709 | 0.057* | |
| C2 | 0.6023 (2) | 0.2202 (2) | 1.05570 (11) | 0.0567 (4) | |
| H2 | 0.5977 | 0.1956 | 1.1071 | 0.068* | |
| C2' | 0.8188 (2) | −0.1468 (2) | 0.43593 (9) | 0.0441 (4) | |
| H2' | 0.8689 | −0.1567 | 0.3853 | 0.053* | |
| C3 | 0.4501 (2) | 0.2418 (2) | 1.01850 (9) | 0.0475 (4) | |
| C3' | 0.7768 (2) | 0.01550 (19) | 0.47349 (8) | 0.0385 (3) | |
| C4 | 0.5195 (2) | 0.2786 (2) | 0.94094 (9) | 0.0478 (4) | |
| C4' | 0.7012 (2) | −0.03211 (19) | 0.54959 (8) | 0.0389 (3) | |
| C5' | 0.6267 (2) | 0.0675 (2) | 0.61400 (9) | 0.0479 (4) | |
| H5' | 0.6214 | 0.1956 | 0.6133 | 0.058* | |
| C5 | 0.4391 (2) | 0.3141 (2) | 0.87583 (10) | 0.0565 (4) | |
| H5 | 0.3107 | 0.3175 | 0.8777 | 0.068* | |
| C6' | 0.5613 (3) | −0.0269 (2) | 0.67853 (9) | 0.0569 (4) | |
| H6' | 0.5098 | 0.0389 | 0.7216 | 0.068* | |
| C6 | 0.5521 (3) | 0.3437 (3) | 0.80899 (11) | 0.0678 (5) | |
| H6 | 0.4991 | 0.3687 | 0.7653 | 0.081* | |
| C7' | 0.5702 (3) | −0.2187 (2) | 0.68090 (10) | 0.0583 (4) | |
| H7' | 0.5269 | −0.2792 | 0.7257 | 0.070* | |
| C7 | 0.7456 (3) | 0.3370 (3) | 0.80531 (13) | 0.0742 (6) | |
| H7 | 0.8195 | 0.3559 | 0.7591 | 0.089* | |
| C8' | 0.6417 (2) | −0.3200 (2) | 0.61849 (10) | 0.0527 (4) | |
| H8' | 0.6475 | −0.4483 | 0.6199 | 0.063* | |
| C8 | 0.8287 (3) | 0.3032 (3) | 0.86844 (13) | 0.0684 (5) | |
| H8 | 0.9574 | 0.2993 | 0.8660 | 0.082* | |
| C9 | 0.7140 (2) | 0.2751 (2) | 0.93550 (11) | 0.0540 (4) | |
| C9' | 0.7049 (2) | −0.2241 (2) | 0.55332 (8) | 0.0419 (3) | |
| C10 | 0.2612 (2) | 0.2273 (2) | 1.05110 (9) | 0.0482 (4) | |
| C10' | 0.8024 (2) | 0.19645 (19) | 0.44251 (8) | 0.0396 (3) | |
| C11' | 0.8851 (2) | 0.2118 (2) | 0.35992 (8) | 0.0455 (4) | |
| H11A | 1.0210 | 0.1451 | 0.3524 | 0.055* | |
| H11B | 0.8214 | 0.1505 | 0.3322 | 0.055* | |
| C11 | 0.2210 (2) | 0.1842 (3) | 1.13506 (9) | 0.0562 (4) | |
| H11C | 0.3072 | 0.0628 | 1.1480 | 0.067* | |
| H11D | 0.2474 | 0.2809 | 1.1602 | 0.067* | |
| C12 | 0.0245 (3) | 0.1779 (3) | 1.16141 (9) | 0.0605 (5) | |
| C12' | 0.8620 (2) | 0.4067 (2) | 0.33086 (9) | 0.0513 (4) | |
| N13 | −0.1297 (3) | 0.1725 (3) | 1.18193 (9) | 0.0878 (6) | |
| N13' | 0.8429 (3) | 0.5597 (2) | 0.30820 (9) | 0.0806 (5) |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| O1 | 0.0436 (6) | 0.1027 (10) | 0.0585 (7) | −0.0291 (6) | −0.0166 (6) | 0.0039 (7) |
| O1' | 0.0829 (8) | 0.0340 (6) | 0.0491 (6) | −0.0248 (5) | −0.0035 (6) | −0.0054 (5) |
| N1 | 0.0409 (8) | 0.0647 (9) | 0.0868 (11) | −0.0155 (7) | −0.0217 (8) | −0.0100 (8) |
| N1' | 0.0611 (8) | 0.0298 (6) | 0.0566 (8) | −0.0163 (6) | −0.0112 (6) | −0.0059 (6) |
| C2 | 0.0469 (9) | 0.0597 (10) | 0.0689 (11) | −0.0150 (8) | −0.0187 (8) | −0.0087 (8) |
| C2' | 0.0521 (9) | 0.0379 (8) | 0.0453 (8) | −0.0158 (6) | −0.0082 (7) | −0.0056 (6) |
| C3 | 0.0412 (8) | 0.0451 (9) | 0.0602 (10) | −0.0126 (7) | −0.0144 (7) | −0.0072 (7) |
| C3' | 0.0432 (8) | 0.0323 (7) | 0.0435 (8) | −0.0136 (6) | −0.0109 (6) | −0.0027 (6) |
| C4 | 0.0420 (8) | 0.0367 (8) | 0.0674 (11) | −0.0124 (6) | −0.0128 (7) | −0.0038 (7) |
| C4' | 0.0409 (8) | 0.0333 (7) | 0.0461 (8) | −0.0130 (6) | −0.0123 (6) | −0.0011 (6) |
| C5' | 0.0566 (9) | 0.0388 (8) | 0.0501 (9) | −0.0144 (7) | −0.0095 (7) | −0.0043 (7) |
| C5 | 0.0509 (9) | 0.0527 (10) | 0.0689 (11) | −0.0184 (8) | −0.0160 (8) | 0.0048 (8) |
| C6' | 0.0671 (11) | 0.0573 (10) | 0.0458 (9) | −0.0172 (8) | −0.0067 (8) | −0.0043 (8) |
| C6 | 0.0761 (13) | 0.0590 (11) | 0.0706 (13) | −0.0260 (9) | −0.0147 (10) | 0.0103 (9) |
| C7' | 0.0656 (11) | 0.0587 (11) | 0.0514 (10) | −0.0237 (8) | −0.0092 (8) | 0.0103 (8) |
| C7 | 0.0741 (13) | 0.0641 (12) | 0.0810 (14) | −0.0287 (10) | 0.0052 (11) | 0.0041 (10) |
| C8' | 0.0611 (10) | 0.0385 (8) | 0.0623 (11) | −0.0213 (7) | −0.0151 (8) | 0.0093 (7) |
| C8 | 0.0486 (10) | 0.0584 (11) | 0.0983 (16) | −0.0215 (8) | −0.0032 (10) | −0.0021 (10) |
| C9 | 0.0424 (9) | 0.0429 (9) | 0.0794 (12) | −0.0144 (7) | −0.0114 (8) | −0.0055 (8) |
| C9' | 0.0443 (8) | 0.0348 (7) | 0.0498 (9) | −0.0136 (6) | −0.0119 (7) | −0.0016 (6) |
| C10 | 0.0438 (8) | 0.0472 (9) | 0.0576 (10) | −0.0131 (7) | −0.0148 (7) | −0.0065 (7) |
| C10' | 0.0432 (8) | 0.0347 (7) | 0.0446 (8) | −0.0140 (6) | −0.0106 (6) | −0.0026 (6) |
| C11' | 0.0512 (9) | 0.0421 (8) | 0.0451 (9) | −0.0155 (7) | −0.0081 (7) | −0.0026 (7) |
| C11 | 0.0554 (10) | 0.0621 (10) | 0.0551 (10) | −0.0163 (8) | −0.0154 (8) | −0.0085 (8) |
| C12 | 0.0591 (12) | 0.0765 (12) | 0.0430 (9) | −0.0117 (9) | −0.0078 (8) | −0.0100 (8) |
| C12' | 0.0641 (10) | 0.0487 (10) | 0.0432 (9) | −0.0227 (8) | −0.0044 (8) | 0.0001 (7) |
| N13 | 0.0640 (11) | 0.1429 (18) | 0.0513 (10) | −0.0231 (11) | −0.0009 (8) | −0.0111 (10) |
| N13' | 0.1215 (15) | 0.0564 (10) | 0.0620 (10) | −0.0331 (10) | −0.0029 (10) | 0.0065 (8) |
| O1—C10 | 1.2190 (18) | C5—H5 | 0.9300 |
| O1'—C10' | 1.2173 (17) | C6'—C7' | 1.389 (2) |
| N1—C2 | 1.335 (2) | C6'—H6' | 0.9300 |
| N1—C9 | 1.379 (2) | C6—C7 | 1.396 (3) |
| N1—H1 | 0.8600 | C6—H6 | 0.9300 |
| N1'—C2' | 1.3372 (19) | C7'—C8' | 1.367 (2) |
| N1'—C9' | 1.3755 (19) | C7'—H7' | 0.9300 |
| N1'—H1' | 0.8600 | C7—C8 | 1.371 (3) |
| C2—C3 | 1.379 (2) | C7—H7 | 0.9300 |
| C2—H2 | 0.9300 | C8'—C9' | 1.381 (2) |
| C2'—C3' | 1.373 (2) | C8'—H8' | 0.9300 |
| C2'—H2' | 0.9300 | C8—C9 | 1.376 (3) |
| C3—C10 | 1.429 (2) | C8—H8 | 0.9300 |
| C3—C4 | 1.431 (2) | C10—C11 | 1.517 (2) |
| C3'—C10' | 1.4331 (19) | C10'—C11' | 1.516 (2) |
| C3'—C4' | 1.436 (2) | C11'—C12' | 1.445 (2) |
| C4—C5 | 1.393 (2) | C11'—H11A | 0.9700 |
| C4—C9 | 1.406 (2) | C11'—H11B | 0.9700 |
| C4'—C5' | 1.393 (2) | C11—C12 | 1.443 (3) |
| C4'—C9' | 1.3987 (19) | C11—H11C | 0.9700 |
| C5'—C6' | 1.372 (2) | C11—H11D | 0.9700 |
| C5'—H5' | 0.9300 | C12—N13 | 1.133 (2) |
| C5—C6 | 1.369 (3) | C12'—N13' | 1.132 (2) |
| C2—N1—C9 | 109.94 (14) | C8'—C7'—H7' | 119.4 |
| C2—N1—H1 | 125.0 | C6'—C7'—H7' | 119.4 |
| C9—N1—H1 | 125.0 | C8—C7—C6 | 121.35 (19) |
| C2'—N1'—C9' | 109.56 (12) | C8—C7—H7 | 119.3 |
| C2'—N1'—H1' | 125.2 | C6—C7—H7 | 119.3 |
| C9'—N1'—H1' | 125.2 | C7'—C8'—C9' | 117.34 (15) |
| N1—C2—C3 | 109.81 (16) | C7'—C8'—H8' | 121.3 |
| N1—C2—H2 | 125.1 | C9'—C8'—H8' | 121.3 |
| C3—C2—H2 | 125.1 | C7—C8—C9 | 117.29 (18) |
| N1'—C2'—C3' | 110.07 (14) | C7—C8—H8 | 121.4 |
| N1'—C2'—H2' | 125.0 | C9—C8—H8 | 121.4 |
| C3'—C2'—H2' | 125.0 | C8—C9—N1 | 130.03 (16) |
| C2—C3—C10 | 126.55 (16) | C8—C9—C4 | 122.72 (17) |
| C2—C3—C4 | 106.56 (14) | N1—C9—C4 | 107.25 (15) |
| C10—C3—C4 | 126.89 (14) | N1'—C9'—C8' | 129.55 (14) |
| C2'—C3'—C10' | 126.66 (14) | N1'—C9'—C4' | 107.66 (13) |
| C2'—C3'—C4' | 106.34 (12) | C8'—C9'—C4' | 122.78 (14) |
| C10'—C3'—C4' | 126.99 (13) | O1—C10—C3 | 122.51 (15) |
| C5—C4—C9 | 118.60 (16) | O1—C10—C11 | 119.87 (15) |
| C5—C4—C3 | 134.95 (15) | C3—C10—C11 | 117.61 (13) |
| C9—C4—C3 | 106.45 (14) | O1'—C10'—C3' | 122.74 (13) |
| C5'—C4'—C9' | 118.54 (13) | O1'—C10'—C11' | 120.06 (13) |
| C5'—C4'—C3' | 135.07 (13) | C3'—C10'—C11' | 117.20 (12) |
| C9'—C4'—C3' | 106.36 (12) | C12'—C11'—C10' | 112.33 (13) |
| C6'—C5'—C4' | 118.70 (14) | C12'—C11'—H11A | 109.1 |
| C6'—C5'—H5' | 120.6 | C10'—C11'—H11A | 109.1 |
| C4'—C5'—H5' | 120.6 | C12'—C11'—H11B | 109.1 |
| C6—C5—C4 | 118.94 (17) | C10'—C11'—H11B | 109.1 |
| C6—C5—H5 | 120.5 | H11A—C11'—H11B | 107.9 |
| C4—C5—H5 | 120.5 | C12—C11—C10 | 112.34 (14) |
| C5'—C6'—C7' | 121.46 (16) | C12—C11—H11C | 109.1 |
| C5'—C6'—H6' | 119.3 | C10—C11—H11C | 109.1 |
| C7'—C6'—H6' | 119.3 | C12—C11—H11D | 109.1 |
| C5—C6—C7 | 121.09 (19) | C10—C11—H11D | 109.1 |
| C5—C6—H6 | 119.5 | H11C—C11—H11D | 107.9 |
| C7—C6—H6 | 119.5 | N13—C12—C11 | 179.8 (2) |
| C8'—C7'—C6' | 121.15 (16) | N13'—C12'—C11' | 179.6 (2) |
| C9—N1—C2—C3 | 0.0 (2) | C2—N1—C9—C4 | 0.35 (18) |
| C9'—N1'—C2'—C3' | 0.34 (17) | C5—C4—C9—C8 | −0.7 (2) |
| N1—C2—C3—C10 | 178.76 (15) | C3—C4—C9—C8 | 179.28 (15) |
| N1—C2—C3—C4 | −0.41 (19) | C5—C4—C9—N1 | 179.39 (14) |
| N1'—C2'—C3'—C10' | 179.69 (14) | C3—C4—C9—N1 | −0.59 (17) |
| N1'—C2'—C3'—C4' | −0.69 (17) | C2'—N1'—C9'—C8' | 179.31 (16) |
| C2—C3—C4—C5 | −179.36 (17) | C2'—N1'—C9'—C4' | 0.18 (17) |
| C10—C3—C4—C5 | 1.5 (3) | C7'—C8'—C9'—N1' | −177.93 (15) |
| C2—C3—C4—C9 | 0.61 (17) | C7'—C8'—C9'—C4' | 1.1 (2) |
| C10—C3—C4—C9 | −178.56 (15) | C5'—C4'—C9'—N1' | 177.78 (13) |
| C2'—C3'—C4'—C5' | −177.20 (16) | C3'—C4'—C9'—N1' | −0.59 (16) |
| C10'—C3'—C4'—C5' | 2.4 (3) | C5'—C4'—C9'—C8' | −1.4 (2) |
| C2'—C3'—C4'—C9' | 0.78 (16) | C3'—C4'—C9'—C8' | −179.80 (14) |
| C10'—C3'—C4'—C9' | −179.60 (14) | C2—C3—C10—O1 | −179.17 (16) |
| C9'—C4'—C5'—C6' | 0.4 (2) | C4—C3—C10—O1 | −0.2 (3) |
| C3'—C4'—C5'—C6' | 178.23 (16) | C2—C3—C10—C11 | 0.1 (2) |
| C9—C4—C5—C6 | 0.2 (2) | C4—C3—C10—C11 | 179.09 (15) |
| C3—C4—C5—C6 | −179.88 (17) | C2'—C3'—C10'—O1' | −179.31 (15) |
| C4'—C5'—C6'—C7' | 0.8 (3) | C4'—C3'—C10'—O1' | 1.1 (2) |
| C4—C5—C6—C7 | 0.6 (3) | C2'—C3'—C10'—C11' | −0.3 (2) |
| C5'—C6'—C7'—C8' | −1.2 (3) | C4'—C3'—C10'—C11' | −179.83 (13) |
| C5—C6—C7—C8 | −0.9 (3) | O1'—C10'—C11'—C12' | −14.8 (2) |
| C6'—C7'—C8'—C9' | 0.2 (3) | C3'—C10'—C11'—C12' | 166.12 (13) |
| C6—C7—C8—C9 | 0.3 (3) | O1—C10—C11—C12 | −2.2 (2) |
| C7—C8—C9—N1 | −179.67 (17) | C3—C10—C11—C12 | 178.56 (15) |
| C7—C8—C9—C4 | 0.5 (3) | C10—C11—C12—N13 | 51 (88) |
| C2—N1—C9—C8 | −179.50 (18) | C10'—C11'—C12'—N13' | −58 (25) |
| D—H···A | D—H | H···A | D···A | D—H···A |
| N1—H1···O1i | 0.86 | 1.98 | 2.8146 (18) | 163 |
| C2—H2···N13i | 0.93 | 2.59 | 3.236 (2) | 127 |
| N1'—H1'···O1'ii | 0.86 | 2.00 | 2.8166 (15) | 158 |
| Symmetry codes: (i) x+1, y, z; (ii) x, y−1, z. |
| D—H···A | D—H | H···A | D···A | D—H···A |
| N1—H1···O1i | 0.86 | 1.98 | 2.8146 (18) | 163 |
| C2—H2···N13i | 0.93 | 2.59 | 3.236 (2) | 127 |
| N1'—H1'···O1'ii | 0.86 | 2.00 | 2.8166 (15) | 158 |
| Symmetry codes: (i) x+1, y, z; (ii) x, y−1, z. |
PR thanks Dr Babu Varghese, SAIF, IIT-Madras, India, for his help with the data collection.
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Indole derivatives are used as bioactive drugs (Stevenson et al., 2000) and they exibit anti-allergic, central nervous system depressant and muscle relaxant properties (Harris & Uhle 1960; Ho et al., 1986). Indoles have been proved to display high aldose reductase inhibitory activity (Rajeswaran et al., 1999). Against this background and to ascertain the molecular conformation, the structure determination of the title compound has been carried out.
There are two crystallographically independent molecules in the asymmetric unit and they are approximately perpendicular to each other [79.97 (6)°]. In both molecules the indole ring systems are planar and the sum of the angles at N1 (359.95°) and N1' (359.94°) are in accordance with sp2 hybridization. The bond angles of the cyano group [179.8 (2) and 179.6 (2)°] in both molecules show their linear character. The C≡N bond distances [1.133 (2) and 1.131 (2) Å] are comparable with the literature values (Ramesh et al., 2008).
The crystal packing is covered by C—H···N, C—H···O and C—H···π types intermolecular interactions in addition to van der Waals forces. N1 atom in one of the molecules donates one proton to O1 (-1 + x, y, z) which connects the molecules into a one dimensional C6 chain (Bernstein et al., 1995) running along the a axis, whereas in the other molecule at N1' forms similar network with O1' (x, 1 + y, z) along the b axis. The combination of N1—H1···O1 and C2—H2···N13 hydrogen bonds form a R22 (9) dimer chain running along the a axis.