Acta Cryst. (2008). E64, o730 [ doi:10.1107/S1600536808007150 ]
In the molecule of the title compound, C12H6N2O3S, the central heterocyclic ring is oriented at dihedral angles of 3.25 (6) and 2.28 (7)° with respect to the benzene and pyridine rings, respectively. The dihedral angle between the benzene and pyridine rings is 5.53 (7)°. In the crystal structure, intermolecular C-H
O hydrogen bonds link the molecules into chains.
A mixture of 2-chloronicotinic acid (1.57 g, 10 mmol) and thiophenol (2 ml) was heated under reflux for 2 h to produce 2-(phenylsulfanyl)pyridine-3- carboxylic acid (Mann & Reid, 1952). The polyphosphoric acid (PPA) (Hidetoshi, 1997) was used to cyclize the produced acid, and 5H-thiochromeno[2,3-b]pyridin- 5-one was obtained. The cyclized product was nitrated using KNO3 and H2SO4 (Kurger & Mann, 1955). Two isomers, 7-nitro-5H-thiochromeno[2,3-b]- pyridin-5-one, (I), and 9-nitro-5H-thiochromeno[2,3-b]pyridin-5-one, (III), were obtained, and they were separated using acetic acid and ethanol, respectively. Crystals suitable for X-ray diffraction were obtained by cooling the saturated solution of (I) in glacial acetic acid.
H atoms were positioned geometrically, with C—H = 0.93 Å for aromatic H and constrained to ride on their parent atoms with Uiso(H) = 1.2Ueq(C).
Data collection: APEX2 (Bruker, 2007); cell refinement: APEX2 (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 for Windows (Farrugia, 1997) and PLATON (Spek, 2003); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON (Spek, 2003).
![[Figure 1]](./hk2433fig1thm.gif)
| Fig. 1. The molecular structure of the title molecule, with the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. |
![[Figure 2]](./hk2433fig2thm.gif)
| Fig. 2. A partial packing diagram of (I). Hydrogen bonds are shown as dashed lines |
| C12H6N2O3S | F000 = 528 |
| Mr = 258.25 | Dx = 1.638 Mg m−3 |
| Orthorhombic, Pca21 | Mo Kα radiation λ = 0.71073 Å |
| Hall symbol: P 2c -2ac | Cell parameters from 1444 reflections |
| a = 24.822 (2) Å | θ = 1.7–29.2º |
| b = 3.8884 (2) Å | µ = 0.31 mm−1 |
| c = 10.8505 (7) Å | T = 296 (2) K |
| V = 1047.28 (12) Å3 | Prismatic, light yellow |
| Z = 4 | 0.25 × 0.12 × 0.08 mm |
| Bruker KappaAPEXII CCD diffractometer | 2491 independent reflections |
| Radiation source: fine-focus sealed tube | 2038 reflections with I > 2σ(I) |
| Monochromator: graphite | Rint = 0.031 |
| Detector resolution: 7.5 pixels mm-1 | θmax = 29.1º |
| T = 296(2) K | θmin = 2.5º |
| ω scans | h = −31→32 |
| Absorption correction: multi-scan (SADABS; Bruker, 2005) | k = −5→5 |
| Tmin = 0.927, Tmax = 0.976 | l = −14→13 |
| 6571 measured reflections |
| Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
| Least-squares matrix: full | H-atom parameters constrained |
| R[F2 > 2σ(F2)] = 0.036 | w = 1/[σ2(Fo2) + (0.0408P)2] where P = (Fo2 + 2Fc2)/3 |
| wR(F2) = 0.083 | (Δ/σ)max < 0.001 |
| S = 1.02 | Δρmax = 0.21 e Å−3 |
| 2491 reflections | Δρmin = −0.21 e Å−3 |
| 163 parameters | Extinction correction: none |
| 1 restraint | Absolute structure: Flack (1983), 1047 Friedel pairs |
| Primary atom site location: structure-invariant direct methods | Flack parameter: 0.03 (8) |
| Secondary atom site location: difference Fourier map |
| C12H6N2O3S | V = 1047.28 (12) Å3 |
| Mr = 258.25 | Z = 4 |
| Orthorhombic, Pca21 | Mo Kα |
| a = 24.822 (2) Å | µ = 0.31 mm−1 |
| b = 3.8884 (2) Å | T = 296 (2) K |
| c = 10.8505 (7) Å | 0.25 × 0.12 × 0.08 mm |
| Bruker KappaAPEXII CCD diffractometer | 2491 independent reflections |
| Absorption correction: multi-scan (SADABS; Bruker, 2005) | 2038 reflections with I > 2σ(I) |
| Tmin = 0.927, Tmax = 0.976 | Rint = 0.031 |
| 6571 measured reflections |
| R[F2 > 2σ(F2)] = 0.036 | H-atom parameters constrained |
| wR(F2) = 0.083 | Δρmax = 0.21 e Å−3 |
| S = 1.02 | Δρmin = −0.21 e Å−3 |
| 2491 reflections | Absolute structure: Flack (1983), 1047 Friedel pairs |
| 163 parameters | Flack parameter: 0.03 (8) |
| 1 restraint |
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 | ||
| S1 | 0.39024 (2) | 0.42115 (12) | 0.39781 (5) | 0.03676 (14) | |
| O1 | 0.12993 (7) | 0.2278 (5) | 0.3058 (2) | 0.0694 (6) | |
| O2 | 0.15811 (8) | −0.0812 (6) | 0.1535 (2) | 0.0660 (6) | |
| O3 | 0.34609 (7) | −0.1679 (5) | 0.06332 (15) | 0.0491 (5) | |
| N1 | 0.16584 (8) | 0.1026 (5) | 0.2436 (2) | 0.0433 (5) | |
| N2 | 0.48349 (8) | 0.3607 (5) | 0.3026 (2) | 0.0452 (5) | |
| C1 | 0.32646 (8) | 0.3151 (5) | 0.34578 (19) | 0.0285 (4) | |
| C2 | 0.28373 (9) | 0.4190 (5) | 0.4212 (2) | 0.0353 (5) | |
| H2 | 0.2910 | 0.5338 | 0.4946 | 0.042* | |
| C3 | 0.23123 (8) | 0.3542 (5) | 0.3888 (2) | 0.0354 (5) | |
| H3 | 0.2029 | 0.4264 | 0.4384 | 0.042* | |
| C4 | 0.22173 (9) | 0.1777 (5) | 0.2796 (2) | 0.0336 (5) | |
| C5 | 0.26260 (9) | 0.0689 (5) | 0.2047 (2) | 0.0321 (5) | |
| H5 | 0.2547 | −0.0517 | 0.1329 | 0.039* | |
| C6 | 0.31604 (8) | 0.1380 (5) | 0.23549 (19) | 0.0282 (4) | |
| C7 | 0.35825 (9) | 0.0152 (5) | 0.1503 (2) | 0.0314 (5) | |
| C8 | 0.41454 (9) | 0.1140 (5) | 0.17226 (19) | 0.0313 (4) | |
| C9 | 0.45386 (10) | 0.0293 (6) | 0.0858 (2) | 0.0440 (6) | |
| H9 | 0.4444 | −0.0817 | 0.0130 | 0.053* | |
| C10 | 0.50665 (11) | 0.1111 (6) | 0.1089 (3) | 0.0522 (7) | |
| H10 | 0.5334 | 0.0578 | 0.0519 | 0.063* | |
| C11 | 0.51950 (10) | 0.2730 (7) | 0.2176 (3) | 0.0528 (7) | |
| H11 | 0.5555 | 0.3243 | 0.2326 | 0.063* | |
| C12 | 0.43215 (9) | 0.2827 (5) | 0.27847 (19) | 0.0333 (5) |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| S1 | 0.0323 (3) | 0.0429 (3) | 0.0350 (3) | −0.0032 (2) | −0.0032 (3) | −0.0060 (3) |
| O1 | 0.0317 (10) | 0.0938 (13) | 0.0825 (15) | 0.0109 (11) | 0.0082 (11) | −0.0090 (13) |
| O2 | 0.0366 (11) | 0.0929 (15) | 0.0685 (14) | −0.0117 (10) | −0.0072 (11) | −0.0173 (12) |
| O3 | 0.0395 (10) | 0.0618 (11) | 0.0458 (10) | −0.0038 (8) | 0.0042 (8) | −0.0236 (9) |
| N1 | 0.0265 (11) | 0.0552 (13) | 0.0481 (12) | 0.0024 (10) | 0.0022 (9) | 0.0093 (11) |
| N2 | 0.0309 (10) | 0.0479 (11) | 0.0569 (13) | −0.0041 (9) | −0.0028 (10) | 0.0007 (10) |
| C1 | 0.0267 (10) | 0.0267 (9) | 0.0322 (10) | −0.0001 (8) | −0.0014 (9) | 0.0027 (8) |
| C2 | 0.0412 (13) | 0.0361 (10) | 0.0285 (13) | 0.0011 (9) | 0.0020 (10) | −0.0011 (9) |
| C3 | 0.0311 (10) | 0.0384 (10) | 0.0366 (12) | 0.0055 (8) | 0.0114 (10) | 0.0004 (12) |
| C4 | 0.0261 (11) | 0.0352 (10) | 0.0395 (12) | 0.0001 (9) | −0.0012 (9) | 0.0088 (10) |
| C5 | 0.0308 (12) | 0.0350 (10) | 0.0305 (10) | −0.0006 (9) | −0.0009 (9) | 0.0020 (9) |
| C6 | 0.0282 (12) | 0.0273 (9) | 0.0290 (10) | −0.0011 (8) | −0.0007 (9) | 0.0035 (8) |
| C7 | 0.0307 (12) | 0.0349 (10) | 0.0285 (11) | −0.0004 (9) | 0.0023 (10) | 0.0008 (9) |
| C8 | 0.0295 (11) | 0.0308 (10) | 0.0337 (11) | 0.0023 (9) | 0.0017 (10) | 0.0027 (9) |
| C9 | 0.0391 (14) | 0.0458 (12) | 0.0471 (14) | 0.0004 (11) | 0.0097 (11) | 0.0000 (11) |
| C10 | 0.0334 (15) | 0.0552 (15) | 0.0681 (18) | −0.0003 (11) | 0.0193 (13) | −0.0021 (14) |
| C11 | 0.0279 (13) | 0.0528 (14) | 0.078 (2) | −0.0015 (11) | 0.0018 (14) | 0.0024 (15) |
| C12 | 0.0284 (12) | 0.0301 (10) | 0.0414 (12) | −0.0003 (9) | −0.0018 (10) | 0.0033 (9) |
| S1—C1 | 1.731 (2) | C5—C6 | 1.394 (3) |
| S1—C12 | 1.746 (2) | C5—H5 | 0.9300 |
| N1—O1 | 1.219 (3) | C7—O3 | 1.220 (3) |
| N1—O2 | 1.226 (3) | C7—C8 | 1.469 (3) |
| N1—C4 | 1.471 (3) | C7—C6 | 1.476 (3) |
| N2—C11 | 1.329 (3) | C8—C9 | 1.393 (3) |
| C1—C2 | 1.400 (3) | C9—C10 | 1.372 (4) |
| C1—C6 | 1.405 (3) | C9—H9 | 0.9300 |
| C2—C3 | 1.373 (3) | C10—C11 | 1.374 (4) |
| C2—H2 | 0.9300 | C10—H10 | 0.9300 |
| C3—H3 | 0.9300 | C11—H11 | 0.9300 |
| C4—C3 | 1.389 (3) | C12—N2 | 1.336 (3) |
| C5—C4 | 1.367 (3) | C12—C8 | 1.396 (3) |
| C1—S1—C12 | 103.27 (10) | C5—C6—C7 | 117.57 (19) |
| O1—N1—O2 | 124.0 (2) | C1—C6—C7 | 124.14 (18) |
| O1—N1—C4 | 117.6 (2) | O3—C7—C8 | 120.90 (19) |
| O2—N1—C4 | 118.4 (2) | O3—C7—C6 | 119.84 (19) |
| C11—N2—C12 | 116.6 (2) | C8—C7—C6 | 119.27 (18) |
| C2—C1—C6 | 120.01 (19) | C9—C8—C12 | 116.6 (2) |
| C2—C1—S1 | 115.70 (16) | C9—C8—C7 | 119.7 (2) |
| C6—C1—S1 | 124.28 (16) | C12—C8—C7 | 123.69 (19) |
| C3—C2—C1 | 121.1 (2) | C10—C9—C8 | 119.4 (2) |
| C3—C2—H2 | 119.5 | C10—C9—H9 | 120.3 |
| C1—C2—H2 | 119.5 | C8—C9—H9 | 120.3 |
| C2—C3—C4 | 118.1 (2) | C9—C10—C11 | 119.0 (2) |
| C2—C3—H3 | 121.0 | C9—C10—H10 | 120.5 |
| C4—C3—H3 | 121.0 | C11—C10—H10 | 120.5 |
| C5—C4—C3 | 122.3 (2) | N2—C11—C10 | 123.8 (2) |
| C5—C4—N1 | 118.7 (2) | N2—C11—H11 | 118.1 |
| C3—C4—N1 | 119.0 (2) | C10—C11—H11 | 118.1 |
| C4—C5—C6 | 120.3 (2) | N2—C12—C8 | 124.5 (2) |
| C4—C5—H5 | 119.9 | N2—C12—S1 | 110.68 (17) |
| C6—C5—H5 | 119.9 | C8—C12—S1 | 124.79 (17) |
| C5—C6—C1 | 118.29 (19) | ||
| C12—S1—C1—C2 | −175.98 (15) | C4—C5—C6—C1 | 1.2 (3) |
| C12—S1—C1—C6 | 3.75 (19) | C4—C5—C6—C7 | −179.64 (18) |
| C1—S1—C12—N2 | 177.32 (15) | O3—C7—C6—C5 | −6.9 (3) |
| C1—S1—C12—C8 | −2.6 (2) | C8—C7—C6—C5 | 173.52 (18) |
| O1—N1—C4—C5 | −173.6 (2) | O3—C7—C6—C1 | 172.23 (19) |
| O2—N1—C4—C5 | 6.4 (3) | C8—C7—C6—C1 | −7.3 (3) |
| O1—N1—C4—C3 | 6.8 (3) | O3—C7—C8—C9 | 7.0 (3) |
| O2—N1—C4—C3 | −173.2 (2) | C6—C7—C8—C9 | −173.5 (2) |
| C12—N2—C11—C10 | 0.2 (4) | O3—C7—C8—C12 | −171.0 (2) |
| C6—C1—C2—C3 | −0.7 (3) | C6—C7—C8—C12 | 8.6 (3) |
| S1—C1—C2—C3 | 179.00 (16) | C7—C8—C9—C10 | −177.6 (2) |
| S1—C1—C6—C5 | 179.95 (15) | C12—C8—C9—C10 | 0.5 (3) |
| C2—C1—C6—C5 | −0.3 (3) | C8—C9—C10—C11 | 0.4 (4) |
| S1—C1—C6—C7 | 0.8 (3) | C9—C10—C11—N2 | −0.8 (4) |
| C2—C1—C6—C7 | −179.47 (18) | S1—C12—N2—C11 | −179.05 (18) |
| C1—C2—C3—C4 | 1.0 (3) | C8—C12—N2—C11 | 0.8 (3) |
| C5—C4—C3—C2 | −0.1 (3) | N2—C12—C8—C9 | −1.2 (3) |
| N1—C4—C3—C2 | 179.43 (19) | S1—C12—C8—C9 | 178.70 (16) |
| C6—C5—C4—C3 | −1.0 (3) | N2—C12—C8—C7 | 176.82 (19) |
| C6—C5—C4—N1 | 179.49 (18) | S1—C12—C8—C7 | −3.3 (3) |
| D—H···A | D—H | H···A | D···A | D—H···A |
| C3—H3···O3i | 0.93 | 2.41 | 3.275 (3) | 155 |
| Symmetry codes: (i) −x+1/2, y+1, z+1/2. |
| D—H···A | D—H | H···A | D···A | D—H···A |
| C3—H3···O3i | 0.93 | 2.41 | 3.275 (3) | 155 |
| Symmetry codes: (i) −x+1/2, y+1, z+1/2. |
The authors acknowledge the Higher Education Commision, Islamabad, Pakistan, for funding the purchase of the diffractometer.
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Pyridine containing compounds are widely distributed in nature. Drugs, dyes, alkoloids (Acheson et al., 1976), nalidixic acid and quinoline (Lesher et al., 1962), which are antibacterial, also contain pyridine rings in their structures. Heteroaromatic antitumor compounds have been prepared in recent years with the hope of increasing pharmacological effects. DNA intercalating agents, which are an important class of antitumor drugs, usually posses planar aromatic and heteroaromatic polycyclic system. Some thioxanthones have also shown effectiveness against tumor (Archer et al., 1982; Archer et al., 1988; Showalter et al., 1988). Heterocyclic compounds having S-atom in their ring can also be used as antioxidative agents.
The title compound, (I), is a member of azathioxanthone. It contains three planar six-membered rings; A (C1—C6), B (S1/C1/C6—C8/C12) and C (N2/C8—C12), in which they are oriented at dihedral angles of A/B = 3.25 (6), A/C = 5.53 (7) and B/C = 2.28 (7) °. So, they are also nearly coplanar. The CCDC search (Allen, 2002) showed that the crystal structure containing a similar skeleton [2-methyl-1-azathioxanthone, (II), (Atkinson et al., 2006)], has been reported, thus it is the only potential candidate for comparison of the bond lengths and angles in (I).
In (I), the S—C bonds are in the range of [1.731 (2)–1.746 (2) Å], while they are between [1.741 (3)–1.743 (3) Å], in (II).
In the crystal structure, intermolecular C—H···O hydrogen bonds (Table 1) link the molecules into chains (Fig. 2). These H-bonds seem to play an effective role in the stabilization of the structure.