organic compounds
2-(1,3-Benzothiazol-2-yl)-6-ethoxyphenol
aDepartment of Physics, C. Abdul Hakeem College of Engineering & Technology, Melvisharam, Vellore 632 509, India, bDepartment of Physics, Ranipettai Engineering College, Thenkadapathangal, Walaja 632 513, India, cDepartment of Organic Chemistry, University of Madras, Maraimalai Campus, Chennai 600 025, India, and dDepartment of Physics, Thanthai Periyar Government Institute of Technology, Vellore 632 002, India
*Correspondence e-mail: smurugavel27@gmail.com
In the title compound, C15H13NO2S, the benzothiazole unit is essentially planar [maximum deviation = −0.0099 (5) Å for the S atom] and is oriented at a dihedral angle of 4.8 (5)° with respect to the benzene ring. An intramolecular O—H⋯N hydrogen bond generates an S(6) ring motif. The crystal packing is stabilized by C—H⋯π interactions.
Related literature
For background to the applications of benzothiazoles in the chemical industry, see: Bradshaw et al. (2002); Delmas et al. (2002); Hutchinson et al. (2002). For the pharmacological activity of benzothiazole derivatives, see: Repiĉ et al. (2001); Schwartz et al. (1992). For related structures, see: Baryala et al. (2010); Zhang et al. (2008). For hydrogen-bond motifs, see: Bernstein et al. (1995).
Experimental
Crystal data
|
Refinement
|
Data collection: APEX2 (Bruker, 2004); cell APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (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 and PLATON (Spek, 2009).
Supporting information
10.1107/S160053681103114X/bt5597sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681103114X/bt5597Isup2.hkl
Supporting information file. DOI: 10.1107/S160053681103114X/bt5597Isup3.cml
A mixture of 3-ethoxy-2-hydroxybenzaldehyde (0.1g, 0.6 mmol) and 2-aminobenzenethiol (0.075g, 0.6 mmol) was placed in a round bottom flask and melted at 180 0C for 1h. After completion of the reaction as indicated by TLC, the crude product was washed with 5 mL of ethylacetate and hexane mixture (1:49 ratio) which successfully provided the pure product 2-(benzo[d]thiazol-2-yl)-6-ethoxyphenol as colorless solid (91%). The pure compound was crystallized from ethylacetate-hexane 2:10. Single crystals suitable for X-ray diffraction were obtained by slow evaporation of a ethylacetate solution at room temperature.
All the H atoms were positioned geometrically, with O-H = 0.82 Å and and C-H = 0.93 - 0.98 Å and constrained to ride on their parent atom, with Uiso(H)=1.5Ueq for methyl and hydroxyl H atoms and 1.2Ueq(C) for other H atoms.
Data collection: APEX2 (Bruker, 2004); cell
APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (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, 2009).C15H13NO2S | F(000) = 568 |
Mr = 271.32 | Dx = 1.425 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 5191 reflections |
a = 9.8739 (5) Å | θ = 2.5–34.1° |
b = 9.6222 (4) Å | µ = 0.25 mm−1 |
c = 13.3644 (6) Å | T = 293 K |
β = 95.269 (2)° | Block, yellow |
V = 1264.37 (10) Å3 | 0.24 × 0.22 × 0.16 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 5191 independent reflections |
Radiation source: fine-focus sealed tube | 3449 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.023 |
Detector resolution: 10.0 pixels mm-1 | θmax = 34.1°, θmin = 2.5° |
ω scans | h = −15→15 |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | k = −15→9 |
Tmin = 0.941, Tmax = 0.960 | l = −21→19 |
19076 measured reflections |
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)] = 0.041 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.125 | H-atom parameters constrained |
S = 1.01 | w = 1/[σ2(Fo2) + (0.0658P)2 + 0.1388P] where P = (Fo2 + 2Fc2)/3 |
5191 reflections | (Δ/σ)max < 0.001 |
173 parameters | Δρmax = 0.36 e Å−3 |
0 restraints | Δρmin = −0.21 e Å−3 |
C15H13NO2S | V = 1264.37 (10) Å3 |
Mr = 271.32 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 9.8739 (5) Å | µ = 0.25 mm−1 |
b = 9.6222 (4) Å | T = 293 K |
c = 13.3644 (6) Å | 0.24 × 0.22 × 0.16 mm |
β = 95.269 (2)° |
Bruker APEXII CCD diffractometer | 5191 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 3449 reflections with I > 2σ(I) |
Tmin = 0.941, Tmax = 0.960 | Rint = 0.023 |
19076 measured reflections |
R[F2 > 2σ(F2)] = 0.041 | 0 restraints |
wR(F2) = 0.125 | H-atom parameters constrained |
S = 1.01 | Δρmax = 0.36 e Å−3 |
5191 reflections | Δρmin = −0.21 e Å−3 |
173 parameters |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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 | 0.05727 (3) | 0.30307 (3) | 0.19431 (2) | 0.03712 (10) | |
N1 | 0.02751 (10) | 0.27133 (10) | 0.00112 (7) | 0.0326 (2) | |
C8 | −0.12040 (11) | 0.11723 (12) | 0.08584 (8) | 0.0313 (2) | |
C13 | −0.18273 (11) | 0.06427 (12) | −0.00477 (8) | 0.0312 (2) | |
O2 | −0.33618 (10) | −0.08310 (10) | −0.09512 (6) | 0.0439 (2) | |
O1 | −0.15176 (10) | 0.10695 (10) | −0.09587 (6) | 0.0424 (2) | |
H1 | −0.0923 | 0.1666 | −0.0891 | 0.064* | |
C1 | −0.01672 (11) | 0.22478 (12) | 0.08401 (8) | 0.0309 (2) | |
C12 | −0.28288 (12) | −0.03998 (12) | −0.00288 (8) | 0.0332 (2) | |
C11 | −0.31818 (13) | −0.09032 (13) | 0.08807 (9) | 0.0377 (3) | |
H11 | −0.3841 | −0.1591 | 0.0893 | 0.045* | |
C2 | 0.12562 (11) | 0.37329 (12) | 0.02054 (8) | 0.0312 (2) | |
C7 | 0.15529 (12) | 0.40571 (12) | 0.12266 (8) | 0.0328 (2) | |
C9 | −0.15855 (13) | 0.06359 (13) | 0.17719 (9) | 0.0393 (3) | |
H9 | −0.1177 | 0.0977 | 0.2377 | 0.047* | |
C14 | −0.43972 (13) | −0.18786 (12) | −0.09985 (10) | 0.0378 (3) | |
H14A | −0.5186 | −0.1550 | −0.0686 | 0.045* | |
H14B | −0.4060 | −0.2714 | −0.0654 | 0.045* | |
C10 | −0.25549 (14) | −0.03849 (14) | 0.17758 (9) | 0.0408 (3) | |
H10 | −0.2794 | −0.0733 | 0.2384 | 0.049* | |
C3 | 0.19474 (13) | 0.44135 (13) | −0.05155 (9) | 0.0389 (3) | |
H3 | 0.1766 | 0.4205 | −0.1194 | 0.047* | |
C6 | 0.25186 (13) | 0.50573 (13) | 0.15417 (9) | 0.0400 (3) | |
H6 | 0.2709 | 0.5271 | 0.2219 | 0.048* | |
C4 | 0.29027 (14) | 0.53996 (14) | −0.02046 (10) | 0.0444 (3) | |
H4 | 0.3370 | 0.5860 | −0.0679 | 0.053* | |
C15 | −0.47613 (16) | −0.21685 (16) | −0.20937 (11) | 0.0508 (3) | |
H15A | −0.5093 | −0.1333 | −0.2424 | 0.076* | |
H15B | −0.5454 | −0.2871 | −0.2166 | 0.076* | |
H15C | −0.3970 | −0.2487 | −0.2392 | 0.076* | |
C5 | 0.31827 (14) | 0.57200 (14) | 0.08114 (11) | 0.0451 (3) | |
H5 | 0.3831 | 0.6395 | 0.1001 | 0.054* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.04228 (17) | 0.04402 (18) | 0.02515 (13) | −0.00088 (12) | 0.00359 (11) | −0.00212 (11) |
N1 | 0.0336 (5) | 0.0369 (5) | 0.0273 (4) | −0.0006 (4) | 0.0023 (4) | 0.0005 (4) |
C8 | 0.0331 (5) | 0.0336 (5) | 0.0274 (5) | 0.0030 (4) | 0.0044 (4) | 0.0008 (4) |
C13 | 0.0348 (5) | 0.0321 (5) | 0.0274 (5) | 0.0033 (4) | 0.0060 (4) | 0.0013 (4) |
O2 | 0.0518 (5) | 0.0482 (5) | 0.0319 (4) | −0.0162 (4) | 0.0042 (4) | −0.0041 (4) |
O1 | 0.0528 (5) | 0.0484 (5) | 0.0264 (4) | −0.0143 (4) | 0.0059 (3) | 0.0005 (3) |
C1 | 0.0326 (5) | 0.0340 (5) | 0.0262 (5) | 0.0046 (4) | 0.0026 (4) | 0.0001 (4) |
C12 | 0.0358 (6) | 0.0331 (5) | 0.0311 (5) | 0.0016 (4) | 0.0056 (4) | −0.0016 (4) |
C11 | 0.0400 (6) | 0.0372 (6) | 0.0371 (6) | −0.0022 (5) | 0.0107 (5) | 0.0011 (5) |
C2 | 0.0326 (5) | 0.0317 (5) | 0.0289 (5) | 0.0027 (4) | −0.0001 (4) | 0.0002 (4) |
C7 | 0.0349 (6) | 0.0343 (5) | 0.0288 (5) | 0.0048 (4) | 0.0013 (4) | −0.0011 (4) |
C9 | 0.0448 (7) | 0.0467 (7) | 0.0267 (5) | −0.0009 (5) | 0.0054 (5) | 0.0013 (5) |
C14 | 0.0345 (6) | 0.0357 (6) | 0.0435 (6) | −0.0020 (5) | 0.0041 (5) | −0.0015 (5) |
C10 | 0.0466 (7) | 0.0464 (7) | 0.0308 (5) | −0.0012 (6) | 0.0107 (5) | 0.0056 (5) |
C3 | 0.0439 (6) | 0.0430 (6) | 0.0295 (5) | −0.0038 (5) | 0.0015 (5) | 0.0042 (5) |
C6 | 0.0429 (7) | 0.0407 (6) | 0.0354 (6) | −0.0005 (5) | −0.0017 (5) | −0.0073 (5) |
C4 | 0.0486 (7) | 0.0446 (7) | 0.0398 (6) | −0.0084 (6) | 0.0028 (5) | 0.0065 (5) |
C15 | 0.0511 (8) | 0.0542 (8) | 0.0453 (7) | −0.0084 (6) | −0.0059 (6) | −0.0035 (6) |
C5 | 0.0467 (7) | 0.0403 (6) | 0.0473 (7) | −0.0074 (6) | −0.0016 (6) | −0.0038 (5) |
S1—C7 | 1.7318 (12) | C7—C6 | 1.3925 (17) |
S1—C1 | 1.7539 (11) | C9—C10 | 1.3718 (18) |
N1—C1 | 1.3067 (14) | C9—H9 | 0.9300 |
N1—C2 | 1.3864 (15) | C14—C15 | 1.5010 (18) |
C8—C13 | 1.4028 (15) | C14—H14A | 0.9700 |
C8—C9 | 1.4082 (15) | C14—H14B | 0.9700 |
C8—C1 | 1.4575 (16) | C10—H10 | 0.9300 |
C13—O1 | 1.3464 (13) | C3—C4 | 1.3750 (18) |
C13—C12 | 1.4105 (16) | C3—H3 | 0.9300 |
O2—C12 | 1.3600 (14) | C6—C5 | 1.3809 (19) |
O2—C14 | 1.4330 (14) | C6—H6 | 0.9300 |
O1—H1 | 0.8200 | C4—C5 | 1.3950 (19) |
C12—C11 | 1.3825 (16) | C4—H4 | 0.9300 |
C11—C10 | 1.3881 (18) | C15—H15A | 0.9600 |
C11—H11 | 0.9300 | C15—H15B | 0.9600 |
C2—C3 | 1.3941 (16) | C15—H15C | 0.9600 |
C2—C7 | 1.4044 (15) | C5—H5 | 0.9300 |
C7—S1—C1 | 89.48 (5) | O2—C14—C15 | 106.25 (10) |
C1—N1—C2 | 111.47 (9) | O2—C14—H14A | 110.5 |
C13—C8—C9 | 118.96 (11) | C15—C14—H14A | 110.5 |
C13—C8—C1 | 119.77 (10) | O2—C14—H14B | 110.5 |
C9—C8—C1 | 121.26 (10) | C15—C14—H14B | 110.5 |
O1—C13—C8 | 123.48 (10) | H14A—C14—H14B | 108.7 |
O1—C13—C12 | 116.80 (10) | C9—C10—C11 | 120.67 (11) |
C8—C13—C12 | 119.71 (10) | C9—C10—H10 | 119.7 |
C12—O2—C14 | 118.02 (9) | C11—C10—H10 | 119.7 |
C13—O1—H1 | 109.5 | C4—C3—C2 | 118.76 (11) |
N1—C1—C8 | 123.20 (10) | C4—C3—H3 | 120.6 |
N1—C1—S1 | 114.80 (9) | C2—C3—H3 | 120.6 |
C8—C1—S1 | 122.00 (8) | C5—C6—C7 | 117.51 (11) |
O2—C12—C11 | 125.61 (11) | C5—C6—H6 | 121.2 |
O2—C12—C13 | 114.48 (10) | C7—C6—H6 | 121.2 |
C11—C12—C13 | 119.91 (11) | C3—C4—C5 | 121.05 (12) |
C12—C11—C10 | 120.22 (11) | C3—C4—H4 | 119.5 |
C12—C11—H11 | 119.9 | C5—C4—H4 | 119.5 |
C10—C11—H11 | 119.9 | C14—C15—H15A | 109.5 |
N1—C2—C3 | 125.53 (10) | C14—C15—H15B | 109.5 |
N1—C2—C7 | 114.76 (10) | H15A—C15—H15B | 109.5 |
C3—C2—C7 | 119.71 (11) | C14—C15—H15C | 109.5 |
C6—C7—C2 | 121.56 (11) | H15A—C15—H15C | 109.5 |
C6—C7—S1 | 128.96 (9) | H15B—C15—H15C | 109.5 |
C2—C7—S1 | 109.48 (8) | C6—C5—C4 | 121.42 (12) |
C10—C9—C8 | 120.53 (11) | C6—C5—H5 | 119.3 |
C10—C9—H9 | 119.7 | C4—C5—H5 | 119.3 |
C8—C9—H9 | 119.7 | ||
C9—C8—C13—O1 | −178.87 (11) | C1—N1—C2—C3 | 178.53 (11) |
C1—C8—C13—O1 | 0.34 (17) | C1—N1—C2—C7 | −0.66 (14) |
C9—C8—C13—C12 | 0.68 (17) | N1—C2—C7—C6 | 179.82 (10) |
C1—C8—C13—C12 | 179.89 (10) | C3—C2—C7—C6 | 0.58 (17) |
C2—N1—C1—C8 | 179.89 (10) | N1—C2—C7—S1 | 0.53 (12) |
C2—N1—C1—S1 | 0.49 (13) | C3—C2—C7—S1 | −178.70 (9) |
C13—C8—C1—N1 | −3.48 (17) | C1—S1—C7—C6 | −179.43 (12) |
C9—C8—C1—N1 | 175.71 (11) | C1—S1—C7—C2 | −0.21 (8) |
C13—C8—C1—S1 | 175.88 (8) | C13—C8—C9—C10 | −0.23 (18) |
C9—C8—C1—S1 | −4.93 (16) | C1—C8—C9—C10 | −179.43 (11) |
C7—S1—C1—N1 | −0.16 (9) | C12—O2—C14—C15 | −178.61 (11) |
C7—S1—C1—C8 | −179.57 (10) | C8—C9—C10—C11 | −0.3 (2) |
C14—O2—C12—C11 | 1.21 (18) | C12—C11—C10—C9 | 0.4 (2) |
C14—O2—C12—C13 | −179.35 (10) | N1—C2—C3—C4 | −179.61 (11) |
O1—C13—C12—O2 | −0.50 (15) | C7—C2—C3—C4 | −0.46 (18) |
C8—C13—C12—O2 | 179.92 (10) | C2—C7—C6—C5 | −0.25 (18) |
O1—C13—C12—C11 | 178.97 (11) | S1—C7—C6—C5 | 178.88 (10) |
C8—C13—C12—C11 | −0.61 (17) | C2—C3—C4—C5 | 0.0 (2) |
O2—C12—C11—C10 | 179.49 (12) | C7—C6—C5—C4 | −0.2 (2) |
C13—C12—C11—C10 | 0.08 (18) | C3—C4—C5—C6 | 0.3 (2) |
Cg1 and Cg2 are the centroids of the C8–C13 and C2–C7 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1 | 0.82 | 1.90 | 2.626 (1) | 147 |
C14—H14A···Cg1i | 0.97 | 2.91 | 3.779 (1) | 149 |
C14—H14B···Cg2ii | 0.97 | 2.65 | 3.506 (1) | 148 |
Symmetry codes: (i) −x−1, −y, −z; (ii) −x, −y, −z. |
Experimental details
Crystal data | |
Chemical formula | C15H13NO2S |
Mr | 271.32 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 293 |
a, b, c (Å) | 9.8739 (5), 9.6222 (4), 13.3644 (6) |
β (°) | 95.269 (2) |
V (Å3) | 1264.37 (10) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.25 |
Crystal size (mm) | 0.24 × 0.22 × 0.16 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.941, 0.960 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 19076, 5191, 3449 |
Rint | 0.023 |
(sin θ/λ)max (Å−1) | 0.790 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.041, 0.125, 1.01 |
No. of reflections | 5191 |
No. of parameters | 173 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.36, −0.21 |
Computer programs: APEX2 (Bruker, 2004), APEX2 and SAINT (Bruker, 2004), SAINT and XPREP (Bruker, 2004), SHELXS97 (Sheldrick, 2008), ORTEP-3 (Farrugia (1997), SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).
Cg1 and Cg2 are the centroids of the C8–C13 and C2–C7 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N1 | 0.82 | 1.90 | 2.626 (1) | 147 |
C14—H14A···Cg1i | 0.97 | 2.91 | 3.779 (1) | 149 |
C14—H14B···Cg2ii | 0.97 | 2.65 | 3.506 (1) | 148 |
Symmetry codes: (i) −x−1, −y, −z; (ii) −x, −y, −z. |
Acknowledgements
SM thanks Dr Babu Vargheese, SAIF, IIT, Madras, India, for his help with the data collection.
References
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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.
Benzothiazole are remarkable heterocyclic ring systems. They possess therapeutic value, are synthetic intermediates in the preparation of medicinal compounds and find numerous applications in chemical industry (Bradshaw et al., 2002, Hutchinson et al., 2002, Delmas et al., 2002). Benzothiazole nucleus is associated with several pharmacological activities such as anti-tumor (Repiĉ et al., 2001) and antimicrobial (Schwartz et al., 1992). In view of this biological importance, the crystal structure of the title compound has been determined and the results are presented here.
Fig. 1. shows a displacement ellipsoid plot of (I), with the atom numbering scheme. The benzothiazole moiety (S1/N1/C1-C7) is essentially planar[maximum deviation = -0.0099 (5) Å for the S atom] and lies at an angle 4.8 (5)° with respect to the benzene ring. The geometric parameters of the title molecule agrees well with those reported for similar structures (Baryala et al., 2010, Zhang et al., 2008).
In addition to the van der Waals interaction, the crystal packing is stabilized by O-H···N and C-H···π hydrogen bonds. The intramolecular O1-H1···N1 hydrogen bond generates an S(6) ring motif (Bernstein et al., 1995). The crystal packing (Fig. 2) is stabilized by intermolecular C-H···π interactions, the first one between ethoxy group of atom H14A and the benene ring (C8-C13) (Table 1; C14-H14A···Cg1i, Cg1 is the centroid of the C8-C13 ring, symmetry code as in Fig. 2), and the second one between ethoxy group of atom H14B and the benzene ring (C2-C7) (Table 1; C14-H14B..Cg2ii, Cg2 is the centroid of the C2-C7 ring, symmetry code as in Fig. 2).