organic compounds
2-(2-Nitrophenyl)-1,3-benzothiazole
aDepartment of Physics, Sri Balaji Chokkalingam Engineering College, Arni, Thiruvannamalai 632 317, India, bDepartment of Physics, Thanthai Periyar Government Institute of Technology, Vellore 632 002, India, and cDepartment of Organic Chemistry, University of Madras, Maraimalai Campus, Chennai 600 025, India
*Correspondence e-mail: smurugavel27@gmail.com
In the title compound, C13H8N2O2S, the essentially planar benzothiazole system [maximum deviation = −0.012 (1) Å for the S atom] is oriented at a dihedral angle of 48.3 (1)° with respect to the benzene ring. The nitro group is substantially twisted from the plane of its attached benzene ring [dihedral angle = 52.0 (1)°]. The crystal packing features C—H⋯O hydrogen bonds, which generate C(6) helical chains propagating along [010]. Weak C—H⋯π interactions also occur in the crystal.
Related literature
For the pharmacological activity of benzothiazole derivatives, see: Repiĉ et al. (2001); Schwartz et al. (1992). For related structures, see: Lakshmanan et al. (2011); Zhang et al. (2008).
Experimental
Crystal data
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Refinement
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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
https://doi.org/10.1107/S1600536812029844/hb6879sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812029844/hb6879Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536812029844/hb6879Isup3.cml
A mixture of 2-nitrobenzaldehyde (1 g, 6.6 mmol), 2-aminobenzenethiol (0.827 g, 6.6 mmol) and bakers' yeast (2.05 g) were stirred at room temperature for 24 h in dichloro methane(DCM). After completion of the reaction, the bakers' yeast was filtered through a bed of Celite, and the filtrate was concentrated under reduced pressure. On cooling, the solid product (1.60 g, 94%) obtained was separated and crystallized from ethylacetate to afford the title compound as yellow blocks.
All the H atoms were positioned geometrically, with C–H = 0.93–0.96 Å and constrained to ride on their parent atom, with Uiso(H) = 1.2Ueq(C).
The benzothiazole nucleus is associated with several pharmacological activities such as anti-tumor (Repiĉ et al., 2001) and antimicrobial (Schwartz et al., 1992). As part of our studies in this area, the
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 = -0.012 (1) Å for the S atom] and lies at an angle 48.3 (1)° with respect to the benzene ring. The nitro group (N2/O1/O2) is twisted from the attached benzene ring, forming a dihedral angle of 52.0 (1)°. The geometric parameters of the title molecule agrees well with those reported for similar structures (Lakshmanan et al., 2011, Zhang et al., 2008).
The crystal packing features C—H···O hydrogen bonds. Atom C11 at x, y, z donates one proton to atom O1 at 1 - x, -1/2 + y, 3/2 - z, forming C(6) zigzag chains along the b axis (Fig. 2). The crystal packing also features three weak C—H···π interactions, the first one between a benzene H9 atom and the thiazole ring (S1/N1/C1/C2/C7) of an adjacent molecule, with a C9—H9···Cg1ii seperation of 2.92 Å, the second one between a benzene H10 atom and the benzene ring (C2–C7) of a neighbouring molecule, with a C10—H10···Cg2ii seperation of 2.90 Å and the third one between a benzene H3 atom and the benzene ring (C8–C13) of a neighbouring molecule, with a C3—H3···Cg3iii seperation of 2.99 Å (Table 1 and Fig. 3; Cg1, Cg2 and Cg3 are the centroids of the (S1/N1/C1/C2/C7) thiazole ring, (C2–C7) benzene ring and (C8–C13) benzene ring, respectively. symmetry code as in Fig. 3).
For the pharmacological activity of benzothiazole derivatives, see: Repiĉ et al. (2001); Schwartz et al. (1992). For related structures, see: Lakshmanan et al. (2011); Zhang et al. (2008).
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).Fig. 1. The molecular structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level. | |
Fig. 2. Part of the crystal structure of (I) showing intermolecular C—H···O hydrogen bonds (dotted lines), forming C(6) zigzag chains along the b axis. For clarity H atoms involved in the hydrogen bonds are shown. [Symmetry codes:(iv)1 - x, -1/2 + y, 3/2 - z; (v)x, -1 + y, z; (vi)1 - x, -3/2 + y, 3/2 - z; (vii)x, -2 + y, z]. | |
Fig. 3. A view of the C—H···π interactions (dotted lines) in the crystal structure of the title compound. Cg1, Cg2 and Cg3 denotes centroid of the S1/N1/C1/C2/C7 thiazole ring, C2–C7 benzene ring and C8–C13 benzene ring, respectively. [Symmetry codes: (ii)-x, -y, 1 - z; (iii)-x, 1/2 + y, 3/2 - z]. |
C13H8N2O2S | F(000) = 528 |
Mr = 256.27 | Dx = 1.459 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 3261 reflections |
a = 7.6092 (2) Å | θ = 2.3–29.5° |
b = 12.7854 (3) Å | µ = 0.27 mm−1 |
c = 11.9938 (3) Å | T = 293 K |
β = 90.556 (2)° | Block, yellow |
V = 1166.78 (5) Å3 | 0.24 × 0.22 × 0.16 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 3258 independent reflections |
Radiation source: fine-focus sealed tube | 2559 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.027 |
Detector resolution: 10.0 pixels mm-1 | θmax = 29.5°, θmin = 2.3° |
ω scans | h = −6→10 |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | k = −17→17 |
Tmin = 0.937, Tmax = 0.958 | l = −16→16 |
14037 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)] = 0.039 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.113 | H-atom parameters constrained |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0565P)2 + 0.2357P] where P = (Fo2 + 2Fc2)/3 |
3258 reflections | (Δ/σ)max < 0.001 |
163 parameters | Δρmax = 0.24 e Å−3 |
0 restraints | Δρmin = −0.32 e Å−3 |
C13H8N2O2S | V = 1166.78 (5) Å3 |
Mr = 256.27 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 7.6092 (2) Å | µ = 0.27 mm−1 |
b = 12.7854 (3) Å | T = 293 K |
c = 11.9938 (3) Å | 0.24 × 0.22 × 0.16 mm |
β = 90.556 (2)° |
Bruker APEXII CCD diffractometer | 3258 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 2559 reflections with I > 2σ(I) |
Tmin = 0.937, Tmax = 0.958 | Rint = 0.027 |
14037 measured reflections |
R[F2 > 2σ(F2)] = 0.039 | 0 restraints |
wR(F2) = 0.113 | H-atom parameters constrained |
S = 1.05 | Δρmax = 0.24 e Å−3 |
3258 reflections | Δρmin = −0.32 e Å−3 |
163 parameters |
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 | 0.23422 (17) | 0.05259 (10) | 0.59828 (11) | 0.0353 (3) | |
C2 | 0.16130 (18) | 0.21138 (10) | 0.64971 (11) | 0.0363 (3) | |
C3 | 0.0966 (2) | 0.29175 (12) | 0.71628 (13) | 0.0480 (3) | |
H3 | 0.0530 | 0.2776 | 0.7869 | 0.058* | |
C4 | 0.0984 (2) | 0.39208 (12) | 0.67587 (16) | 0.0548 (4) | |
H4 | 0.0561 | 0.4462 | 0.7199 | 0.066* | |
C5 | 0.1620 (2) | 0.41411 (12) | 0.57096 (16) | 0.0560 (4) | |
H5 | 0.1621 | 0.4830 | 0.5460 | 0.067* | |
C6 | 0.2249 (2) | 0.33699 (12) | 0.50273 (15) | 0.0531 (4) | |
H6 | 0.2667 | 0.3523 | 0.4320 | 0.064* | |
C7 | 0.22399 (19) | 0.23476 (11) | 0.54327 (12) | 0.0404 (3) | |
C8 | 0.26409 (17) | −0.06135 (10) | 0.60273 (11) | 0.0362 (3) | |
C9 | 0.2087 (2) | −0.12556 (11) | 0.51565 (13) | 0.0465 (3) | |
H9 | 0.1533 | −0.0963 | 0.4536 | 0.056* | |
C10 | 0.2349 (2) | −0.23238 (12) | 0.52027 (15) | 0.0542 (4) | |
H10 | 0.1979 | −0.2743 | 0.4612 | 0.065* | |
C11 | 0.3152 (2) | −0.27701 (11) | 0.61136 (16) | 0.0546 (4) | |
H11 | 0.3325 | −0.3490 | 0.6137 | 0.065* | |
C12 | 0.3705 (2) | −0.21558 (11) | 0.69957 (14) | 0.0470 (3) | |
H12 | 0.4235 | −0.2455 | 0.7621 | 0.056* | |
C13 | 0.34560 (18) | −0.10908 (10) | 0.69301 (11) | 0.0376 (3) | |
N1 | 0.16909 (16) | 0.10658 (8) | 0.67886 (9) | 0.0385 (3) | |
N2 | 0.42054 (19) | −0.04475 (10) | 0.78230 (11) | 0.0482 (3) | |
O1 | 0.51720 (18) | 0.02623 (10) | 0.75526 (12) | 0.0675 (4) | |
O2 | 0.3857 (2) | −0.06687 (13) | 0.87769 (10) | 0.0812 (4) | |
S1 | 0.29145 (6) | 0.12103 (3) | 0.47927 (3) | 0.04852 (13) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0351 (6) | 0.0335 (6) | 0.0372 (6) | 0.0036 (5) | −0.0008 (5) | 0.0019 (5) |
C2 | 0.0360 (7) | 0.0340 (6) | 0.0389 (6) | 0.0019 (5) | −0.0033 (5) | −0.0014 (5) |
C3 | 0.0543 (9) | 0.0430 (7) | 0.0469 (8) | 0.0053 (6) | 0.0005 (7) | −0.0092 (6) |
C4 | 0.0577 (10) | 0.0379 (7) | 0.0687 (10) | 0.0062 (7) | −0.0064 (8) | −0.0153 (7) |
C5 | 0.0586 (10) | 0.0316 (7) | 0.0776 (11) | −0.0010 (7) | −0.0063 (8) | 0.0036 (7) |
C6 | 0.0607 (10) | 0.0383 (8) | 0.0605 (9) | −0.0017 (7) | 0.0062 (8) | 0.0109 (7) |
C7 | 0.0416 (7) | 0.0338 (6) | 0.0459 (7) | 0.0012 (5) | 0.0020 (6) | 0.0019 (5) |
C8 | 0.0339 (6) | 0.0326 (6) | 0.0422 (7) | 0.0034 (5) | −0.0006 (5) | −0.0012 (5) |
C9 | 0.0464 (8) | 0.0423 (7) | 0.0506 (8) | 0.0074 (6) | −0.0117 (7) | −0.0064 (6) |
C10 | 0.0537 (9) | 0.0404 (8) | 0.0681 (11) | 0.0038 (7) | −0.0123 (8) | −0.0167 (7) |
C11 | 0.0561 (9) | 0.0309 (7) | 0.0766 (11) | 0.0033 (6) | −0.0052 (8) | −0.0038 (7) |
C12 | 0.0489 (8) | 0.0362 (7) | 0.0559 (8) | 0.0048 (6) | −0.0032 (7) | 0.0064 (6) |
C13 | 0.0373 (7) | 0.0336 (6) | 0.0417 (7) | 0.0013 (5) | −0.0006 (5) | −0.0005 (5) |
N1 | 0.0442 (6) | 0.0345 (5) | 0.0368 (5) | 0.0048 (4) | 0.0009 (5) | 0.0007 (4) |
N2 | 0.0552 (8) | 0.0416 (6) | 0.0476 (7) | 0.0074 (6) | −0.0130 (6) | −0.0025 (5) |
O1 | 0.0702 (8) | 0.0496 (7) | 0.0822 (9) | −0.0119 (6) | −0.0263 (7) | −0.0049 (6) |
O2 | 0.1183 (13) | 0.0836 (10) | 0.0414 (6) | 0.0026 (9) | −0.0075 (7) | −0.0013 (6) |
S1 | 0.0620 (3) | 0.0411 (2) | 0.0428 (2) | 0.00900 (16) | 0.01624 (17) | 0.00421 (14) |
C1—N1 | 1.2906 (17) | C7—S1 | 1.7247 (14) |
C1—C8 | 1.4752 (18) | C8—C13 | 1.3844 (19) |
C1—S1 | 1.7335 (13) | C8—C9 | 1.391 (2) |
C2—N1 | 1.3858 (17) | C9—C10 | 1.381 (2) |
C2—C3 | 1.3940 (19) | C9—H9 | 0.9300 |
C2—C7 | 1.400 (2) | C10—C11 | 1.371 (2) |
C3—C4 | 1.371 (2) | C10—H10 | 0.9300 |
C3—H3 | 0.9300 | C11—C12 | 1.380 (2) |
C4—C5 | 1.381 (3) | C11—H11 | 0.9300 |
C4—H4 | 0.9300 | C12—C13 | 1.3770 (18) |
C5—C6 | 1.371 (3) | C12—H12 | 0.9300 |
C5—H5 | 0.9300 | C13—N2 | 1.4617 (18) |
C6—C7 | 1.395 (2) | N2—O2 | 1.2103 (18) |
C6—H6 | 0.9300 | N2—O1 | 1.2142 (19) |
N1—C1—C8 | 124.15 (12) | C13—C8—C1 | 122.09 (12) |
N1—C1—S1 | 116.61 (10) | C9—C8—C1 | 120.68 (12) |
C8—C1—S1 | 119.24 (10) | C10—C9—C8 | 120.72 (14) |
N1—C2—C3 | 125.64 (13) | C10—C9—H9 | 119.6 |
N1—C2—C7 | 115.00 (11) | C8—C9—H9 | 119.6 |
C3—C2—C7 | 119.36 (13) | C11—C10—C9 | 120.44 (15) |
C4—C3—C2 | 118.84 (15) | C11—C10—H10 | 119.8 |
C4—C3—H3 | 120.6 | C9—C10—H10 | 119.8 |
C2—C3—H3 | 120.6 | C10—C11—C12 | 120.29 (14) |
C3—C4—C5 | 121.16 (15) | C10—C11—H11 | 119.9 |
C3—C4—H4 | 119.4 | C12—C11—H11 | 119.9 |
C5—C4—H4 | 119.4 | C13—C12—C11 | 118.56 (14) |
C6—C5—C4 | 121.63 (15) | C13—C12—H12 | 120.7 |
C6—C5—H5 | 119.2 | C11—C12—H12 | 120.7 |
C4—C5—H5 | 119.2 | C12—C13—C8 | 122.75 (13) |
C5—C6—C7 | 117.59 (16) | C12—C13—N2 | 117.52 (13) |
C5—C6—H6 | 121.2 | C8—C13—N2 | 119.58 (11) |
C7—C6—H6 | 121.2 | C1—N1—C2 | 110.13 (11) |
C6—C7—C2 | 121.41 (14) | O2—N2—O1 | 124.46 (15) |
C6—C7—S1 | 129.23 (12) | O2—N2—C13 | 118.28 (14) |
C2—C7—S1 | 109.36 (10) | O1—N2—C13 | 117.25 (13) |
C13—C8—C9 | 117.22 (12) | C7—S1—C1 | 88.91 (6) |
N1—C2—C3—C4 | 179.67 (15) | C10—C11—C12—C13 | −1.0 (3) |
C7—C2—C3—C4 | −0.8 (2) | C11—C12—C13—C8 | 1.4 (2) |
C2—C3—C4—C5 | 0.3 (3) | C11—C12—C13—N2 | −174.13 (15) |
C3—C4—C5—C6 | 0.4 (3) | C9—C8—C13—C12 | −0.9 (2) |
C4—C5—C6—C7 | −0.5 (3) | C1—C8—C13—C12 | 178.36 (14) |
C5—C6—C7—C2 | 0.0 (2) | C9—C8—C13—N2 | 174.55 (14) |
C5—C6—C7—S1 | 179.49 (13) | C1—C8—C13—N2 | −6.2 (2) |
N1—C2—C7—C6 | −179.77 (14) | C8—C1—N1—C2 | 178.70 (12) |
C3—C2—C7—C6 | 0.7 (2) | S1—C1—N1—C2 | −0.41 (15) |
N1—C2—C7—S1 | 0.64 (16) | C3—C2—N1—C1 | 179.35 (14) |
C3—C2—C7—S1 | −178.90 (11) | C7—C2—N1—C1 | −0.16 (17) |
N1—C1—C8—C13 | −47.3 (2) | C12—C13—N2—O2 | −52.8 (2) |
S1—C1—C8—C13 | 131.81 (12) | C8—C13—N2—O2 | 131.55 (16) |
N1—C1—C8—C9 | 131.96 (15) | C12—C13—N2—O1 | 125.64 (16) |
S1—C1—C8—C9 | −48.95 (18) | C8—C13—N2—O1 | −50.05 (19) |
C13—C8—C9—C10 | 0.0 (2) | C6—C7—S1—C1 | 179.76 (16) |
C1—C8—C9—C10 | −179.32 (14) | C2—C7—S1—C1 | −0.69 (11) |
C8—C9—C10—C11 | 0.4 (3) | N1—C1—S1—C7 | 0.67 (12) |
C9—C10—C11—C12 | 0.1 (3) | C8—C1—S1—C7 | −178.49 (11) |
D—H···A | D—H | H···A | D···A | D—H···A |
C11—H11···O1i | 0.93 | 2.51 | 3.236 (2) | 135 |
C9—H9···Cg1ii | 0.93 | 2.92 | 3.468 (2) | 119 |
C10—H10···Cg2ii | 0.93 | 2.90 | 3.536 (2) | 127 |
C3—H3···Cg3iii | 0.93 | 2.99 | 3.673 (2) | 132 |
Symmetry codes: (i) −x+1, y−1/2, −z+3/2; (ii) −x, −y, −z+1; (iii) −x, y+1/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | C13H8N2O2S |
Mr | 256.27 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 7.6092 (2), 12.7854 (3), 11.9938 (3) |
β (°) | 90.556 (2) |
V (Å3) | 1166.78 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.27 |
Crystal size (mm) | 0.24 × 0.22 × 0.16 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.937, 0.958 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14037, 3258, 2559 |
Rint | 0.027 |
(sin θ/λ)max (Å−1) | 0.693 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.039, 0.113, 1.05 |
No. of reflections | 3258 |
No. of parameters | 163 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.24, −0.32 |
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).
D—H···A | D—H | H···A | D···A | D—H···A |
C11—H11···O1i | 0.93 | 2.51 | 3.236 (2) | 135 |
C9—H9···Cg1ii | 0.93 | 2.92 | 3.468 (2) | 119 |
C10—H10···Cg2ii | 0.93 | 2.90 | 3.536 (2) | 127 |
C3—H3···Cg3iii | 0.93 | 2.99 | 3.673 (2) | 132 |
Symmetry codes: (i) −x+1, y−1/2, −z+3/2; (ii) −x, −y, −z+1; (iii) −x, y+1/2, −z+3/2. |
Footnotes
‡Additional correspondence author, e-mail: bhakthadoss@yahoo.com.
Acknowledgements
SM thank 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.
The benzothiazole nucleus is associated with several pharmacological activities such as anti-tumor (Repiĉ et al., 2001) and antimicrobial (Schwartz et al., 1992). As part of our studies in this area, 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 = -0.012 (1) Å for the S atom] and lies at an angle 48.3 (1)° with respect to the benzene ring. The nitro group (N2/O1/O2) is twisted from the attached benzene ring, forming a dihedral angle of 52.0 (1)°. The geometric parameters of the title molecule agrees well with those reported for similar structures (Lakshmanan et al., 2011, Zhang et al., 2008).
The crystal packing features C—H···O hydrogen bonds. Atom C11 at x, y, z donates one proton to atom O1 at 1 - x, -1/2 + y, 3/2 - z, forming C(6) zigzag chains along the b axis (Fig. 2). The crystal packing also features three weak C—H···π interactions, the first one between a benzene H9 atom and the thiazole ring (S1/N1/C1/C2/C7) of an adjacent molecule, with a C9—H9···Cg1ii seperation of 2.92 Å, the second one between a benzene H10 atom and the benzene ring (C2–C7) of a neighbouring molecule, with a C10—H10···Cg2ii seperation of 2.90 Å and the third one between a benzene H3 atom and the benzene ring (C8–C13) of a neighbouring molecule, with a C3—H3···Cg3iii seperation of 2.99 Å (Table 1 and Fig. 3; Cg1, Cg2 and Cg3 are the centroids of the (S1/N1/C1/C2/C7) thiazole ring, (C2–C7) benzene ring and (C8–C13) benzene ring, respectively. symmetry code as in Fig. 3).