organic compounds
2,4-Dichloro-N-(1,3-thiazol-2-yl)benzamide
aDepartment of Chemistry, Research Complex, Allama Iqbal Open University, Islamabad, Pakistan, and bDepartment of Chemistry, University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong SAR, People's Republic of China
*Correspondence e-mail: Sohail262001@yahoo.com
In the molecular structure of the title compound, C10H6Cl2N2OS, the dihedral angle between the benzene plane and the plane defined by the amide functionality is 8.6 (1)°, while the thiazole ring plane is twisted with respect to the amide plane by 68.71 (5)°. In the crystal, pairs of intermolecular N—H⋯N hydrogen-bond interactions connect the molecules into inversion dimers. π–π interactions are also observed between neighbouring thiazole and phenyl rings [centroid–centroid distance = 3.5905 (13) Å] and a weak C—H⋯π interaction also occurs.
Related literature
For the synthesis of related thiazole derivatives and their application, see: Raman et al. (2000); Yunus et al. (2007, 2008). For microwave-assisted synthesis of see Wang et al. (2008).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 1998); cell SAINT (Bruker, 2006); data reduction: SAINT and CrystalStructure (Rigaku/MSC, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPII (Johnson, 1976) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELX97.
Supporting information
https://doi.org/10.1107/S1600536810044193/im2236sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810044193/im2236Isup2.hkl
A mixture of 2,4-dichlorobenzoyl chloride (0.01 mol) and 2-aminothiazole (0.01 mol) was refluxed in acetone (50 ml) for 1.5 h. After cooling to room temperature, the mixture was poured into acidified cold water. The resulting solid was filtered and washed with cold acetone (yield: 72%). Single crystals of the title compound suitable for single-crystal X-ray analysis were obtained by recrystallization of the light yellow solid from ethyl acetate.
The structure was solved by
(SHELXS97) and expanded using Fourier techniques. All non-H atoms were refined anisotropically. C-bound H atoms are all placed geometrically C—H = 0.93 Å for phenyl H-atoms. They were refined using a riding model with Uiso(H) = 1.2 Ueq (Carrier). N-bound H atoms were located from difference Fourier map and are refined isotropically.Highest peak is 0.25 at (0.9753, 0.3236, 0.26385) [0.97Å from Cl2] Deepest hole is -0.24 at (0.2315, 0.6265, 0.1208) [0.79Å from Cl1]
Substituted and unsubstituted thiazole derivatives are of great importance in biological systems due to their vast range of biological activities such as anti-inflammatory, analgestic and antipyretic (Raman et al., 2000; Yunus et al., 2007, 2008). On the other hand, amide compounds have extensive applications in pharmaceutical industry (Wang et al., 2008).
The title compound, 2,4-dichloro-N-thiazol-2-yl-benzamide, C10H6Cl2N2OS, crystallizes in the monoclinic
P21/c (#14). The molecule is not planar showing a dihedral angle of 8.6 (1)° of the amide group, C3—C5/N2/O1 with respect to the phenyl ring plane, C5—C10/Cl1/Cl2. The thiazolyl ring, C1—C3/N1/S1, is twisted (68.71 (5)°) relative to the amide group. In additon, the phenyl ring plane makes a dihedral angle of 74.89 (5)° with the thiazole ring plane.There are pair-wise inter-molecular N2—H2N···N1 H-bond interactions linking the molecules into dimeric arrangements. There are also π–π interactions between neighbouring thiazole, S1/N1/C1—C3 (Cg1), and phenyl rings, C5—C10 (Cg2), in the The distance between ring centroids Cg1 and Cg2 is 3.5905 Å, and dihedral angle between them is determined to 0°.
There is no residual solvent accessible void volume in the unit cell.
For the synthesis of related thiazole derivatives and their application, see: Raman et al. (2000); Yunus et al. (2007, 2008). For microwave-assisted synthesis of
see Wang et al. (2008).Data collection: SMART (Bruker, 1998); cell
SAINT (Bruker, 2006); data reduction: SAINT (Bruker, 2006) and CrystalStructure (Rigaku/MSC, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPII (Johnson, 1976) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELX97 (Sheldrick, 2008).Fig. 1. ORTEP plot of the compound with thermal ellipsoids at the 50% probability level and showing the atom numbering scheme. | |
Fig. 2. Packing diagram. |
C10H6Cl2N2OS | F(000) = 552 |
Mr = 273.13 | Dx = 1.604 Mg m−3 |
Monoclinic, P21/c | Melting point: 487 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 14.054 (3) Å | Cell parameters from 6065 reflections |
b = 13.063 (3) Å | θ = 2.2–25.0° |
c = 6.2880 (14) Å | µ = 0.74 mm−1 |
β = 101.578 (3)° | T = 304 K |
V = 1130.8 (4) Å3 | Block, colourless |
Z = 4 | 0.38 × 0.27 × 0.07 mm |
Bruker SMART 1000 CCD diffractometer | 1993 independent reflections |
Radiation source: fine-focus sealed tube | 1820 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.014 |
ω scans | θmax = 25.0°, θmin = 2.2° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −16→15 |
Tmin = 0.768, Tmax = 0.950 | k = −15→13 |
5906 measured reflections | l = −6→7 |
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)] = 0.029 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.080 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0375P)2 + 0.4293P] where P = (Fo2 + 2Fc2)/3 |
1993 reflections | (Δ/σ)max < 0.001 |
149 parameters | Δρmax = 0.25 e Å−3 |
0 restraints | Δρmin = −0.24 e Å−3 |
C10H6Cl2N2OS | V = 1130.8 (4) Å3 |
Mr = 273.13 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 14.054 (3) Å | µ = 0.74 mm−1 |
b = 13.063 (3) Å | T = 304 K |
c = 6.2880 (14) Å | 0.38 × 0.27 × 0.07 mm |
β = 101.578 (3)° |
Bruker SMART 1000 CCD diffractometer | 1993 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 1820 reflections with I > 2σ(I) |
Tmin = 0.768, Tmax = 0.950 | Rint = 0.014 |
5906 measured reflections |
R[F2 > 2σ(F2)] = 0.029 | 0 restraints |
wR(F2) = 0.080 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.25 e Å−3 |
1993 reflections | Δρmin = −0.24 e Å−3 |
149 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 | ||
Cl1 | 0.24941 (4) | 0.64173 (4) | 0.24448 (11) | 0.0739 (2) | |
Cl2 | 0.02120 (5) | 0.61769 (6) | 0.82771 (11) | 0.0849 (2) | |
S1 | 0.41434 (3) | 0.32850 (4) | 0.00755 (7) | 0.04892 (15) | |
O1 | 0.25039 (10) | 0.34891 (11) | 0.1798 (2) | 0.0592 (4) | |
N1 | 0.53725 (10) | 0.42950 (11) | 0.2878 (2) | 0.0452 (3) | |
N2 | 0.38052 (10) | 0.43647 (12) | 0.3593 (3) | 0.0441 (3) | |
C1 | 0.53294 (15) | 0.33469 (15) | −0.0224 (3) | 0.0536 (5) | |
H1 | 0.5568 | 0.3037 | −0.1343 | 0.064* | |
C2 | 0.58651 (14) | 0.39011 (15) | 0.1371 (3) | 0.0500 (4) | |
H2 | 0.6525 | 0.4013 | 0.1457 | 0.060* | |
C3 | 0.44612 (12) | 0.40332 (12) | 0.2379 (3) | 0.0399 (4) | |
C4 | 0.28500 (12) | 0.41126 (13) | 0.3182 (3) | 0.0436 (4) | |
C5 | 0.22451 (12) | 0.46497 (13) | 0.4549 (3) | 0.0435 (4) | |
C6 | 0.20114 (12) | 0.56805 (14) | 0.4270 (3) | 0.0471 (4) | |
C7 | 0.13838 (13) | 0.61528 (15) | 0.5405 (3) | 0.0549 (5) | |
H7 | 0.1220 | 0.6839 | 0.5175 | 0.066* | |
C8 | 0.10102 (13) | 0.55811 (18) | 0.6880 (3) | 0.0571 (5) | |
C9 | 0.12440 (15) | 0.45612 (18) | 0.7240 (4) | 0.0637 (5) | |
H9 | 0.0997 | 0.4191 | 0.8271 | 0.076* | |
C10 | 0.18494 (14) | 0.40987 (16) | 0.6047 (3) | 0.0561 (5) | |
H10 | 0.1994 | 0.3407 | 0.6252 | 0.067* | |
H2N | 0.4017 (14) | 0.4739 (16) | 0.456 (3) | 0.048 (5)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0751 (4) | 0.0560 (3) | 0.1005 (5) | 0.0071 (3) | 0.0411 (3) | 0.0226 (3) |
Cl2 | 0.0658 (4) | 0.1064 (5) | 0.0910 (5) | 0.0030 (3) | 0.0361 (3) | −0.0242 (4) |
S1 | 0.0525 (3) | 0.0473 (3) | 0.0460 (3) | −0.00460 (19) | 0.0078 (2) | −0.01145 (19) |
O1 | 0.0506 (8) | 0.0593 (8) | 0.0655 (9) | −0.0091 (6) | 0.0061 (6) | −0.0187 (7) |
N1 | 0.0420 (8) | 0.0449 (8) | 0.0487 (8) | −0.0020 (6) | 0.0095 (6) | −0.0084 (6) |
N2 | 0.0398 (8) | 0.0430 (8) | 0.0485 (8) | −0.0022 (6) | 0.0064 (6) | −0.0130 (7) |
C1 | 0.0596 (11) | 0.0544 (11) | 0.0499 (10) | −0.0013 (9) | 0.0186 (9) | −0.0099 (8) |
C2 | 0.0471 (10) | 0.0517 (11) | 0.0540 (10) | −0.0015 (8) | 0.0168 (8) | −0.0067 (8) |
C3 | 0.0446 (9) | 0.0331 (8) | 0.0411 (9) | 0.0008 (7) | 0.0065 (7) | −0.0029 (7) |
C4 | 0.0424 (9) | 0.0385 (9) | 0.0479 (9) | −0.0003 (7) | 0.0042 (7) | −0.0012 (7) |
C5 | 0.0344 (8) | 0.0457 (9) | 0.0482 (9) | −0.0023 (7) | 0.0035 (7) | −0.0020 (7) |
C6 | 0.0399 (9) | 0.0460 (10) | 0.0555 (10) | −0.0028 (7) | 0.0098 (8) | −0.0009 (8) |
C7 | 0.0451 (10) | 0.0489 (11) | 0.0705 (13) | 0.0011 (8) | 0.0108 (9) | −0.0080 (9) |
C8 | 0.0402 (9) | 0.0740 (14) | 0.0580 (11) | −0.0009 (9) | 0.0123 (8) | −0.0108 (10) |
C9 | 0.0597 (12) | 0.0747 (15) | 0.0614 (12) | −0.0019 (11) | 0.0234 (10) | 0.0083 (11) |
C10 | 0.0534 (11) | 0.0518 (11) | 0.0635 (12) | 0.0001 (9) | 0.0123 (9) | 0.0086 (9) |
Cl1—C6 | 1.7370 (19) | C2—H2 | 0.9300 |
Cl2—C8 | 1.741 (2) | C4—C5 | 1.499 (2) |
S1—C1 | 1.716 (2) | C5—C10 | 1.387 (3) |
S1—C3 | 1.7299 (16) | C5—C6 | 1.389 (3) |
O1—C4 | 1.219 (2) | C6—C7 | 1.386 (3) |
N1—C3 | 1.302 (2) | C7—C8 | 1.374 (3) |
N1—C2 | 1.381 (2) | C7—H7 | 0.9300 |
N2—C4 | 1.356 (2) | C8—C9 | 1.380 (3) |
N2—C3 | 1.379 (2) | C9—C10 | 1.381 (3) |
N2—H2N | 0.79 (2) | C9—H9 | 0.9300 |
C1—C2 | 1.339 (3) | C10—H10 | 0.9300 |
C1—H1 | 0.9300 | ||
C1—S1—C3 | 88.40 (9) | C10—C5—C4 | 119.82 (16) |
C3—N1—C2 | 109.94 (15) | C6—C5—C4 | 121.89 (16) |
C4—N2—C3 | 124.36 (15) | C7—C6—C5 | 121.70 (17) |
C4—N2—H2N | 120.1 (14) | C7—C6—Cl1 | 117.84 (15) |
C3—N2—H2N | 115.5 (14) | C5—C6—Cl1 | 120.46 (14) |
C2—C1—S1 | 110.84 (14) | C8—C7—C6 | 118.32 (19) |
C2—C1—H1 | 124.6 | C8—C7—H7 | 120.8 |
S1—C1—H1 | 124.6 | C6—C7—H7 | 120.8 |
C1—C2—N1 | 115.56 (17) | C7—C8—C9 | 121.65 (19) |
C1—C2—H2 | 122.2 | C7—C8—Cl2 | 118.02 (17) |
N1—C2—H2 | 122.2 | C9—C8—Cl2 | 120.32 (17) |
N1—C3—N2 | 121.23 (15) | C8—C9—C10 | 119.04 (19) |
N1—C3—S1 | 115.25 (13) | C8—C9—H9 | 120.5 |
N2—C3—S1 | 123.49 (13) | C10—C9—H9 | 120.5 |
O1—C4—N2 | 122.43 (17) | C9—C10—C5 | 121.08 (19) |
O1—C4—C5 | 122.07 (15) | C9—C10—H10 | 119.5 |
N2—C4—C5 | 115.51 (15) | C5—C10—H10 | 119.5 |
C10—C5—C6 | 118.16 (17) |
Cg1 is the centroid of the thiazole ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2N···N1i | 0.79 (2) | 2.09 (2) | 2.880 (2) | 178 (2) |
C1—H1···Cg1ii | 0.93 | 2.81 | 3.501 (2) | 132 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x, −y+1/2, z−1/2. |
Experimental details
Crystal data | |
Chemical formula | C10H6Cl2N2OS |
Mr | 273.13 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 304 |
a, b, c (Å) | 14.054 (3), 13.063 (3), 6.2880 (14) |
β (°) | 101.578 (3) |
V (Å3) | 1130.8 (4) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.74 |
Crystal size (mm) | 0.38 × 0.27 × 0.07 |
Data collection | |
Diffractometer | Bruker SMART 1000 CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.768, 0.950 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5906, 1993, 1820 |
Rint | 0.014 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.029, 0.080, 1.06 |
No. of reflections | 1993 |
No. of parameters | 149 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.25, −0.24 |
Computer programs: SMART (Bruker, 1998), SAINT (Bruker, 2006) and CrystalStructure (Rigaku/MSC, 2006), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEPII (Johnson, 1976) and Mercury (Macrae et al., 2008), SHELX97 (Sheldrick, 2008).
Cg1 is the centroid of the thiazole ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2N···N1i | 0.79 (2) | 2.09 (2) | 2.880 (2) | 178 (2) |
C1—H1···Cg1ii | 0.93 | 2.81 | 3.501 (2) | 132 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x, −y+1/2, z−1/2. |
Acknowledgements
The authors are grateful to the Department of Chemistry, Research Complex, Allama Iqbal Open University, Islamabad and the University of Hong Kong, Pokfulam, Hong Kong SAR, People's Republic of China for providing the laboratory and analytical facilities.
References
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Substituted and unsubstituted thiazole derivatives are of great importance in biological systems due to their vast range of biological activities such as anti-inflammatory, analgestic and antipyretic (Raman et al., 2000; Yunus et al., 2007, 2008). On the other hand, amide compounds have extensive applications in pharmaceutical industry (Wang et al., 2008).
The title compound, 2,4-dichloro-N-thiazol-2-yl-benzamide, C10H6Cl2N2OS, crystallizes in the monoclinic space group P21/c (#14). The molecule is not planar showing a dihedral angle of 8.6 (1)° of the amide group, C3—C5/N2/O1 with respect to the phenyl ring plane, C5—C10/Cl1/Cl2. The thiazolyl ring, C1—C3/N1/S1, is twisted (68.71 (5)°) relative to the amide group. In additon, the phenyl ring plane makes a dihedral angle of 74.89 (5)° with the thiazole ring plane.
There are pair-wise inter-molecular N2—H2N···N1 H-bond interactions linking the molecules into dimeric arrangements. There are also π–π interactions between neighbouring thiazole, S1/N1/C1—C3 (Cg1), and phenyl rings, C5—C10 (Cg2), in the crystal lattice. The distance between ring centroids Cg1 and Cg2 is 3.5905 Å, and dihedral angle between them is determined to 0°.
There is no residual solvent accessible void volume in the unit cell.