organic compounds
2-(6-Phenyl-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazin-3-yl)-1,3-benzothiazole
aDepartment of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia, bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia, and cChemistry Department, Faculty of, Science, King Abdulaziz University, PO Box 80203 Jeddah, Saudi Arabia
*Correspondence e-mail: Edward.Tiekink@gmail.com
In the title compound, C17H11N5S2, the dihedral angles formed between the triazole ring and the benzene ring and the 1,3-benzothiazole ring system are 8.67 (8) and 13.90 (9)°, respectively. The conformation of the triazolo-thiadiazin-3-yl fused ring system is a twisted half-chair. Overall, the molecule adopts a flattened shape. Supramolecular helical chains along the a axis sustained by C—H⋯N interactions are found in the These are linked via C—H⋯π contacts as well as π–π [centroid–centroid distance = 3.5911 (12) Å] interactions between the triazole and thiazole rings.
Related literature
For background to the synthesis and biological activity of benzothiazoles and [1,2,4]triazolo[3,4-b][1,3,4]thiadiazines, see: Abdel-Aziz et al. (2007, 2010); Dawood et al. (2005).
Experimental
Crystal data
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Data collection: CrysAlis PRO (Agilent, 2010); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
https://doi.org/10.1107/S1600536811036452/hg5092sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811036452/hg5092Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811036452/hg5092Isup3.cml
The title compound was prepared according to the reported method (Abdel-Aziz et al., 2007). Colourless crystals were obtained from an EtOH/DMF (v/v = 2/1) solution by slow evaporation at room temperature.
Carbon-bound H-atoms were placed in calculated positions [C—H 0.95 to 0.99 Å, Uiso(H) 1.2Ueq(C)] and were included in the
in the riding model approximation.The title compound, (I), was investigated in relation to the established biological activities exhibited by benzothiazoles and [1,2,4]triazolo[3,4-b][1,3,4]thiadiazines (Abdel-Aziz et al. 2007; Abdel-Aziz et al. 2010; Dawood et al. 2005).
In (I), Fig. 1, the 1,3-benzothiazole ring is planar with r.m.s. deviations of 0.034 Å. By contrast, the triazolo-thiadiazin-3-yl fused ring system has a twisted half-chair form owing to the presence of the methylene-C10 group with the C10 atom lying 0.702 (3) Å out of the least-squares plane defined by the S2,N4,N5,C9,C11 atoms (r.m.s. deviation = 0.109 Å). The 1,3-benzothiazole ring forms dihedral angles of 13.90 (9) and 8.67 (8) °, respectively, with the triazole and benzene rings so that the entire molecule has a flattened shape.
In the crystal packing, C—H···N interactions, Table 1, lead to the formation of supramolecular chains along the a axis with an helical topology, Fig. 2. These assemble into zigzag layers in the ac plane with connections between them of the type C—H···π involving a methylene-H and the benzene ring, and π···π. The shortest interaction of the latter type of 3.5911 (12) Å occurs between the S1,N1,C1,C6,C7 and N2–N4,C8,C9 five-membered rings, Fig. 3.
For background to the synthesis and biological activity of benzothiazoles and [1,2,4]triazolo[3,4-b][1,3,4]thiadiazines, see: Abdel-Aziz et al. (2007, 2010); Dawood et al. (2005).
Data collection: CrysAlis PRO (Agilent, 2010); cell
CrysAlis PRO (Agilent, 2010); data reduction: CrysAlis PRO (Agilent, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).C17H11N5S2 | F(000) = 720 |
Mr = 349.43 | Dx = 1.549 Mg m−3 |
Orthorhombic, P21212 | Cu Kα radiation, λ = 1.5418 Å |
Hall symbol: P 2 2ab | Cell parameters from 3513 reflections |
a = 12.1437 (3) Å | θ = 3.6–74.3° |
b = 21.2950 (5) Å | µ = 3.29 mm−1 |
c = 5.7946 (1) Å | T = 100 K |
V = 1498.48 (6) Å3 | Plate, light-brown |
Z = 4 | 0.25 × 0.25 × 0.05 mm |
Agilent SuperNova Dual diffractometer with Atlas detector | 2902 independent reflections |
Radiation source: SuperNova (Cu) X-ray Source | 2751 reflections with I > 2σ(I) |
Mirror monochromator | Rint = 0.029 |
Detector resolution: 10.4041 pixels mm-1 | θmax = 74.5°, θmin = 4.2° |
ω scan | h = −15→13 |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010) | k = −13→26 |
Tmin = 0.715, Tmax = 1.000 | l = −6→6 |
5754 measured reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.032 | H-atom parameters constrained |
wR(F2) = 0.083 | w = 1/[σ2(Fo2) + (0.0507P)2 + 0.021P] where P = (Fo2 + 2Fc2)/3 |
S = 1.06 | (Δ/σ)max = 0.001 |
2902 reflections | Δρmax = 0.21 e Å−3 |
217 parameters | Δρmin = −0.30 e Å−3 |
0 restraints | Absolute structure: Flack (1983), 1150 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: −0.006 (16) |
C17H11N5S2 | V = 1498.48 (6) Å3 |
Mr = 349.43 | Z = 4 |
Orthorhombic, P21212 | Cu Kα radiation |
a = 12.1437 (3) Å | µ = 3.29 mm−1 |
b = 21.2950 (5) Å | T = 100 K |
c = 5.7946 (1) Å | 0.25 × 0.25 × 0.05 mm |
Agilent SuperNova Dual diffractometer with Atlas detector | 2902 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010) | 2751 reflections with I > 2σ(I) |
Tmin = 0.715, Tmax = 1.000 | Rint = 0.029 |
5754 measured reflections |
R[F2 > 2σ(F2)] = 0.032 | H-atom parameters constrained |
wR(F2) = 0.083 | Δρmax = 0.21 e Å−3 |
S = 1.06 | Δρmin = −0.30 e Å−3 |
2902 reflections | Absolute structure: Flack (1983), 1150 Friedel pairs |
217 parameters | Absolute structure parameter: −0.006 (16) |
0 restraints |
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 | 0.41692 (4) | 0.42415 (2) | 0.72377 (10) | 0.01863 (14) | |
S2 | 0.51497 (4) | 0.25815 (2) | 1.48903 (10) | 0.01803 (13) | |
N1 | 0.21298 (15) | 0.38633 (8) | 0.7555 (3) | 0.0165 (4) | |
N2 | 0.24914 (15) | 0.31575 (9) | 1.1796 (3) | 0.0170 (4) | |
N3 | 0.30068 (16) | 0.28150 (8) | 1.3539 (3) | 0.0177 (4) | |
N4 | 0.42913 (15) | 0.32303 (8) | 1.1339 (3) | 0.0142 (4) | |
N5 | 0.52940 (15) | 0.34569 (8) | 1.0531 (3) | 0.0155 (4) | |
C1 | 0.32276 (18) | 0.45294 (9) | 0.5251 (4) | 0.0173 (4) | |
C2 | 0.34046 (19) | 0.49351 (11) | 0.3396 (4) | 0.0214 (5) | |
H2 | 0.4105 | 0.5121 | 0.3138 | 0.026* | |
C3 | 0.25298 (18) | 0.50565 (10) | 0.1955 (4) | 0.0204 (5) | |
H3 | 0.2635 | 0.5325 | 0.0664 | 0.024* | |
C4 | 0.14936 (18) | 0.47958 (9) | 0.2342 (4) | 0.0202 (5) | |
H4 | 0.0908 | 0.4887 | 0.1309 | 0.024* | |
C5 | 0.13077 (18) | 0.44076 (10) | 0.4203 (4) | 0.0191 (5) | |
H5 | 0.0597 | 0.4237 | 0.4478 | 0.023* | |
C6 | 0.21838 (18) | 0.42704 (9) | 0.5676 (4) | 0.0149 (4) | |
C7 | 0.30956 (18) | 0.38046 (9) | 0.8490 (4) | 0.0139 (4) | |
C8 | 0.32714 (17) | 0.34057 (9) | 1.0515 (4) | 0.0149 (4) | |
C9 | 0.40792 (19) | 0.28660 (9) | 1.3227 (4) | 0.0153 (4) | |
C10 | 0.61131 (16) | 0.25386 (9) | 1.2505 (4) | 0.0175 (4) | |
H10A | 0.6859 | 0.2451 | 1.3118 | 0.021* | |
H10B | 0.5904 | 0.2184 | 1.1489 | 0.021* | |
C11 | 0.61482 (18) | 0.31330 (9) | 1.1098 (4) | 0.0143 (4) | |
C12 | 0.72157 (16) | 0.33574 (8) | 1.0201 (4) | 0.0140 (4) | |
C13 | 0.72667 (19) | 0.36733 (9) | 0.8082 (4) | 0.0171 (4) | |
H13 | 0.6617 | 0.3728 | 0.7193 | 0.021* | |
C14 | 0.82592 (18) | 0.39051 (9) | 0.7279 (4) | 0.0180 (4) | |
H14 | 0.8288 | 0.4122 | 0.5846 | 0.022* | |
C15 | 0.92123 (19) | 0.38220 (10) | 0.8562 (4) | 0.0186 (4) | |
H15 | 0.9891 | 0.3985 | 0.8010 | 0.022* | |
C16 | 0.91816 (19) | 0.35013 (10) | 1.0651 (4) | 0.0184 (4) | |
H16 | 0.9838 | 0.3443 | 1.1518 | 0.022* | |
C17 | 0.81865 (18) | 0.32671 (9) | 1.1466 (4) | 0.0159 (4) | |
H17 | 0.8164 | 0.3045 | 1.2886 | 0.019* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0133 (2) | 0.0176 (2) | 0.0250 (3) | −0.00121 (19) | −0.0008 (2) | 0.0079 (2) |
S2 | 0.0186 (3) | 0.0185 (3) | 0.0170 (3) | 0.00037 (19) | −0.0012 (2) | 0.00396 (19) |
N1 | 0.0172 (9) | 0.0139 (8) | 0.0184 (9) | −0.0010 (7) | −0.0006 (8) | 0.0007 (8) |
N2 | 0.0168 (9) | 0.0155 (8) | 0.0186 (9) | −0.0002 (7) | 0.0009 (8) | 0.0010 (7) |
N3 | 0.0185 (9) | 0.0171 (9) | 0.0175 (10) | −0.0008 (7) | 0.0015 (7) | 0.0035 (7) |
N4 | 0.0129 (9) | 0.0131 (8) | 0.0167 (9) | −0.0003 (7) | −0.0003 (7) | 0.0014 (7) |
N5 | 0.0134 (9) | 0.0136 (8) | 0.0195 (10) | −0.0017 (7) | 0.0019 (7) | 0.0015 (7) |
C1 | 0.0158 (10) | 0.0138 (9) | 0.0224 (11) | 0.0024 (8) | 0.0009 (9) | 0.0014 (9) |
C2 | 0.0168 (11) | 0.0181 (10) | 0.0295 (13) | −0.0004 (9) | 0.0018 (10) | 0.0066 (9) |
C3 | 0.0231 (12) | 0.0158 (10) | 0.0223 (11) | 0.0039 (9) | 0.0017 (10) | 0.0065 (9) |
C4 | 0.0201 (11) | 0.0195 (10) | 0.0211 (12) | 0.0042 (8) | −0.0038 (10) | 0.0012 (9) |
C5 | 0.0139 (11) | 0.0198 (10) | 0.0237 (12) | 0.0009 (8) | −0.0021 (9) | 0.0014 (9) |
C6 | 0.0173 (11) | 0.0118 (8) | 0.0157 (10) | 0.0011 (8) | 0.0013 (8) | −0.0008 (8) |
C7 | 0.0137 (9) | 0.0105 (9) | 0.0175 (11) | −0.0002 (8) | 0.0008 (8) | −0.0011 (8) |
C8 | 0.0127 (10) | 0.0138 (9) | 0.0183 (11) | 0.0017 (8) | −0.0010 (8) | −0.0012 (8) |
C9 | 0.0176 (10) | 0.0121 (9) | 0.0161 (10) | 0.0003 (8) | 0.0001 (8) | 0.0004 (7) |
C10 | 0.0139 (9) | 0.0134 (9) | 0.0252 (11) | 0.0001 (8) | −0.0016 (9) | 0.0024 (9) |
C11 | 0.0145 (10) | 0.0122 (9) | 0.0161 (10) | −0.0022 (8) | −0.0012 (8) | −0.0024 (8) |
C12 | 0.0143 (10) | 0.0093 (8) | 0.0184 (10) | −0.0001 (7) | −0.0001 (8) | −0.0015 (8) |
C13 | 0.0199 (11) | 0.0124 (9) | 0.0191 (11) | −0.0002 (8) | −0.0015 (9) | 0.0005 (8) |
C14 | 0.0218 (11) | 0.0159 (9) | 0.0161 (11) | 0.0000 (8) | 0.0033 (9) | 0.0007 (9) |
C15 | 0.0160 (10) | 0.0180 (10) | 0.0219 (11) | −0.0031 (9) | 0.0039 (9) | −0.0027 (9) |
C16 | 0.0161 (10) | 0.0169 (9) | 0.0221 (12) | 0.0003 (8) | −0.0015 (9) | −0.0010 (8) |
C17 | 0.0175 (11) | 0.0123 (9) | 0.0177 (11) | 0.0013 (8) | −0.0017 (9) | −0.0002 (8) |
S1—C1 | 1.734 (2) | C4—H4 | 0.9500 |
S1—C7 | 1.758 (2) | C5—C6 | 1.395 (3) |
S2—C9 | 1.728 (2) | C5—H5 | 0.9500 |
S2—C10 | 1.813 (2) | C7—C8 | 1.464 (3) |
N1—C7 | 1.298 (3) | C10—C11 | 1.507 (3) |
N1—C6 | 1.393 (3) | C10—H10A | 0.9900 |
N2—C8 | 1.314 (3) | C10—H10B | 0.9900 |
N2—N3 | 1.394 (3) | C11—C12 | 1.476 (3) |
N3—C9 | 1.319 (3) | C12—C13 | 1.402 (3) |
N4—C9 | 1.366 (3) | C12—C17 | 1.401 (3) |
N4—C8 | 1.379 (3) | C13—C14 | 1.383 (3) |
N4—N5 | 1.391 (2) | C13—H13 | 0.9500 |
N5—C11 | 1.288 (3) | C14—C15 | 1.387 (3) |
C1—C2 | 1.396 (3) | C14—H14 | 0.9500 |
C1—C6 | 1.404 (3) | C15—C16 | 1.391 (3) |
C2—C3 | 1.376 (3) | C15—H15 | 0.9500 |
C2—H2 | 0.9500 | C16—C17 | 1.390 (3) |
C3—C4 | 1.394 (3) | C16—H16 | 0.9500 |
C3—H3 | 0.9500 | C17—H17 | 0.9500 |
C4—C5 | 1.377 (3) | ||
C1—S1—C7 | 88.40 (10) | N4—C8—C7 | 124.43 (19) |
C9—S2—C10 | 94.47 (10) | N3—C9—N4 | 110.04 (19) |
C7—N1—C6 | 110.09 (18) | N3—C9—S2 | 129.60 (17) |
C8—N2—N3 | 107.21 (18) | N4—C9—S2 | 120.26 (17) |
C9—N3—N2 | 107.51 (17) | C11—C10—S2 | 112.86 (14) |
C9—N4—C8 | 105.17 (18) | C11—C10—H10A | 109.0 |
C9—N4—N5 | 129.18 (19) | S2—C10—H10A | 109.0 |
C8—N4—N5 | 125.17 (17) | C11—C10—H10B | 109.0 |
C11—N5—N4 | 115.69 (17) | S2—C10—H10B | 109.0 |
C2—C1—C6 | 121.1 (2) | H10A—C10—H10B | 107.8 |
C2—C1—S1 | 128.93 (17) | N5—C11—C12 | 116.37 (18) |
C6—C1—S1 | 109.87 (16) | N5—C11—C10 | 124.40 (19) |
C3—C2—C1 | 117.7 (2) | C12—C11—C10 | 119.17 (18) |
C3—C2—H2 | 121.1 | C13—C12—C17 | 119.1 (2) |
C1—C2—H2 | 121.1 | C13—C12—C11 | 120.2 (2) |
C2—C3—C4 | 121.6 (2) | C17—C12—C11 | 120.7 (2) |
C2—C3—H3 | 119.2 | C14—C13—C12 | 120.3 (2) |
C4—C3—H3 | 119.2 | C14—C13—H13 | 119.8 |
C5—C4—C3 | 120.9 (2) | C12—C13—H13 | 119.8 |
C5—C4—H4 | 119.6 | C13—C14—C15 | 120.1 (2) |
C3—C4—H4 | 119.6 | C13—C14—H14 | 120.0 |
C4—C5—C6 | 118.7 (2) | C15—C14—H14 | 120.0 |
C4—C5—H5 | 120.7 | C14—C15—C16 | 120.5 (2) |
C6—C5—H5 | 120.7 | C14—C15—H15 | 119.8 |
C5—C6—N1 | 124.9 (2) | C16—C15—H15 | 119.8 |
C5—C6—C1 | 119.93 (19) | C17—C16—C15 | 119.7 (2) |
N1—C6—C1 | 115.08 (19) | C17—C16—H16 | 120.2 |
N1—C7—C8 | 121.47 (19) | C15—C16—H16 | 120.2 |
N1—C7—S1 | 116.54 (16) | C16—C17—C12 | 120.3 (2) |
C8—C7—S1 | 121.97 (16) | C16—C17—H17 | 119.8 |
N2—C8—N4 | 110.06 (18) | C12—C17—H17 | 119.8 |
N2—C8—C7 | 125.50 (19) | ||
C8—N2—N3—C9 | −0.5 (2) | S1—C7—C8—N2 | 166.92 (17) |
C9—N4—N5—C11 | 25.6 (3) | N1—C7—C8—N4 | 167.6 (2) |
C8—N4—N5—C11 | −163.6 (2) | S1—C7—C8—N4 | −13.8 (3) |
C7—S1—C1—C2 | −177.9 (2) | N2—N3—C9—N4 | 0.0 (2) |
C7—S1—C1—C6 | −0.48 (16) | N2—N3—C9—S2 | 176.46 (16) |
C6—C1—C2—C3 | −2.0 (3) | C8—N4—C9—N3 | 0.5 (2) |
S1—C1—C2—C3 | 175.07 (18) | N5—N4—C9—N3 | 172.72 (19) |
C1—C2—C3—C4 | 1.2 (4) | C8—N4—C9—S2 | −176.35 (15) |
C2—C3—C4—C5 | 0.4 (4) | N5—N4—C9—S2 | −4.1 (3) |
C3—C4—C5—C6 | −1.2 (3) | C10—S2—C9—N3 | 153.5 (2) |
C4—C5—C6—N1 | −176.8 (2) | C10—S2—C9—N4 | −30.35 (18) |
C4—C5—C6—C1 | 0.3 (3) | C9—S2—C10—C11 | 48.76 (17) |
C7—N1—C6—C5 | 176.0 (2) | N4—N5—C11—C12 | 178.39 (18) |
C7—N1—C6—C1 | −1.3 (3) | N4—N5—C11—C10 | 1.0 (3) |
C2—C1—C6—C5 | 1.3 (3) | S2—C10—C11—N5 | −41.2 (3) |
S1—C1—C6—C5 | −176.30 (16) | S2—C10—C11—C12 | 141.45 (17) |
C2—C1—C6—N1 | 178.7 (2) | N5—C11—C12—C13 | −30.4 (3) |
S1—C1—C6—N1 | 1.1 (2) | C10—C11—C12—C13 | 147.11 (19) |
C6—N1—C7—C8 | 179.56 (17) | N5—C11—C12—C17 | 148.6 (2) |
C6—N1—C7—S1 | 0.9 (2) | C10—C11—C12—C17 | −33.9 (3) |
C1—S1—C7—N1 | −0.26 (18) | C17—C12—C13—C14 | −1.5 (3) |
C1—S1—C7—C8 | −178.90 (18) | C11—C12—C13—C14 | 177.53 (19) |
N3—N2—C8—N4 | 0.9 (2) | C12—C13—C14—C15 | 0.5 (3) |
N3—N2—C8—C7 | −179.81 (18) | C13—C14—C15—C16 | 0.6 (3) |
C9—N4—C8—N2 | −0.8 (2) | C14—C15—C16—C17 | −0.5 (3) |
N5—N4—C8—N2 | −173.48 (19) | C15—C16—C17—C12 | −0.5 (3) |
C9—N4—C8—C7 | 179.81 (18) | C13—C12—C17—C16 | 1.5 (3) |
N5—N4—C8—C7 | 7.2 (3) | C11—C12—C17—C16 | −177.49 (19) |
N1—C7—C8—N2 | −11.7 (3) |
Cg1 is the centroid of the C12–C17 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C10—H10a···N3i | 0.99 | 2.45 | 3.333 (3) | 148 |
C3—H3···Cg1ii | 0.95 | 2.65 | 3.377 (2) | 134 |
Symmetry codes: (i) x+1/2, −y+1/2, −z+3; (ii) −x+1, −y+1, z−1. |
Experimental details
Crystal data | |
Chemical formula | C17H11N5S2 |
Mr | 349.43 |
Crystal system, space group | Orthorhombic, P21212 |
Temperature (K) | 100 |
a, b, c (Å) | 12.1437 (3), 21.2950 (5), 5.7946 (1) |
V (Å3) | 1498.48 (6) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 3.29 |
Crystal size (mm) | 0.25 × 0.25 × 0.05 |
Data collection | |
Diffractometer | Agilent SuperNova Dual diffractometer with Atlas detector |
Absorption correction | Multi-scan (CrysAlis PRO; Agilent, 2010) |
Tmin, Tmax | 0.715, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5754, 2902, 2751 |
Rint | 0.029 |
(sin θ/λ)max (Å−1) | 0.625 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.032, 0.083, 1.06 |
No. of reflections | 2902 |
No. of parameters | 217 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.21, −0.30 |
Absolute structure | Flack (1983), 1150 Friedel pairs |
Absolute structure parameter | −0.006 (16) |
Computer programs: CrysAlis PRO (Agilent, 2010), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006), publCIF (Westrip, 2010).
Cg1 is the centroid of the C12–C17 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C10—H10a···N3i | 0.99 | 2.45 | 3.333 (3) | 148 |
C3—H3···Cg1ii | 0.95 | 2.65 | 3.377 (2) | 134 |
Symmetry codes: (i) x+1/2, −y+1/2, −z+3; (ii) −x+1, −y+1, z−1. |
Footnotes
‡Additional correspondence author: hatem_741@yahoo.com.
Acknowledgements
The authors thank King Saud University and the University of Malaya for supporting this study.
References
Abdel-Aziz, H. A., Abdel-Wahab, B. F. & Badria, F. A. (2010). Arch. Pharm. 343, 152–159. Google Scholar
Abdel-Aziz, H. A., Hamdy, N. A., Farag, A. M. & Fakhr, I. M. I. (2007). J. Chin. Chem. Soc. 54, 1573–1582. CAS Google Scholar
Agilent (2010). CrysAlis PRO. Agilent Technologies, Yarnton, England. Google Scholar
Brandenburg, K. (2006). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Dawood, K. M., Farag, A. M. & Abdel-Aziz, H. A. (2005). Heteroat. Chem, 16, 621–627. Web of Science CrossRef CAS Google Scholar
Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565. CrossRef IUCr Journals Google Scholar
Flack, H. D. (1983). Acta Cryst. A39, 876–881. CrossRef CAS Web of Science IUCr Journals Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Westrip, S. P. (2010). J. Appl. Cryst. 43, 920–925. Web of Science CrossRef CAS IUCr Journals Google Scholar
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 title compound, (I), was investigated in relation to the established biological activities exhibited by benzothiazoles and [1,2,4]triazolo[3,4-b][1,3,4]thiadiazines (Abdel-Aziz et al. 2007; Abdel-Aziz et al. 2010; Dawood et al. 2005).
In (I), Fig. 1, the 1,3-benzothiazole ring is planar with r.m.s. deviations of 0.034 Å. By contrast, the triazolo-thiadiazin-3-yl fused ring system has a twisted half-chair form owing to the presence of the methylene-C10 group with the C10 atom lying 0.702 (3) Å out of the least-squares plane defined by the S2,N4,N5,C9,C11 atoms (r.m.s. deviation = 0.109 Å). The 1,3-benzothiazole ring forms dihedral angles of 13.90 (9) and 8.67 (8) °, respectively, with the triazole and benzene rings so that the entire molecule has a flattened shape.
In the crystal packing, C—H···N interactions, Table 1, lead to the formation of supramolecular chains along the a axis with an helical topology, Fig. 2. These assemble into zigzag layers in the ac plane with connections between them of the type C—H···π involving a methylene-H and the benzene ring, and π···π. The shortest interaction of the latter type of 3.5911 (12) Å occurs between the S1,N1,C1,C6,C7 and N2–N4,C8,C9 five-membered rings, Fig. 3.