organic compounds
E)-(4-chlorobenzylidene)amino]-3-(2-methylbenzyl)-1H-1,2,4-triazole-5(4H)-thione
of 4-[(aSchool of Physics, Shri Mata Vaishno Devi University, Katra 182 320, J&K, India, bDepartment of Chemistry, Mangalore University, Mangalagangotri 574 199, D.K., Mangalore, India, cDepartment of Chemistry, P A College of Engineering, Nadupadavu 574 153, D.K., Mangalore, India, and dX-ray Crystallography Laboratory, Post-Graduate Department of Physics & Electronics, University of Jammu, Jammu Tawi 180 006, India
*Correspondence e-mail: rkant.ju@gmail.com
In the title molecule, C17H15ClN4S, the benzene rings form dihedral angles of 16.6 (1) and 77.2 (1)° with the triazole ring. The dihedral angle between the benzene rings is 86.6 (1)°. In the crystal, pairs of N—H⋯S hydrogen bonds form inversion dimers with graph-set notation R22(8). Weak C—H⋯S hydrogen bonds link these dimers into layers parallel to (100). Weak intramolecular C—H⋯S and C—H⋯N contacts are observed.
Keywords: crystal structure; Schiff base; 1,2,4-triazole; hydrogen bonding.
CCDC reference: 1018973
1. Related literature
For the chemistry of Schiff base compounds, see: Dubey & Vaid (1991); Yadav et al. (1994); Reddy & Lirgappa (1994); Wyrzykiewicz & Prukah (1998); Galic et al. (2001). For the biological activity of 1,2,4-triazole derivatives, see: Jones et al. (1965); Kane et al. (1988); Mullican et al. (1993); Cansiz et al. (2001). For the biological activity of sulfur- and nitrogen-containing compounds, see: Malik et al. (2011); Wei & Bell (1982). For related structures, see: Ding et al. (2009); Vinduvahini et al. (2011); Almutairi et al. (2012); Sarojini et al. (2013, 2014a,b). For standard bond-lengths, see: Allen et al. (1987). For hydrogen-bond graph-set notation, see: Bernstein et al. (1995).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: CrysAlis PRO (Oxford Diffraction, 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: PLATON (Spek, 2009) and ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: PLATON.
Supporting information
CCDC reference: 1018973
10.1107/S1600536814018352/lh5724sup1.cif
contains datablocks I, New_Global_Publ_Block. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536814018352/lh5724Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536814018352/lh5724Isup3.cml
4-Chlorobenzaldehyde (0.01 mol, 1.40 g) in ethanol (15 ml) was added to 4-amino-3-(2-methylbenzyl)-1H-1,2,4-triazole-5(4H)-thione (0.01 mol, 2.20 g) and heated to form a clear solution. To this few drops of conc. H2SO4 were added as a catalyst and refluxed for 36 h on water bath. The precipitate formed was filtered and recrystallized from methanol to get the title compound. Single crystals were obtained from methanol (mp. 443–445 K).
H3' attached to N3 was located in a difference map and refined isotropically. The remaining H atoms were positioned geometrically and were treated as riding on their parent C atoms, with C—H distances of 0.93–0.97 A; and with Uiso(H) = 1.2Ueq(C), except for the methyl groups where Uiso(H) = 1.5Ueq(C).
Data collection: CrysAlis PRO (Oxford Diffraction, 2010); cell
CrysAlis PRO (Oxford Diffraction, 2010); data reduction: CrysAlis PRO (Oxford Diffraction, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009) and ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: PLATON (Spek, 2009).Fig. 1. The molecular structure with ellipsoids drawn at the 40% probability level. H atoms are shown as small spheres of arbitrary radii. | |
Fig. 2. A pair molecules of the title compound. Dashed lines indicate N—H···S hydrogen bonds forming R22(8) graph set motifs linking the molecules into dimers. | |
Fig. 3. The packing arrangement of molecules viewed along the b axis. Hydrogen bonds are shown as dashed lines. |
C17H15ClN4S | F(000) = 712 |
Mr = 342.84 | Dx = 1.356 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 1855 reflections |
a = 13.4821 (9) Å | θ = 3.6–26.5° |
b = 6.8479 (4) Å | µ = 0.36 mm−1 |
c = 18.4895 (12) Å | T = 293 K |
β = 100.443 (6)° | Block, white |
V = 1678.75 (18) Å3 | 0.30 × 0.20 × 0.20 mm |
Z = 4 |
Oxford Diffraction Xcalibur, Sapphire3 diffractometer | 3306 independent reflections |
Radiation source: fine-focus sealed tube | 2252 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.028 |
Detector resolution: 16.1049 pixels mm-1 | θmax = 26.0°, θmin = 3.6° |
ω scans | h = −16→12 |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010) | k = −8→5 |
Tmin = 0.858, Tmax = 1.000 | l = −22→18 |
6947 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)] = 0.045 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.115 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0402P)2 + 0.2834P] where P = (Fo2 + 2Fc2)/3 |
3306 reflections | (Δ/σ)max < 0.001 |
213 parameters | Δρmax = 0.20 e Å−3 |
0 restraints | Δρmin = −0.24 e Å−3 |
C17H15ClN4S | V = 1678.75 (18) Å3 |
Mr = 342.84 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 13.4821 (9) Å | µ = 0.36 mm−1 |
b = 6.8479 (4) Å | T = 293 K |
c = 18.4895 (12) Å | 0.30 × 0.20 × 0.20 mm |
β = 100.443 (6)° |
Oxford Diffraction Xcalibur, Sapphire3 diffractometer | 3306 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010) | 2252 reflections with I > 2σ(I) |
Tmin = 0.858, Tmax = 1.000 | Rint = 0.028 |
6947 measured reflections |
R[F2 > 2σ(F2)] = 0.045 | 0 restraints |
wR(F2) = 0.115 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | Δρmax = 0.20 e Å−3 |
3306 reflections | Δρmin = −0.24 e Å−3 |
213 parameters |
Experimental. CrysAlis PRO, Oxford Diffraction Ltd., Version 1.171.34.40 (release 27–08-2010 CrysAlis171. NET) (compiled Aug 27 2010,11:50:40) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. |
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 | 0.07980 (5) | 0.72738 (9) | 0.46649 (4) | 0.0604 (2) | |
Cl1 | 0.43301 (6) | −0.35687 (10) | 0.54977 (5) | 0.0791 (3) | |
N2 | 0.11694 (13) | 0.6086 (2) | 0.61288 (11) | 0.0416 (5) | |
N1 | 0.17171 (13) | 0.4355 (2) | 0.61469 (11) | 0.0444 (5) | |
C6 | 0.27146 (17) | 0.0685 (3) | 0.61625 (13) | 0.0454 (6) | |
H6 | 0.2424 | 0.0961 | 0.6570 | 0.055* | |
C9 | 0.09068 (17) | 0.6762 (3) | 0.67729 (13) | 0.0450 (6) | |
C1 | 0.25988 (17) | 0.1987 (3) | 0.55810 (13) | 0.0468 (6) | |
N4 | 0.03338 (15) | 0.8286 (3) | 0.66436 (12) | 0.0576 (6) | |
C7 | 0.20400 (19) | 0.3820 (3) | 0.55848 (15) | 0.0550 (7) | |
H7 | 0.1924 | 0.4596 | 0.5165 | 0.066* | |
C4 | 0.36590 (18) | −0.1416 (3) | 0.55312 (14) | 0.0491 (6) | |
C5 | 0.32542 (17) | −0.1010 (3) | 0.61443 (14) | 0.0474 (6) | |
H5 | 0.3344 | −0.1868 | 0.6541 | 0.057* | |
N3 | 0.02267 (16) | 0.8556 (3) | 0.59013 (13) | 0.0569 (6) | |
C11 | 0.23908 (18) | 0.6491 (3) | 0.77823 (12) | 0.0459 (6) | |
C10 | 0.12992 (18) | 0.5931 (3) | 0.75064 (14) | 0.0516 (6) | |
H10A | 0.1244 | 0.4520 | 0.7481 | 0.062* | |
H10B | 0.0890 | 0.6391 | 0.7853 | 0.062* | |
C12 | 0.31449 (19) | 0.5143 (4) | 0.77442 (14) | 0.0549 (7) | |
H12 | 0.2972 | 0.3899 | 0.7562 | 0.066* | |
C8 | 0.07340 (16) | 0.7288 (3) | 0.55585 (14) | 0.0456 (6) | |
C3 | 0.3549 (2) | −0.0174 (4) | 0.49465 (15) | 0.0663 (8) | |
H3 | 0.3826 | −0.0473 | 0.4534 | 0.080* | |
C16 | 0.2652 (2) | 0.8359 (4) | 0.80624 (13) | 0.0554 (7) | |
C14 | 0.4396 (2) | 0.7446 (5) | 0.82462 (17) | 0.0775 (9) | |
H14 | 0.5069 | 0.7777 | 0.8407 | 0.093* | |
C2 | 0.3021 (2) | 0.1532 (4) | 0.49789 (15) | 0.0699 (8) | |
H2 | 0.2948 | 0.2397 | 0.4585 | 0.084* | |
C17 | 0.1871 (2) | 0.9886 (4) | 0.81350 (16) | 0.0759 (9) | |
H17A | 0.2199 | 1.1030 | 0.8366 | 0.114* | |
H17B | 0.1412 | 0.9382 | 0.8430 | 0.114* | |
H17C | 0.1506 | 1.0221 | 0.7656 | 0.114* | |
C15 | 0.3658 (3) | 0.8780 (4) | 0.82831 (16) | 0.0738 (9) | |
H15 | 0.3842 | 1.0020 | 0.8464 | 0.089* | |
C13 | 0.4148 (2) | 0.5614 (5) | 0.79722 (15) | 0.0720 (8) | |
H13 | 0.4649 | 0.4701 | 0.7941 | 0.086* | |
H3' | −0.0073 (19) | 0.954 (4) | 0.5690 (14) | 0.064 (8)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0735 (5) | 0.0570 (4) | 0.0470 (4) | 0.0249 (3) | 0.0007 (3) | −0.0027 (3) |
Cl1 | 0.0901 (6) | 0.0569 (4) | 0.0945 (6) | 0.0351 (4) | 0.0281 (5) | 0.0062 (4) |
N2 | 0.0369 (10) | 0.0382 (10) | 0.0481 (12) | 0.0069 (8) | 0.0032 (9) | −0.0019 (9) |
N1 | 0.0408 (11) | 0.0388 (10) | 0.0514 (13) | 0.0099 (8) | 0.0023 (10) | −0.0040 (9) |
C6 | 0.0512 (14) | 0.0440 (13) | 0.0430 (15) | 0.0035 (11) | 0.0138 (12) | 0.0008 (11) |
C9 | 0.0403 (13) | 0.0465 (13) | 0.0502 (16) | 0.0032 (10) | 0.0135 (11) | −0.0024 (11) |
C1 | 0.0506 (14) | 0.0438 (13) | 0.0451 (15) | 0.0129 (10) | 0.0062 (12) | 0.0019 (11) |
N4 | 0.0574 (13) | 0.0605 (13) | 0.0577 (15) | 0.0195 (10) | 0.0177 (11) | 0.0014 (11) |
C7 | 0.0651 (17) | 0.0471 (14) | 0.0531 (17) | 0.0207 (12) | 0.0120 (14) | 0.0080 (12) |
C4 | 0.0500 (14) | 0.0422 (13) | 0.0553 (16) | 0.0108 (11) | 0.0101 (12) | −0.0024 (12) |
C5 | 0.0526 (15) | 0.0406 (12) | 0.0486 (15) | 0.0067 (11) | 0.0079 (12) | 0.0093 (11) |
N3 | 0.0616 (14) | 0.0550 (13) | 0.0536 (15) | 0.0255 (11) | 0.0095 (11) | 0.0014 (11) |
C11 | 0.0556 (15) | 0.0528 (14) | 0.0308 (13) | −0.0013 (11) | 0.0119 (11) | 0.0091 (11) |
C10 | 0.0585 (16) | 0.0488 (13) | 0.0522 (16) | −0.0001 (12) | 0.0223 (13) | 0.0064 (12) |
C12 | 0.0590 (17) | 0.0611 (15) | 0.0430 (16) | 0.0058 (13) | 0.0051 (13) | 0.0030 (12) |
C8 | 0.0397 (13) | 0.0430 (12) | 0.0517 (15) | 0.0075 (10) | 0.0021 (11) | −0.0046 (11) |
C3 | 0.090 (2) | 0.0651 (17) | 0.0493 (17) | 0.0296 (15) | 0.0280 (15) | 0.0052 (14) |
C16 | 0.0769 (19) | 0.0574 (15) | 0.0338 (14) | −0.0077 (14) | 0.0151 (13) | 0.0048 (12) |
C14 | 0.063 (2) | 0.108 (3) | 0.057 (2) | −0.0215 (19) | −0.0024 (16) | 0.0029 (18) |
C2 | 0.101 (2) | 0.0657 (17) | 0.0464 (17) | 0.0376 (16) | 0.0231 (16) | 0.0186 (14) |
C17 | 0.115 (3) | 0.0588 (17) | 0.059 (2) | 0.0044 (16) | 0.0285 (18) | −0.0072 (14) |
C15 | 0.092 (2) | 0.076 (2) | 0.0499 (18) | −0.0228 (18) | 0.0031 (17) | −0.0016 (15) |
C13 | 0.0611 (19) | 0.103 (2) | 0.0496 (18) | 0.0169 (17) | 0.0025 (15) | 0.0046 (16) |
S1—C8 | 1.670 (3) | C11—C12 | 1.384 (3) |
Cl1—C4 | 1.736 (2) | C11—C16 | 1.401 (3) |
N2—C8 | 1.382 (3) | C11—C10 | 1.517 (3) |
N2—C9 | 1.382 (3) | C10—H10A | 0.9700 |
N2—N1 | 1.394 (2) | C10—H10B | 0.9700 |
N1—C7 | 1.252 (3) | C12—C13 | 1.380 (4) |
C6—C5 | 1.374 (3) | C12—H12 | 0.9300 |
C6—C1 | 1.383 (3) | C3—C2 | 1.375 (3) |
C6—H6 | 0.9300 | C3—H3 | 0.9300 |
C9—N4 | 1.295 (3) | C16—C15 | 1.375 (4) |
C9—C10 | 1.477 (3) | C16—C17 | 1.507 (4) |
C1—C2 | 1.375 (3) | C14—C15 | 1.362 (4) |
C1—C7 | 1.465 (3) | C14—C13 | 1.371 (4) |
N4—N3 | 1.366 (3) | C14—H14 | 0.9300 |
C7—H7 | 0.9300 | C2—H2 | 0.9300 |
C4—C3 | 1.363 (3) | C17—H17A | 0.9600 |
C4—C5 | 1.373 (3) | C17—H17B | 0.9600 |
C5—H5 | 0.9300 | C17—H17C | 0.9600 |
N3—C8 | 1.335 (3) | C15—H15 | 0.9300 |
N3—H3' | 0.85 (2) | C13—H13 | 0.9300 |
C8—N2—C9 | 108.55 (18) | C11—C10—H10B | 109.2 |
C8—N2—N1 | 132.44 (19) | H10A—C10—H10B | 107.9 |
C9—N2—N1 | 118.78 (19) | C13—C12—C11 | 121.1 (3) |
C7—N1—N2 | 119.4 (2) | C13—C12—H12 | 119.4 |
C5—C6—C1 | 120.7 (2) | C11—C12—H12 | 119.4 |
C5—C6—H6 | 119.6 | N3—C8—N2 | 102.0 (2) |
C1—C6—H6 | 119.6 | N3—C8—S1 | 126.62 (18) |
N4—C9—N2 | 110.4 (2) | N2—C8—S1 | 131.34 (17) |
N4—C9—C10 | 125.6 (2) | C4—C3—C2 | 118.6 (2) |
N2—C9—C10 | 123.8 (2) | C4—C3—H3 | 120.7 |
C2—C1—C6 | 118.6 (2) | C2—C3—H3 | 120.7 |
C2—C1—C7 | 119.1 (2) | C15—C16—C11 | 118.0 (3) |
C6—C1—C7 | 122.3 (2) | C15—C16—C17 | 119.7 (3) |
C9—N4—N3 | 104.2 (2) | C11—C16—C17 | 122.3 (3) |
N1—C7—C1 | 120.7 (2) | C15—C14—C13 | 120.1 (3) |
N1—C7—H7 | 119.6 | C15—C14—H14 | 120.0 |
C1—C7—H7 | 119.6 | C13—C14—H14 | 120.0 |
C3—C4—C5 | 121.8 (2) | C3—C2—C1 | 121.4 (2) |
C3—C4—Cl1 | 119.0 (2) | C3—C2—H2 | 119.3 |
C5—C4—Cl1 | 119.28 (19) | C1—C2—H2 | 119.3 |
C4—C5—C6 | 118.9 (2) | C16—C17—H17A | 109.5 |
C4—C5—H5 | 120.6 | C16—C17—H17B | 109.5 |
C6—C5—H5 | 120.6 | H17A—C17—H17B | 109.5 |
C8—N3—N4 | 114.8 (2) | C16—C17—H17C | 109.5 |
C8—N3—H3' | 123.0 (18) | H17A—C17—H17C | 109.5 |
N4—N3—H3' | 121.7 (18) | H17B—C17—H17C | 109.5 |
C12—C11—C16 | 119.3 (2) | C14—C15—C16 | 122.4 (3) |
C12—C11—C10 | 119.4 (2) | C14—C15—H15 | 118.8 |
C16—C11—C10 | 121.2 (2) | C16—C15—H15 | 118.8 |
C9—C10—C11 | 112.06 (19) | C14—C13—C12 | 119.1 (3) |
C9—C10—H10A | 109.2 | C14—C13—H13 | 120.4 |
C11—C10—H10A | 109.2 | C12—C13—H13 | 120.4 |
C9—C10—H10B | 109.2 | ||
C8—N2—N1—C7 | 12.7 (3) | C10—C11—C12—C13 | 178.3 (2) |
C9—N2—N1—C7 | −173.4 (2) | N4—N3—C8—N2 | 2.0 (3) |
C8—N2—C9—N4 | 0.5 (3) | N4—N3—C8—S1 | −177.43 (18) |
N1—N2—C9—N4 | −174.75 (18) | C9—N2—C8—N3 | −1.4 (2) |
C8—N2—C9—C10 | −175.1 (2) | N1—N2—C8—N3 | 172.9 (2) |
N1—N2—C9—C10 | 9.7 (3) | C9—N2—C8—S1 | 177.92 (18) |
C5—C6—C1—C2 | 1.1 (4) | N1—N2—C8—S1 | −7.7 (4) |
C5—C6—C1—C7 | −179.2 (2) | C5—C4—C3—C2 | 0.3 (4) |
N2—C9—N4—N3 | 0.7 (3) | Cl1—C4—C3—C2 | −179.7 (2) |
C10—C9—N4—N3 | 176.2 (2) | C12—C11—C16—C15 | 0.6 (3) |
N2—N1—C7—C1 | −178.63 (19) | C10—C11—C16—C15 | −178.2 (2) |
C2—C1—C7—N1 | −174.1 (3) | C12—C11—C16—C17 | −178.7 (2) |
C6—C1—C7—N1 | 6.1 (4) | C10—C11—C16—C17 | 2.5 (3) |
C3—C4—C5—C6 | 0.8 (4) | C4—C3—C2—C1 | −0.7 (5) |
Cl1—C4—C5—C6 | −179.26 (18) | C6—C1—C2—C3 | 0.0 (4) |
C1—C6—C5—C4 | −1.5 (4) | C7—C1—C2—C3 | −179.7 (3) |
C9—N4—N3—C8 | −1.7 (3) | C13—C14—C15—C16 | 0.9 (5) |
N4—C9—C10—C11 | −101.5 (3) | C11—C16—C15—C14 | −0.8 (4) |
N2—C9—C10—C11 | 73.5 (3) | C17—C16—C15—C14 | 178.5 (3) |
C12—C11—C10—C9 | −102.1 (2) | C15—C14—C13—C12 | −0.7 (5) |
C16—C11—C10—C9 | 76.6 (3) | C11—C12—C13—C14 | 0.5 (4) |
C16—C11—C12—C13 | −0.5 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3′···S1i | 0.84 (3) | 2.43 (3) | 3.261 (2) | 167 (2) |
C17—H17B···S1ii | 0.96 | 2.81 | 3.710 (3) | 157 |
C17—H17C···N4 | 0.96 | 2.59 | 3.321 (4) | 134 |
C7—H7···S1 | 0.93 | 2.45 | 3.203 (2) | 138 |
Symmetry codes: (i) −x, −y+2, −z+1; (ii) x, −y+3/2, z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3'···S1i | 0.84 (3) | 2.43 (3) | 3.261 (2) | 167 (2) |
C17—H17B···S1ii | 0.96 | 2.81 | 3.710 (3) | 157 |
C17—H17C···N4 | 0.96 | 2.59 | 3.321 (4) | 134 |
C7—H7···S1 | 0.93 | 2.45 | 3.203 (2) | 138 |
Symmetry codes: (i) −x, −y+2, −z+1; (ii) x, −y+3/2, z+1/2. |
Acknowledgements
RK acknowledges the Department of Science & Technology for the single-crystal X-ray diffractometer sanctioned as a National Facility under Project No. SR/S2/CMP-47/2003. BKS and PSM gratefully acknowledge the Department of Chemistry, P. A. College of Engineering, for providing research facilities.
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The synthesis and structural investigation of Schiff base compounds have attracted much attention due to their interesting structures and potential applications. During the last few decades, there has been a considerable interest in the chemistry of Schiff base compounds (Dubey & Vaid 1991; Yadav et al., 1994). The derivatives of 1,2,4-triazole are known to exhibit anti-inflammatory (Mullican et al., 1993), antiviral (Jones et al., 1965), antimicrobial (Cansiz et al., 2001), and antidepressant activity (Kane et al., 1988). Schiff bases, containing different donor atoms, also find use in analytical applications and metal coordination (Galic et al., 2001; Wyrzykiewicz & Prukah, 1998; Reddy & Lirgappa, 1994). Since many compounds containing sulfur and nitrogen atoms are antihypertensive (Wei et al., 1982) and fungicidal (Malik et al., 2011), synthesis of the corresponding heterocyclic compounds could be of interest from the viewpoint of chemical reactivity and biological activity. The crystal structures of some of the related Schiff's bases viz: 3-Methyl-4-{(E)-[4-(methylsulfanyl)benzylidene]amino}-1H-1, 2,4-triazole-5(4H)-thione; 4-[(E)-(4-chloro¬benzyl-idene)amino]-3-methyl-1H -1,2,4-triazole-5(4H)-thione; 4-[(E)-(4-Hy¬droxy¬benzyl¬idene)amino] -3-methyl-1H-1,2,4-triazole-5(4H)-thione (Sarojini et al., 2013, 2014a, b); 3-[2-(2,6-Dichloro-anilino)benzyl]-4- [(4-methoxybenzylidene)amino]-1H-1,2,4-triazole-5(4H) -thione (Vinduvahini et al., 2011); 3-(Adamantan-1-yl)-1-[(4-ethylpiperazin-1-yl)methyl]-4- [(E)-(4-hydroxy-benzylidene)amino]-1H-1,2,4-triazole-5(4H) -thione (Almutairi et al., 2012);(E)-4-[(4-Fluorobenzylidene)amino]-3-[1- (4-isobutylphenyl)ethyl]-1-(morpholinomethyl)-1H- 1,2,4-triazole-5(4H)-thione methanol hemisolvate, (E)-3-(2-ethoxyphenyl)-4-(2-fluorobenzylideneamino) -1H-1,2,4-triazole-5(4H)-thione (Ding et al., 2009) have been reported. In the title compound (I) (Fig. 1), all bond lengths are within normal ranges (Allen et al., 1987). The dihedral angles between the mean planes of the chloro-substituted benzene ring and methyl-substituted benzene ring is 86.6 (1)°. The triazole ring forms dihedral angles of 16.6 (1) and 77.2 (1)°, respectively, with the C1—C6 and C11—C16 rings. In the crystal, N—H···S hydrogen bonds and two intramolecular interactions of the type C—H···N and C—H···S are observed (Table 2). Centrosymmetric dimeric aggregates are formed by pairs of N3—H3'···S1 hydrogen bonds forming R22(8) ring motifs (Bernstein et al., 1995). Intermolecular C—H···S hydrogen bonds link the molecules into a two-dimensional network paralell to (100) (Fig. 3).