organic compounds
A monoclinic polymorph of (1E,5E)-1,5-bis(2-hydroxybenzylidene)thiocarbonohydrazide
aNelson Mandela Metropolitan University, Summerstrand Campus, Department of Chemistry, University Way, Summerstrand, PO Box 77000, Port Elizabeth 6031, South Africa
*Correspondence e-mail: richard.betz@webmail.co.za
The title compound, C15H14N4O2S, is a derivative of thioureadihydrazide. In contrast to the previously reported polymorph (orthorhombic, Pbca, Z = 8), the current study revealed monoclinic symmetry (space group P21/n, Z = 4). The molecule shows non-crystallographic C2 as well as approximate Cs symmetry. Intramolecular bifurcated O—H⋯(N,S) hydrogen bonds, are present. In the crystal, intermolecular N—H⋯S hydrogen bonds and C—H⋯π contacts connect the molecules into undulating chains along the b axis. The shortest centroid–centroid distance between two aromatic systems is 4.5285 (12) Å.
Related literature
For the et al. (1999). For the of a methylated derivative of the title compound, see: Affan et al. (2010). For graph-set analysis of hydrogen bonds, see: Etter et al. (1990); Bernstein et al. (1995). Structures containing similar C=S distances were retrieved from the Cambridge Structural Database (Allen, 2002). For chelate ligands in coordination chemistry, see: Gade (1998).
of the orthorhombic polymorph of the title compound reported without three-dimensional coordinates, see: YanpingExperimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2010); cell SAINT (Bruker, 2010); data reduction: SAINT; program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supporting information
10.1107/S1600536811030340/kj2182sup1.cif
contains datablocks I, global. DOI:Supporting information file. DOI: 10.1107/S1600536811030340/kj2182Isup2.cdx
Structure factors: contains datablock I. DOI: 10.1107/S1600536811030340/kj2182Isup3.hkl
Supporting information file. DOI: 10.1107/S1600536811030340/kj2182Isup4.cml
The compound was prepared upon reacting thiocarbohydrazide (0.50 mmol) with ortho-hydroxybenzaldehyde (1.00 mmol) in refluxing ethanol (15 ml) under nitrogen in analogy to a published procedure (Yanping et al., 1999). Crystals suitable for the X-ray diffraction study were obtained upon slow evaporation of the reaction mixture.
Carbon-bound H atoms were placed in calculated positions (C—H 0.95 Å) and were included in the
in the riding model approximation, with U(H) set to 1.2Ueq(C). The H atom of the hydroxyl groups were allowed to rotate with a fixed angle around their respective C—O bonds to best fit the experimental electron density (HFIX 147 in the SHELX program suite (Sheldrick, 2008)). The H atoms of the amine groups were located on a difference Fourier map and refined with individual displacement parameters.Data collection: APEX2 (Bruker, 2010); cell
SAINT (Bruker, 2010); data reduction: SAINT (Bruker, 2010); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. The molecular structure of the title compound, with atom labels and anisotropic displacement ellipsoids (drawn at 50% probability level). | |
Fig. 2. Intermolecular contacts, viewed along [-1 0 0]. Depicted are intramolecular (green dashed lines) as well as intermolecular (blue dashed lines) hydrogen bonds and C–H···π contacts (red dashed lines). Symmetry operators: i -x + 1, y - 1/2, -z + 1/2; ii -x + 1, y + 1/2, -z + 1/2. |
C15H14N4O2S | F(000) = 656 |
Mr = 314.36 | Dx = 1.454 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71069 Å |
Hall symbol: -P 2ybc | Cell parameters from 3781 reflections |
a = 5.6020 (1) Å | θ = 3.3–28.2° |
b = 7.4260 (2) Å | µ = 0.24 mm−1 |
c = 34.5220 (8) Å | T = 200 K |
β = 91.225 (1)° | Block, colourless |
V = 1435.80 (6) Å3 | 0.20 × 0.17 × 0.10 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 3578 independent reflections |
Radiation source: fine-focus sealed tube | 2830 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.027 |
ϕ and ω scans | θmax = 28.3°, θmin = 2.4° |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | h = −7→7 |
Tmin = 0.879, Tmax = 1.000 | k = −9→9 |
13304 measured reflections | l = −46→45 |
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)] = 0.048 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.116 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.11 | w = 1/[σ2(Fo2) + (0.0459P)2 + 0.6828P] where P = (Fo2 + 2Fc2)/3 |
3578 reflections | (Δ/σ)max < 0.001 |
209 parameters | Δρmax = 0.31 e Å−3 |
0 restraints | Δρmin = −0.30 e Å−3 |
C15H14N4O2S | V = 1435.80 (6) Å3 |
Mr = 314.36 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 5.6020 (1) Å | µ = 0.24 mm−1 |
b = 7.4260 (2) Å | T = 200 K |
c = 34.5220 (8) Å | 0.20 × 0.17 × 0.10 mm |
β = 91.225 (1)° |
Bruker APEXII CCD diffractometer | 3578 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | 2830 reflections with I > 2σ(I) |
Tmin = 0.879, Tmax = 1.000 | Rint = 0.027 |
13304 measured reflections |
R[F2 > 2σ(F2)] = 0.048 | 0 restraints |
wR(F2) = 0.116 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.11 | Δρmax = 0.31 e Å−3 |
3578 reflections | Δρmin = −0.30 e Å−3 |
209 parameters |
x | y | z | Uiso*/Ueq | ||
S1 | 0.12373 (8) | 0.21558 (7) | 0.258163 (14) | 0.02903 (14) | |
O1 | 0.1741 (2) | 0.2387 (2) | 0.36537 (4) | 0.0324 (3) | |
H81 | 0.2203 | 0.2637 | 0.3430 | 0.049* | |
O2 | −0.1378 (2) | 0.2458 (2) | 0.15547 (4) | 0.0383 (4) | |
H82 | −0.0382 | 0.2723 | 0.1731 | 0.057* | |
N1 | 0.5251 (3) | 0.3922 (2) | 0.27723 (4) | 0.0281 (4) | |
H71 | 0.646 (4) | 0.457 (3) | 0.2711 (6) | 0.037 (6)* | |
N2 | 0.4749 (3) | 0.3542 (2) | 0.31484 (4) | 0.0265 (3) | |
N3 | 0.4199 (3) | 0.4051 (2) | 0.21391 (5) | 0.0294 (4) | |
H73 | 0.546 (5) | 0.466 (4) | 0.2103 (7) | 0.053 (8)* | |
N4 | 0.2684 (3) | 0.3694 (2) | 0.18331 (4) | 0.0274 (3) | |
C1 | 0.3648 (3) | 0.3442 (2) | 0.24941 (5) | 0.0248 (4) | |
C2 | 0.6209 (3) | 0.4048 (2) | 0.34167 (5) | 0.0256 (4) | |
H2 | 0.7674 | 0.4613 | 0.3355 | 0.031* | |
C3 | 0.3279 (3) | 0.4210 (2) | 0.14954 (5) | 0.0255 (4) | |
H3 | 0.4739 | 0.4834 | 0.1460 | 0.031* | |
C11 | 0.5583 (3) | 0.3740 (2) | 0.38171 (5) | 0.0237 (4) | |
C12 | 0.3391 (3) | 0.2956 (3) | 0.39193 (5) | 0.0258 (4) | |
C13 | 0.2860 (3) | 0.2726 (3) | 0.43090 (6) | 0.0303 (4) | |
H13 | 0.1391 | 0.2186 | 0.4378 | 0.036* | |
C14 | 0.4458 (4) | 0.3279 (3) | 0.45949 (6) | 0.0319 (4) | |
H14 | 0.4073 | 0.3126 | 0.4860 | 0.038* | |
C15 | 0.6625 (4) | 0.4057 (3) | 0.44992 (6) | 0.0312 (4) | |
H15 | 0.7718 | 0.4439 | 0.4697 | 0.037* | |
C16 | 0.7166 (3) | 0.4266 (3) | 0.41139 (6) | 0.0270 (4) | |
H16 | 0.8656 | 0.4783 | 0.4049 | 0.032* | |
C21 | 0.1696 (3) | 0.3832 (2) | 0.11659 (5) | 0.0239 (4) | |
C22 | −0.0524 (3) | 0.2973 (3) | 0.12065 (6) | 0.0287 (4) | |
C23 | −0.1919 (4) | 0.2586 (3) | 0.08796 (6) | 0.0345 (5) | |
H23 | −0.3413 | 0.2000 | 0.0907 | 0.041* | |
C24 | −0.1148 (4) | 0.3048 (3) | 0.05168 (6) | 0.0368 (5) | |
H24 | −0.2114 | 0.2772 | 0.0295 | 0.044* | |
C25 | 0.1036 (4) | 0.3915 (3) | 0.04711 (6) | 0.0336 (5) | |
H25 | 0.1562 | 0.4234 | 0.0221 | 0.040* | |
C26 | 0.2414 (3) | 0.4301 (3) | 0.07948 (5) | 0.0277 (4) | |
H26 | 0.3896 | 0.4903 | 0.0765 | 0.033* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0237 (2) | 0.0299 (3) | 0.0336 (3) | −0.0028 (2) | 0.00372 (17) | 0.0010 (2) |
O1 | 0.0251 (7) | 0.0398 (8) | 0.0323 (7) | −0.0086 (6) | 0.0007 (5) | 0.0014 (6) |
O2 | 0.0254 (7) | 0.0448 (9) | 0.0447 (8) | −0.0075 (6) | 0.0017 (6) | 0.0091 (7) |
N1 | 0.0250 (8) | 0.0338 (9) | 0.0255 (8) | −0.0060 (7) | 0.0014 (6) | 0.0048 (7) |
N2 | 0.0276 (8) | 0.0275 (8) | 0.0245 (8) | 0.0005 (7) | 0.0027 (6) | 0.0037 (6) |
N3 | 0.0279 (8) | 0.0351 (10) | 0.0250 (8) | −0.0074 (7) | −0.0010 (6) | 0.0033 (7) |
N4 | 0.0258 (8) | 0.0285 (9) | 0.0277 (8) | −0.0019 (7) | −0.0019 (6) | −0.0007 (7) |
C1 | 0.0240 (9) | 0.0211 (9) | 0.0292 (9) | 0.0036 (7) | 0.0019 (7) | 0.0003 (7) |
C2 | 0.0230 (9) | 0.0236 (9) | 0.0303 (9) | −0.0002 (7) | 0.0023 (7) | 0.0041 (7) |
C3 | 0.0235 (9) | 0.0235 (9) | 0.0296 (9) | −0.0008 (7) | −0.0003 (7) | −0.0003 (7) |
C11 | 0.0233 (8) | 0.0193 (9) | 0.0286 (9) | 0.0021 (7) | 0.0031 (7) | 0.0026 (7) |
C12 | 0.0226 (8) | 0.0226 (9) | 0.0322 (9) | 0.0013 (7) | 0.0016 (7) | 0.0008 (8) |
C13 | 0.0265 (9) | 0.0299 (10) | 0.0347 (10) | 0.0021 (8) | 0.0073 (8) | 0.0050 (8) |
C14 | 0.0372 (11) | 0.0314 (11) | 0.0273 (9) | 0.0063 (9) | 0.0054 (8) | 0.0023 (8) |
C15 | 0.0358 (10) | 0.0312 (11) | 0.0264 (9) | 0.0010 (9) | −0.0037 (8) | −0.0011 (8) |
C16 | 0.0234 (9) | 0.0235 (9) | 0.0340 (10) | −0.0007 (7) | −0.0018 (7) | 0.0009 (7) |
C21 | 0.0224 (8) | 0.0197 (9) | 0.0296 (9) | 0.0029 (7) | −0.0016 (7) | −0.0014 (7) |
C22 | 0.0230 (8) | 0.0233 (9) | 0.0397 (10) | 0.0028 (8) | −0.0002 (7) | 0.0021 (8) |
C23 | 0.0250 (9) | 0.0249 (10) | 0.0534 (13) | 0.0002 (8) | −0.0081 (9) | −0.0013 (9) |
C24 | 0.0354 (11) | 0.0314 (11) | 0.0428 (11) | 0.0076 (9) | −0.0158 (9) | −0.0074 (9) |
C25 | 0.0367 (11) | 0.0353 (12) | 0.0288 (10) | 0.0099 (9) | −0.0027 (8) | −0.0024 (8) |
C26 | 0.0254 (9) | 0.0255 (10) | 0.0319 (10) | 0.0032 (8) | −0.0002 (8) | 0.0008 (8) |
S1—C1 | 1.6867 (19) | C12—C13 | 1.394 (3) |
O1—C12 | 1.356 (2) | C13—C14 | 1.381 (3) |
O1—H81 | 0.8400 | C13—H13 | 0.9500 |
O2—C22 | 1.359 (2) | C14—C15 | 1.390 (3) |
O2—H82 | 0.8400 | C14—H14 | 0.9500 |
N1—C1 | 1.349 (2) | C15—C16 | 1.379 (3) |
N1—N2 | 1.364 (2) | C15—H15 | 0.9500 |
N1—H71 | 0.86 (2) | C16—H16 | 0.9500 |
N2—C2 | 1.279 (2) | C21—C26 | 1.395 (3) |
N3—C1 | 1.348 (2) | C21—C22 | 1.407 (3) |
N3—N4 | 1.367 (2) | C22—C23 | 1.389 (3) |
N3—H73 | 0.85 (3) | C23—C24 | 1.377 (3) |
N4—C3 | 1.278 (2) | C23—H23 | 0.9500 |
C2—C11 | 1.451 (2) | C24—C25 | 1.394 (3) |
C2—H2 | 0.9500 | C24—H24 | 0.9500 |
C3—C21 | 1.455 (2) | C25—C26 | 1.375 (3) |
C3—H3 | 0.9500 | C25—H25 | 0.9500 |
C11—C16 | 1.396 (3) | C26—H26 | 0.9500 |
C11—C12 | 1.411 (2) | ||
C12—O1—H81 | 109.5 | C13—C14—C15 | 120.65 (17) |
C22—O2—H82 | 109.5 | C13—C14—H14 | 119.7 |
C1—N1—N2 | 118.38 (15) | C15—C14—H14 | 119.7 |
C1—N1—H71 | 119.2 (15) | C16—C15—C14 | 119.13 (18) |
N2—N1—H71 | 121.9 (15) | C16—C15—H15 | 120.4 |
C2—N2—N1 | 119.14 (16) | C14—C15—H15 | 120.4 |
C1—N3—N4 | 119.14 (16) | C15—C16—C11 | 121.80 (18) |
C1—N3—H73 | 121.2 (17) | C15—C16—H16 | 119.1 |
N4—N3—H73 | 119.7 (17) | C11—C16—H16 | 119.1 |
C3—N4—N3 | 118.46 (16) | C26—C21—C22 | 118.51 (17) |
N3—C1—N1 | 113.38 (16) | C26—C21—C3 | 119.15 (16) |
N3—C1—S1 | 123.54 (14) | C22—C21—C3 | 122.33 (17) |
N1—C1—S1 | 123.06 (14) | O2—C22—C23 | 117.24 (17) |
N2—C2—C11 | 118.67 (16) | O2—C22—C21 | 123.01 (17) |
N2—C2—H2 | 120.7 | C23—C22—C21 | 119.73 (18) |
C11—C2—H2 | 120.7 | C24—C23—C22 | 120.37 (19) |
N4—C3—C21 | 119.25 (17) | C24—C23—H23 | 119.8 |
N4—C3—H3 | 120.4 | C22—C23—H23 | 119.8 |
C21—C3—H3 | 120.4 | C23—C24—C25 | 120.72 (19) |
C16—C11—C12 | 118.32 (17) | C23—C24—H24 | 119.6 |
C16—C11—C2 | 119.49 (16) | C25—C24—H24 | 119.6 |
C12—C11—C2 | 122.18 (17) | C26—C25—C24 | 118.90 (19) |
O1—C12—C13 | 117.24 (16) | C26—C25—H25 | 120.6 |
O1—C12—C11 | 122.97 (16) | C24—C25—H25 | 120.6 |
C13—C12—C11 | 119.79 (17) | C25—C26—C21 | 121.76 (18) |
C14—C13—C12 | 120.30 (18) | C25—C26—H26 | 119.1 |
C14—C13—H13 | 119.9 | C21—C26—H26 | 119.1 |
C12—C13—H13 | 119.9 | ||
C1—N1—N2—C2 | −177.46 (17) | C13—C14—C15—C16 | −0.2 (3) |
C1—N3—N4—C3 | −176.94 (18) | C14—C15—C16—C11 | 0.8 (3) |
N4—N3—C1—N1 | −178.39 (16) | C12—C11—C16—C15 | −0.7 (3) |
N4—N3—C1—S1 | 3.2 (3) | C2—C11—C16—C15 | 177.92 (17) |
N2—N1—C1—N3 | 173.21 (16) | N4—C3—C21—C26 | −176.19 (17) |
N2—N1—C1—S1 | −8.4 (2) | N4—C3—C21—C22 | 2.4 (3) |
N1—N2—C2—C11 | 176.08 (16) | C26—C21—C22—O2 | 179.74 (17) |
N3—N4—C3—C21 | 179.64 (16) | C3—C21—C22—O2 | 1.1 (3) |
N2—C2—C11—C16 | 179.37 (17) | C26—C21—C22—C23 | 1.1 (3) |
N2—C2—C11—C12 | −2.0 (3) | C3—C21—C22—C23 | −177.55 (17) |
C16—C11—C12—O1 | −179.45 (17) | O2—C22—C23—C24 | −179.10 (18) |
C2—C11—C12—O1 | 1.9 (3) | C21—C22—C23—C24 | −0.4 (3) |
C16—C11—C12—C13 | 0.0 (3) | C22—C23—C24—C25 | −0.2 (3) |
C2—C11—C12—C13 | −178.65 (17) | C23—C24—C25—C26 | 0.1 (3) |
O1—C12—C13—C14 | −179.87 (17) | C24—C25—C26—C21 | 0.6 (3) |
C11—C12—C13—C14 | 0.7 (3) | C22—C21—C26—C25 | −1.2 (3) |
C12—C13—C14—C15 | −0.6 (3) | C3—C21—C26—C25 | 177.45 (17) |
Cg1 and Cg2 are the centroids of the C11–C16 and C21–C26 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H81···N2 | 0.84 | 1.87 | 2.597 (2) | 144 |
O1—H81···S1 | 0.84 | 2.99 | 3.7096 (14) | 145 |
O2—H82···N4 | 0.84 | 1.89 | 2.617 (2) | 144 |
O2—H82···S1 | 0.84 | 3.08 | 3.8135 (16) | 147 |
N1—H71···S1i | 0.86 (2) | 2.53 (2) | 3.3514 (17) | 159 (2) |
N3—H73···S1i | 0.85 (3) | 2.82 (3) | 3.5605 (18) | 147 (2) |
C16—H16···Cg2i | 0.95 | 2.81 | 3.423 (2) | 123 |
C26—H26···Cg1i | 0.95 | 2.74 | 3.438 (2) | 130 |
Symmetry code: (i) −x+1, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C15H14N4O2S |
Mr | 314.36 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 200 |
a, b, c (Å) | 5.6020 (1), 7.4260 (2), 34.5220 (8) |
β (°) | 91.225 (1) |
V (Å3) | 1435.80 (6) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.24 |
Crystal size (mm) | 0.20 × 0.17 × 0.10 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2008) |
Tmin, Tmax | 0.879, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 13304, 3578, 2830 |
Rint | 0.027 |
(sin θ/λ)max (Å−1) | 0.668 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.048, 0.116, 1.11 |
No. of reflections | 3578 |
No. of parameters | 209 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.31, −0.30 |
Computer programs: APEX2 (Bruker, 2010), SAINT (Bruker, 2010), SIR97 (Altomare et al., 1999), ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2008), SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).
Cg1 and Cg2 are the centroids of the C11–C16 and C21–C26 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H81···N2 | 0.84 | 1.87 | 2.597 (2) | 144.2 |
O1—H81···S1 | 0.84 | 2.99 | 3.7096 (14) | 145.2 |
O2—H82···N4 | 0.84 | 1.89 | 2.617 (2) | 144.3 |
O2—H82···S1 | 0.84 | 3.08 | 3.8135 (16) | 146.6 |
N1—H71···S1i | 0.86 (2) | 2.53 (2) | 3.3514 (17) | 159 (2) |
N3—H73···S1i | 0.85 (3) | 2.82 (3) | 3.5605 (18) | 147 (2) |
C16—H16···Cg2i | 0.95 | 2.81 | 3.423 (2) | 123 |
C26—H26···Cg1i | 0.95 | 2.74 | 3.438 (2) | 130 |
Symmetry code: (i) −x+1, y+1/2, −z+1/2. |
Acknowledgements
The authors thank Mrs Gisela Bräuer for helpful discussions.
References
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Chelate ligands have found widespread use in coordination chemistry due to the enhanced thermodynamic stability of resultant coordination compounds in relation to coordination compounds exclusively applying comparable monodentate ligands (Gade, 1998). Combining different donor atoms, a molecular set-up to accomodate a large variety of metal centers of variable Lewis acidity is at hand. In this aspect, the title compound seemed particularily interesting due to its use as strictly neutral or – depending on the pH value – as anionic or cationic ligand. In addition, due to the set-up of its donor atoms, a multitude of differently-sized chelate ligands can be formed. The presence of a thioketo group as well as amino groups, hydroxyl groups and imine-type nitrogen atoms further enhances the versatility of the title compound's ligating abilities. In our continuous interest in elucidating the rules influencing the formation of coordination compounds with different set-ups of NOS-donor atoms, we determined the crystal structure of the title compound to enable comparative studies with geometric parameters in envisioned coordination compounds. Although the compound has been reported to crystallize in the orthorhombic space group Pbca (Yanping et al., 1999), we found a monoclinic polymorph. Furthermore, no three-dimensional coordinates have been deposited for the former structure solution. The molecular and crystal structure of a methyl-substituted derivative of the title compound is apparent in the literature as well (Affan et al., 2010).
The molecule is essentially planar. The least-squares planes defined by the carbon atoms of the phenyl groups (including the respective C=N moiety) intersect at an angle of only 5.33 (8) °. The least-squares plane defined by the atoms of the central N2C=S motif encloses angles of 7.26 (8) ° and 11.75 (7) ° with the aforementioned least-squares planes, respectively (Fig. 1). The C=N double bonds are invariably (E)-configured. The length of the C=S bond is in good agreement with values reported for other thioketones whose crystal structural data have been deposited with the Cambridge Structural Database (Allen, 2002), the reported range being 1.297–1.864 Å.
In the crystal structure, intra- as well as intermolecular hydrogen bonds are apparent. While the intramolecular hydrogen bond – stemming from the hydroxyl group – shows bifurcation between the sulfur atom as well as the imine-type nitrogen atom, the intermolecular hydrogen bonds exclusively have the sulfur atom as acceptor. The presence of the sulfur-supported hydrogen bond is complemented by the results of IR spectroscopy that show the presence of three bands in the region for hydrogen bonds between oxygen, nitrogen and sulfur. In addition, C–H···π contacts can be observed that involve hydrogen atoms on the aromatic system. In terms of graph-set analysis (Etter et al., 1990; Bernstein et al., 1995), the descriptor for the bifurcated hydrogen bond is S(6)S(9) on the unitary level while the amino-group-supported hydrogen bonds necessitate a C11(4)C11(4) descriptor on the same level. A binary descriptor of R12(6) emphasizes the "chelation" of the sulfur atom by the two secondary amino groups. In total, the molecules are connected to waved, zigzag-type chains along the crystallographic b axis. The shortest intercentroid distance between two π-systems was measured at 4.5285 (12) Å and involves both aromatic moieties (Fig. 2).