organic compounds
3-{(E)-[1-(2-Hydroxyphenyl)ethylidene]amino}-1-(2-methylphenyl)thiourea
aFaculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia, and bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: edward.tiekink@gmail.com
In the title thiourea derivative, C16H17N3OS, the hydroxy- and methyl-substituted benzene rings form dihedral angles of 9.62 (12) and 55.69 (6)°, respectively, with the central CN3S chromophore (r.m.s. deviation = 0.0117 Å). An intramolecular O—H⋯N hydrogen bond ensures the coplanarity of the central atoms. The H atoms of the NH groups are syn and the conformation about the N=C double bond [1.295 (4) Å] is E. In the crystal, helical supramolecular chains sustained primarily by N—H⋯S hydrogen bonds are found. Additional stabilization is provided by C—H⋯π and π–π [ring centroid(hydroxybenzene)⋯ring centroid(methylbenzene) = 3.8524 (18) Å] interactions.
Related literature
For pharmaceutical applications of thioruea derivatives, see: Venkatachalam et al. (2004); Bruce et al. (2007). For related thiourea structures, see: Normaya et al. (2011); Salam et al. (2011); Dzulkifli et al. (2011).
Experimental
Crystal data
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Refinement
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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
10.1107/S1600536811013729/hg5025sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811013729/hg5025Isup2.hkl
2-Methylphenylisothiocyanate (0.746 g, 5 mmol) and hydrazine hydrate (0.253 g, 5 mmol), each dissolved in 10 ml e thanol, were mixed with constant stirring. The stirring was continued for 30 min and the white product formed was washed with ethanol and dried in vacuo. A solution of the isolated 2-methylphenylthiosemicarbazide (0.540 g, 3 mmol) in 10 ml me thanol was then refluxed with a methanolic solution of 2-hydroxyacetophenone (0.408 g, 3 mmol) for 5 h after adding 1–2 drops of glacial acetic acid. On cooling, the solution to room temperature, a light-yellow powder separated and washed with methanol. The powder was recrystallized from methanol and dried in vacuo over silica gel. (M.pt. 451–453 K. Yield 0.740 g (78%). Elemental analysis: Calc. for C16H17N3OS: C, 64.21; H, 5.73; N, 14.04%. Found: C, 64.17; H, 5.67; N, 14.01%. FT—IR (KBr, cm-1) νmax: 3175 (m, OH), 3000 (s, NH), 1583 (w, C═N), 943 (m, N—N), 1371, 861 (w, C═S).
Carbon-bound H-atoms were placed in calculated positions (C–H = 0.98 to 1.00 Å) and were included in the
in the riding model approximation, with Uiso(H) set to 1.2–1.5Ueq(C). The O– and N-bound H-atoms were located in a difference Fourier map and were refined with distance restraints of O—H = 0.84±0.01 Å and N—H 0.88±0.01 Å, and with Uiso(H) = yUeq(parent atom) for y = 1.5 (O) and 1.2 (N).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).C16H17N3OS | F(000) = 632 |
Mr = 299.39 | Dx = 1.309 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 1905 reflections |
a = 14.6966 (8) Å | θ = 2.8–29.3° |
b = 7.3586 (4) Å | µ = 0.22 mm−1 |
c = 14.0926 (8) Å | T = 100 K |
β = 94.358 (5)° | Prism, light-yellow |
V = 1519.66 (15) Å3 | 0.30 × 0.10 × 0.05 mm |
Z = 4 |
Agilent Supernova Dual diffractometer with an Atlas detector | 3375 independent reflections |
Radiation source: SuperNova (Mo) X-ray Source | 2094 reflections with I > 2σ(I) |
Mirror monochromator | Rint = 0.066 |
Detector resolution: 10.4041 pixels mm-1 | θmax = 27.5°, θmin = 2.8° |
ω scans | h = −14→19 |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010) | k = −9→7 |
Tmin = 0.419, Tmax = 1.000 | l = −18→15 |
7614 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)] = 0.060 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.174 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | w = 1/[σ2(Fo2) + (0.0769P)2] where P = (Fo2 + 2Fc2)/3 |
3375 reflections | (Δ/σ)max < 0.001 |
201 parameters | Δρmax = 0.34 e Å−3 |
3 restraints | Δρmin = −0.34 e Å−3 |
C16H17N3OS | V = 1519.66 (15) Å3 |
Mr = 299.39 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 14.6966 (8) Å | µ = 0.22 mm−1 |
b = 7.3586 (4) Å | T = 100 K |
c = 14.0926 (8) Å | 0.30 × 0.10 × 0.05 mm |
β = 94.358 (5)° |
Agilent Supernova Dual diffractometer with an Atlas detector | 3375 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010) | 2094 reflections with I > 2σ(I) |
Tmin = 0.419, Tmax = 1.000 | Rint = 0.066 |
7614 measured reflections |
R[F2 > 2σ(F2)] = 0.060 | 3 restraints |
wR(F2) = 0.174 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | Δρmax = 0.34 e Å−3 |
3375 reflections | Δρmin = −0.34 e Å−3 |
201 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 > 2σ(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 | 0.46230 (5) | 0.24817 (10) | 0.38597 (5) | 0.0188 (2) | |
O1 | 0.21619 (14) | 0.2307 (3) | 0.31997 (15) | 0.0250 (5) | |
H1O | 0.2693 (11) | 0.261 (4) | 0.308 (2) | 0.038* | |
N1 | 0.33770 (15) | 0.3710 (3) | 0.22261 (17) | 0.0182 (6) | |
N2 | 0.42781 (16) | 0.4196 (3) | 0.21980 (18) | 0.0190 (6) | |
H2N | 0.4433 (19) | 0.497 (3) | 0.1764 (16) | 0.023* | |
N3 | 0.57409 (16) | 0.4362 (3) | 0.27942 (17) | 0.0197 (6) | |
H3N | 0.5801 (19) | 0.496 (4) | 0.2259 (13) | 0.024* | |
C1 | 0.1592 (2) | 0.2588 (4) | 0.2410 (2) | 0.0229 (7) | |
C2 | 0.0685 (2) | 0.2066 (5) | 0.2458 (3) | 0.0309 (8) | |
H2 | 0.0496 | 0.1544 | 0.3027 | 0.037* | |
C3 | 0.0062 (2) | 0.2298 (5) | 0.1692 (3) | 0.0331 (9) | |
H3A | −0.0553 | 0.1927 | 0.1732 | 0.040* | |
C4 | 0.0327 (2) | 0.3073 (5) | 0.0857 (3) | 0.0320 (8) | |
H4 | −0.0104 | 0.3236 | 0.0327 | 0.038* | |
C5 | 0.1220 (2) | 0.3603 (4) | 0.0806 (2) | 0.0260 (8) | |
H5A | 0.1396 | 0.4142 | 0.0236 | 0.031* | |
C6 | 0.18777 (19) | 0.3372 (4) | 0.1568 (2) | 0.0200 (7) | |
C7 | 0.28345 (19) | 0.3879 (4) | 0.1464 (2) | 0.0189 (7) | |
C8 | 0.3131 (2) | 0.4548 (4) | 0.0530 (2) | 0.0229 (7) | |
H8A | 0.3795 | 0.4432 | 0.0525 | 0.034* | |
H8B | 0.2957 | 0.5827 | 0.0445 | 0.034* | |
H8C | 0.2834 | 0.3824 | 0.0012 | 0.034* | |
C9 | 0.48965 (19) | 0.3751 (4) | 0.2920 (2) | 0.0174 (7) | |
C10 | 0.65424 (19) | 0.4166 (4) | 0.3422 (2) | 0.0172 (7) | |
C11 | 0.6563 (2) | 0.4776 (4) | 0.4351 (2) | 0.0201 (7) | |
H11 | 0.6024 | 0.5242 | 0.4592 | 0.024* | |
C12 | 0.7355 (2) | 0.4712 (4) | 0.4928 (2) | 0.0252 (7) | |
H12A | 0.7364 | 0.5112 | 0.5570 | 0.030* | |
C13 | 0.8147 (2) | 0.4057 (4) | 0.4568 (2) | 0.0253 (7) | |
H13 | 0.8703 | 0.4035 | 0.4960 | 0.030* | |
C14 | 0.8128 (2) | 0.3441 (4) | 0.3647 (2) | 0.0231 (7) | |
H14 | 0.8671 | 0.2974 | 0.3414 | 0.028* | |
C15 | 0.73287 (19) | 0.3485 (4) | 0.3047 (2) | 0.0195 (7) | |
C16 | 0.7318 (2) | 0.2841 (4) | 0.2034 (2) | 0.0260 (8) | |
H16A | 0.7815 | 0.1969 | 0.1974 | 0.039* | |
H16B | 0.7401 | 0.3882 | 0.1615 | 0.039* | |
H16C | 0.6733 | 0.2253 | 0.1851 | 0.039* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0225 (4) | 0.0163 (4) | 0.0179 (4) | −0.0009 (3) | 0.0039 (3) | −0.0001 (3) |
O1 | 0.0214 (11) | 0.0291 (13) | 0.0247 (13) | −0.0029 (10) | 0.0027 (10) | −0.0005 (10) |
N1 | 0.0150 (12) | 0.0148 (13) | 0.0247 (15) | −0.0010 (10) | 0.0019 (10) | −0.0010 (11) |
N2 | 0.0179 (13) | 0.0166 (14) | 0.0222 (15) | −0.0023 (10) | 0.0002 (11) | 0.0044 (11) |
N3 | 0.0187 (13) | 0.0205 (14) | 0.0199 (15) | −0.0006 (11) | 0.0016 (11) | 0.0052 (11) |
C1 | 0.0245 (16) | 0.0172 (16) | 0.0269 (18) | 0.0046 (13) | 0.0018 (13) | −0.0085 (14) |
C2 | 0.0234 (17) | 0.030 (2) | 0.040 (2) | −0.0028 (14) | 0.0098 (15) | −0.0020 (16) |
C3 | 0.0198 (17) | 0.031 (2) | 0.049 (2) | −0.0018 (14) | 0.0039 (16) | −0.0077 (17) |
C4 | 0.0248 (18) | 0.0298 (19) | 0.040 (2) | 0.0018 (15) | −0.0039 (15) | 0.0006 (17) |
C5 | 0.0242 (17) | 0.0207 (17) | 0.032 (2) | 0.0010 (14) | −0.0026 (14) | −0.0014 (15) |
C6 | 0.0174 (15) | 0.0158 (16) | 0.0266 (18) | −0.0010 (12) | 0.0003 (13) | −0.0037 (13) |
C7 | 0.0209 (15) | 0.0104 (15) | 0.0250 (18) | 0.0038 (12) | 0.0004 (13) | −0.0030 (13) |
C8 | 0.0248 (16) | 0.0192 (17) | 0.0247 (18) | −0.0002 (13) | 0.0021 (13) | −0.0036 (14) |
C9 | 0.0180 (15) | 0.0151 (15) | 0.0197 (16) | 0.0034 (12) | 0.0045 (12) | −0.0028 (13) |
C10 | 0.0185 (15) | 0.0126 (15) | 0.0205 (17) | −0.0006 (12) | 0.0014 (12) | 0.0014 (12) |
C11 | 0.0272 (16) | 0.0095 (14) | 0.0239 (18) | 0.0015 (13) | 0.0045 (13) | −0.0009 (13) |
C12 | 0.0354 (19) | 0.0158 (16) | 0.0235 (18) | −0.0033 (14) | −0.0037 (14) | 0.0013 (14) |
C13 | 0.0249 (17) | 0.0192 (17) | 0.030 (2) | −0.0021 (13) | −0.0091 (14) | 0.0055 (14) |
C14 | 0.0171 (15) | 0.0183 (16) | 0.034 (2) | 0.0001 (13) | 0.0034 (13) | 0.0026 (15) |
C15 | 0.0262 (16) | 0.0132 (15) | 0.0200 (17) | −0.0058 (13) | 0.0063 (13) | −0.0003 (13) |
C16 | 0.0275 (17) | 0.0240 (18) | 0.0276 (19) | −0.0018 (14) | 0.0094 (14) | −0.0020 (14) |
S1—C9 | 1.694 (3) | C6—C7 | 1.473 (4) |
O1—C1 | 1.357 (4) | C7—C8 | 1.500 (4) |
O1—H1O | 0.842 (10) | C8—H8A | 0.9800 |
N1—C7 | 1.295 (4) | C8—H8B | 0.9800 |
N1—N2 | 1.375 (3) | C8—H8C | 0.9800 |
N2—C9 | 1.352 (4) | C10—C11 | 1.383 (4) |
N2—H2N | 0.880 (10) | C10—C15 | 1.400 (4) |
N3—C9 | 1.344 (3) | C11—C12 | 1.369 (4) |
N3—C10 | 1.426 (4) | C11—H11 | 0.9500 |
N3—H3N | 0.882 (10) | C12—C13 | 1.391 (4) |
C1—C2 | 1.394 (4) | C12—H12A | 0.9500 |
C1—C6 | 1.411 (4) | C13—C14 | 1.373 (4) |
C2—C3 | 1.372 (5) | C13—H13 | 0.9500 |
C2—H2 | 0.9500 | C14—C15 | 1.395 (4) |
C3—C4 | 1.390 (5) | C14—H14 | 0.9500 |
C3—H3A | 0.9500 | C15—C16 | 1.503 (4) |
C4—C5 | 1.376 (4) | C16—H16A | 0.9800 |
C4—H4 | 0.9500 | C16—H16B | 0.9800 |
C5—C6 | 1.400 (4) | C16—H16C | 0.9800 |
C5—H5A | 0.9500 | ||
C1—O1—H1O | 108 (2) | H8A—C8—H8B | 109.5 |
C7—N1—N2 | 119.0 (2) | C7—C8—H8C | 109.5 |
C9—N2—N1 | 120.6 (2) | H8A—C8—H8C | 109.5 |
C9—N2—H2N | 119 (2) | H8B—C8—H8C | 109.5 |
N1—N2—H2N | 119.3 (19) | N3—C9—N2 | 113.2 (2) |
C9—N3—C10 | 127.7 (2) | N3—C9—S1 | 124.3 (2) |
C9—N3—H3N | 115.6 (19) | N2—C9—S1 | 122.4 (2) |
C10—N3—H3N | 116.7 (19) | C11—C10—C15 | 121.0 (3) |
O1—C1—C2 | 116.8 (3) | C11—C10—N3 | 120.9 (3) |
O1—C1—C6 | 123.2 (3) | C15—C10—N3 | 117.9 (3) |
C2—C1—C6 | 120.0 (3) | C12—C11—C10 | 120.5 (3) |
C3—C2—C1 | 120.8 (3) | C12—C11—H11 | 119.7 |
C3—C2—H2 | 119.6 | C10—C11—H11 | 119.7 |
C1—C2—H2 | 119.6 | C11—C12—C13 | 119.5 (3) |
C2—C3—C4 | 120.2 (3) | C11—C12—H12A | 120.2 |
C2—C3—H3A | 119.9 | C13—C12—H12A | 120.2 |
C4—C3—H3A | 119.9 | C14—C13—C12 | 120.1 (3) |
C5—C4—C3 | 119.4 (3) | C14—C13—H13 | 120.0 |
C5—C4—H4 | 120.3 | C12—C13—H13 | 120.0 |
C3—C4—H4 | 120.3 | C13—C14—C15 | 121.5 (3) |
C4—C5—C6 | 122.1 (3) | C13—C14—H14 | 119.3 |
C4—C5—H5A | 119.0 | C15—C14—H14 | 119.3 |
C6—C5—H5A | 119.0 | C14—C15—C10 | 117.4 (3) |
C5—C6—C1 | 117.6 (3) | C14—C15—C16 | 121.1 (3) |
C5—C6—C7 | 120.1 (3) | C10—C15—C16 | 121.5 (3) |
C1—C6—C7 | 122.3 (3) | C15—C16—H16A | 109.5 |
N1—C7—C6 | 115.1 (3) | C15—C16—H16B | 109.5 |
N1—C7—C8 | 123.9 (3) | H16A—C16—H16B | 109.5 |
C6—C7—C8 | 120.9 (3) | C15—C16—H16C | 109.5 |
C7—C8—H8A | 109.5 | H16A—C16—H16C | 109.5 |
C7—C8—H8B | 109.5 | H16B—C16—H16C | 109.5 |
C7—N1—N2—C9 | −168.5 (3) | C10—N3—C9—N2 | 178.6 (3) |
O1—C1—C2—C3 | −179.9 (3) | C10—N3—C9—S1 | −3.6 (4) |
C6—C1—C2—C3 | 0.3 (5) | N1—N2—C9—N3 | −178.5 (2) |
C1—C2—C3—C4 | −0.5 (5) | N1—N2—C9—S1 | 3.7 (4) |
C2—C3—C4—C5 | 0.1 (5) | C9—N3—C10—C11 | −56.4 (4) |
C3—C4—C5—C6 | 0.6 (5) | C9—N3—C10—C15 | 129.0 (3) |
C4—C5—C6—C1 | −0.8 (5) | C15—C10—C11—C12 | −0.5 (4) |
C4—C5—C6—C7 | 177.0 (3) | N3—C10—C11—C12 | −174.9 (3) |
O1—C1—C6—C5 | −179.4 (3) | C10—C11—C12—C13 | 1.1 (4) |
C2—C1—C6—C5 | 0.3 (4) | C11—C12—C13—C14 | −1.5 (5) |
O1—C1—C6—C7 | 2.8 (5) | C12—C13—C14—C15 | 1.2 (5) |
C2—C1—C6—C7 | −177.4 (3) | C13—C14—C15—C10 | −0.6 (4) |
N2—N1—C7—C6 | −178.4 (2) | C13—C14—C15—C16 | 178.8 (3) |
N2—N1—C7—C8 | 1.2 (4) | C11—C10—C15—C14 | 0.2 (4) |
C5—C6—C7—N1 | 176.2 (3) | N3—C10—C15—C14 | 174.8 (3) |
C1—C6—C7—N1 | −6.1 (4) | C11—C10—C15—C16 | −179.2 (3) |
C5—C6—C7—C8 | −3.4 (4) | N3—C10—C15—C16 | −4.6 (4) |
C1—C6—C7—C8 | 174.3 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1o···N1 | 0.84 (1) | 1.81 (2) | 2.551 (3) | 145 (3) |
N2—H2n···S1i | 0.88 (1) | 2.51 (2) | 3.323 (2) | 154 (3) |
N3—H3n···S1i | 0.88 (1) | 2.49 (2) | 3.286 (3) | 151 (2) |
C8—H8b···Cg1i | 0.98 | 2.59 | 3.501 (3) | 155 |
Symmetry code: (i) −x+1, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C16H17N3OS |
Mr | 299.39 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 14.6966 (8), 7.3586 (4), 14.0926 (8) |
β (°) | 94.358 (5) |
V (Å3) | 1519.66 (15) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.22 |
Crystal size (mm) | 0.30 × 0.10 × 0.05 |
Data collection | |
Diffractometer | Agilent Supernova Dual diffractometer with an Atlas detector |
Absorption correction | Multi-scan (CrysAlis PRO; Agilent, 2010) |
Tmin, Tmax | 0.419, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7614, 3375, 2094 |
Rint | 0.066 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.060, 0.174, 1.00 |
No. of reflections | 3375 |
No. of parameters | 201 |
No. of restraints | 3 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.34, −0.34 |
Computer programs: CrysAlis PRO (Agilent, 2010), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 2006), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1o···N1 | 0.842 (10) | 1.81 (2) | 2.551 (3) | 145 (3) |
N2—H2n···S1i | 0.880 (10) | 2.508 (16) | 3.323 (2) | 154 (3) |
N3—H3n···S1i | 0.882 (10) | 2.485 (17) | 3.286 (3) | 151 (2) |
C8—H8b···Cg1i | 0.98 | 2.59 | 3.501 (3) | 155 |
Symmetry code: (i) −x+1, y+1/2, −z+1/2. |
Footnotes
‡Additional correspondence author, e-mail: maaffan@yahoo.com.
Acknowledgements
This work was financially supported by the Ministry of Science Technology and Innovation (MOSTI) under a research grant (No. 06–01-09-SF0046). The authors would like to thank Universiti Malaysia Sarawak (UNIMAS) for the facilities to carry out the research work. The authors also thank the University of Malaya for support of the crystallographic facility.
References
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In continuation of structural investigations into the conformation and hydrogen bonding patterns in thiourea derivatives (Normaya et al. 2011; Salam et al., 2011; Dzulkifli et al., 2011), and also motivated by their pharmacological potential (Venkatachalam et al. 2004; Bruce et al., 2007), the title compound, (I), was investigated.
With respect to the planar (r.m.s. = 0.0117 Å) central CN3S chromophore in (I), Fig. 1, the OH– and Me-benzene rings are twisted as seen in the respective dihedral angles of 9.62 (12) and 55.69 (6) °. The almost co-planarity of the central atoms is ascribed to the formation of an intramolecular hydroxyl-O—H···N-imine hydrogen bond, Table 1. The H atoms of the NH groups are syn, and the conformation about the N1═C7 double bond [1.295 (4) Å] is E. The syn arrangement in (I) contrast the anti arrangement often seen in such derivatives but is readily explained in terms of the intramolecular O—H···N-imine hydrogen bond in (I) by contrast to the normally observed intramolecular N—H···N-imine hydrogen bond (Normaya et al. 2011; Salam et al., 2011; Dzulkifli et al., 2011).
Helical supramolecular chains along the b axis dominate the crystal packing, Fig. 2 and Table 1. These arise as a result of the thione-S interacting with both N—H atoms of a neighbouring molecule thereby forming six-membered hydrogen bond mediated rings. Chains are stabilized by C—H..π, Table 1, and π–π [ring centroid(C1···C6)···ring centroid(C10···C15)i = 3.8524 (18) Å, dihedral angle = 2.37 (15) ° for i: 1 - x, -1/2 + y, 1/2 - z] interactions, Fig. 3.