organic compounds
3,3′-Dibenzoyl-1,1′-dibenzyl-1,1′-(ethane-1,2-diyl)dithiourea
aDepartment of Inorganic Chemistry, Gdansk University of Technology, 11/12 Narutowicza Street, 80-233 Gdańsk, Poland
*Correspondence e-mail: barbara.becker@pg.gda.pl
In the title compound, C32H30N4O2S2, the carbonyl and thiocarbonyl groups are found in a rare synclinal conformation, with an S—C⋯C—O pseudo-torsion angle of 62.6 (2)°. The molecule has Ci = S2 point-group symmetry with a crystallographic center of inversion located in the middle of the ethylene bridge. One of the symmetry-independent phenyl rings is disordered over two orientations, with a site-occupation ratio of 70:30. The distances between the centroids of the nearest phenyl rings are equal to one of the lattice constants [a = 4.7767 (2) Å], so stacking interactions are extremely weak. Molecules are joined by bifurcated hydrogen bonds (N—H⋯O and N—H⋯S), forming a ladder-like arrangement along [100]. combine these ladders into a three-dimensional structure. The dependency between the S⋯O distance and the improper S=C⋯C=O torsion angle based on 739 structures containing the CC(=O)NC(=S)N moiety is discussed.
Related literature
For structures of bis(N-benzoylthioureas) derived from aliphatic diamines, see: Ding et al. (2008); Dong et al. (2007); Sow et al. (2009). For those derived from o-cyclohexanediamine, see: Jumal et al. (2011). For those derived from aromatic diamines, see: Cao et al. (2007); Li et al. (2009); Thiam et al. (2008); Woei Hung & Kassim (2010); Yamin & Osman (2011). For other acyl derivaties obtained from o- and p-phenylenediamine (also solvates), see: Dong, Yan et al. (2008); Dong, Yang et al. (2008); Du & Du (2008); Du et al. (2008). For 1-benzoyl-3-phenylurea, see: Okuniewski et al. (2010). For the synthetic procedure, see: Douglass & Dains (1934). For a review on N-aroylthioureas, see: Aly et al. (2007). For a description of the Cambridge Structural Database, see: Allen (2002).
Experimental
Crystal data
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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: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON (Spek, 2009).
Supporting information
10.1107/S1600536812002954/im2351sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812002954/im2351Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812002954/im2351Isup3.smi
Supporting information file. DOI: 10.1107/S1600536812002954/im2351Isup4.cml
Synthesis was performed according to Douglass & Dains (1934): 2.50 g (33 mmol) of ammonium thiocyanate and 20 ml of acetone were placed in a two-necked flask. Through a dropping funnel 3.49 ml (30 mmol) of benzoyl chloride in 20 ml of acetone was added with stirring. After addition was completed the mixture was refluxed for additional 15 min and then 3.54 ml (15 mmol) of N,N'-dibenzylethane-1,2-diamine in 20 ml of acetone was added through the dropping funnel. The mixture was carefully poured to the 500 ml of water with stirring. The resulting precipitate was filtered on a Büchner funnel. The crude product was recrystallized from acetone. Colorless single crystals suitable for X-ray
were isolated with 72% yield. Melting point: 165 (1)°C.All C-bonded hydrogen atoms were placed in calculated positions (aromatic: dCH = 0.97 Å, methylene: dCH = 0.93 Å) and were treated as riding on their parent atoms with Uiso (H) = 1.2 Ueq(C). H1N atom was located from difference Fourier map and refined isotropically with dNH restrained to 0.88 (1) Å.
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: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON (Spek, 2009).C32H30N4O2S2 | F(000) = 596 |
Mr = 566.72 | Dx = 1.305 Mg m−3 |
Monoclinic, P21/c | Melting point: 438(1) K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 4.7767 (2) Å | Cell parameters from 2955 reflections |
b = 25.1653 (16) Å | θ = 2.3–28.7° |
c = 11.9998 (8) Å | µ = 0.22 mm−1 |
β = 91.585 (5)° | T = 298 K |
V = 1441.91 (15) Å3 | Needle, colourless |
Z = 2 | 0.61 × 0.18 × 0.08 mm |
Oxford Diffraction Xcalibur Sapphire2 (large Be window) diffractometer | 2685 independent reflections |
Graphite monochromator | 2021 reflections with I > 2σ(I) |
Detector resolution: 8.1883 pixels mm-1 | Rint = 0.031 |
ω scans | θmax = 25.5°, θmin = 2.4° |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010) | h = −5→5 |
Tmin = 0.780, Tmax = 1 | k = −26→30 |
7277 measured reflections | l = −14→14 |
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)] = 0.05 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.123 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0551P)2 + 0.2801P] where P = (Fo2 + 2Fc2)/3 |
2685 reflections | (Δ/σ)max = 0.016 |
231 parameters | Δρmax = 0.30 e Å−3 |
163 restraints | Δρmin = −0.15 e Å−3 |
C32H30N4O2S2 | V = 1441.91 (15) Å3 |
Mr = 566.72 | Z = 2 |
Monoclinic, P21/c | Mo Kα radiation |
a = 4.7767 (2) Å | µ = 0.22 mm−1 |
b = 25.1653 (16) Å | T = 298 K |
c = 11.9998 (8) Å | 0.61 × 0.18 × 0.08 mm |
β = 91.585 (5)° |
Oxford Diffraction Xcalibur Sapphire2 (large Be window) diffractometer | 2685 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010) | 2021 reflections with I > 2σ(I) |
Tmin = 0.780, Tmax = 1 | Rint = 0.031 |
7277 measured reflections |
R[F2 > 2σ(F2)] = 0.05 | 163 restraints |
wR(F2) = 0.123 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | Δρmax = 0.30 e Å−3 |
2685 reflections | Δρmin = −0.15 e Å−3 |
231 parameters |
Experimental. CrysAlisPro, Oxford Diffraction Ltd., Version 1.171.33.66 (Oxford Diffraction, 2010) 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 | Occ. (<1) | |
C1 | 1.1371 (4) | 0.58001 (8) | 0.64272 (17) | 0.0356 (5) | |
C3 | 1.0855 (4) | 0.49446 (8) | 0.55324 (16) | 0.0377 (5) | |
H3A | 1.0468 | 0.4587 | 0.5788 | 0.045* | |
H3B | 1.2835 | 0.4967 | 0.5379 | 0.045* | |
C10 | 1.2067 (5) | 0.64605 (9) | 0.7895 (2) | 0.0458 (5) | |
C11 | 1.0914 (5) | 0.69614 (9) | 0.8323 (2) | 0.0528 (6) | |
C12A | 0.882 (3) | 0.7252 (6) | 0.7782 (14) | 0.065 (3) | 0.71 (3) |
H12A | 0.7981 | 0.713 | 0.7121 | 0.078* | 0.71 (3) |
C13A | 0.800 (2) | 0.7731 (4) | 0.8256 (11) | 0.077 (3) | 0.71 (3) |
H13A | 0.6566 | 0.7927 | 0.7911 | 0.092* | 0.71 (3) |
C14A | 0.924 (2) | 0.7922 (3) | 0.9218 (13) | 0.078 (3) | 0.71 (3) |
H14A | 0.8664 | 0.8244 | 0.9513 | 0.093* | 0.71 (3) |
C15A | 1.138 (3) | 0.7634 (4) | 0.9756 (10) | 0.078 (3) | 0.71 (3) |
H15A | 1.2214 | 0.7762 | 1.0413 | 0.093* | 0.71 (3) |
C16A | 1.225 (3) | 0.7153 (5) | 0.9299 (9) | 0.065 (2) | 0.71 (3) |
H16A | 1.3702 | 0.6961 | 0.9638 | 0.077* | 0.71 (3) |
C12B | 0.873 (7) | 0.7181 (15) | 0.769 (3) | 0.075 (7) | 0.29 (3) |
H12B | 0.8008 | 0.6968 | 0.7118 | 0.091* | 0.29 (3) |
C13B | 0.747 (7) | 0.7674 (12) | 0.780 (3) | 0.097 (6) | 0.29 (3) |
H13B | 0.6192 | 0.7814 | 0.7281 | 0.116* | 0.29 (3) |
C14B | 0.831 (7) | 0.7934 (10) | 0.875 (2) | 0.083 (6) | 0.29 (3) |
H14B | 0.7374 | 0.8243 | 0.8941 | 0.099* | 0.29 (3) |
C15B | 1.048 (7) | 0.7760 (10) | 0.943 (3) | 0.080 (7) | 0.29 (3) |
H15B | 1.1111 | 0.7964 | 1.0035 | 0.095* | 0.29 (3) |
C16B | 1.168 (7) | 0.7275 (11) | 0.920 (2) | 0.075 (7) | 0.29 (3) |
H16B | 1.3107 | 0.7155 | 0.9683 | 0.09* | 0.29 (3) |
C20 | 0.8164 (4) | 0.51283 (9) | 0.72178 (18) | 0.0410 (5) | |
H20A | 0.6511 | 0.4995 | 0.6822 | 0.049* | |
H20B | 0.7592 | 0.5421 | 0.7687 | 0.049* | |
C21 | 0.9395 (4) | 0.46935 (9) | 0.79385 (17) | 0.0423 (5) | |
C22 | 1.1471 (6) | 0.48056 (12) | 0.8727 (2) | 0.0678 (8) | |
H22 | 1.2159 | 0.515 | 0.8798 | 0.081* | |
C23 | 1.2529 (6) | 0.44077 (16) | 0.9412 (3) | 0.0881 (10) | |
H23 | 1.395 | 0.4487 | 0.9931 | 0.106* | |
C24 | 1.1543 (7) | 0.39089 (16) | 0.9341 (3) | 0.0861 (11) | |
H24 | 1.2225 | 0.3648 | 0.9826 | 0.103* | |
C25 | 0.9545 (8) | 0.37876 (13) | 0.8557 (3) | 0.0920 (11) | |
H25 | 0.8906 | 0.344 | 0.8487 | 0.11* | |
C26 | 0.8446 (6) | 0.41794 (11) | 0.7858 (2) | 0.0704 (8) | |
H26 | 0.7056 | 0.4093 | 0.733 | 0.085* | |
N1 | 1.0341 (4) | 0.61630 (7) | 0.72100 (16) | 0.0442 (5) | |
N2 | 1.0180 (3) | 0.53247 (7) | 0.64038 (13) | 0.0345 (4) | |
O1 | 1.4457 (3) | 0.63131 (7) | 0.81329 (15) | 0.0619 (5) | |
S1 | 1.38677 (11) | 0.59942 (2) | 0.55656 (5) | 0.0483 (2) | |
H1N | 0.855 (2) | 0.6203 (9) | 0.7200 (19) | 0.053 (7)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0269 (10) | 0.0383 (12) | 0.0413 (12) | 0.0072 (9) | −0.0054 (8) | −0.0019 (9) |
C3 | 0.0358 (11) | 0.0373 (12) | 0.0398 (12) | 0.0061 (9) | −0.0028 (9) | −0.0038 (9) |
C10 | 0.0430 (13) | 0.0431 (13) | 0.0515 (14) | −0.0053 (10) | 0.0050 (10) | −0.0062 (11) |
C11 | 0.0496 (14) | 0.0408 (14) | 0.0692 (17) | −0.0103 (12) | 0.0197 (12) | −0.0113 (12) |
C12A | 0.068 (5) | 0.037 (6) | 0.092 (5) | 0.006 (4) | 0.017 (4) | −0.010 (4) |
C13A | 0.081 (5) | 0.040 (4) | 0.109 (9) | 0.008 (4) | 0.015 (5) | −0.023 (4) |
C14A | 0.074 (7) | 0.047 (4) | 0.114 (9) | −0.003 (4) | 0.021 (6) | −0.036 (5) |
C15A | 0.088 (5) | 0.063 (5) | 0.083 (5) | −0.008 (4) | 0.018 (4) | −0.040 (4) |
C16A | 0.068 (4) | 0.055 (5) | 0.071 (4) | −0.005 (3) | 0.010 (3) | −0.029 (3) |
C12B | 0.086 (12) | 0.035 (9) | 0.108 (14) | −0.010 (8) | 0.051 (11) | −0.003 (9) |
C13B | 0.113 (13) | 0.068 (9) | 0.112 (15) | −0.028 (9) | 0.029 (11) | −0.039 (11) |
C14B | 0.094 (13) | 0.060 (10) | 0.095 (15) | −0.015 (10) | 0.016 (11) | −0.033 (10) |
C15B | 0.089 (18) | 0.060 (13) | 0.090 (12) | −0.012 (11) | 0.015 (12) | −0.014 (11) |
C16B | 0.071 (12) | 0.053 (11) | 0.103 (11) | −0.020 (9) | 0.024 (8) | −0.012 (9) |
C20 | 0.0320 (10) | 0.0471 (13) | 0.0437 (12) | −0.0021 (10) | 0.0012 (9) | −0.0005 (10) |
C21 | 0.0395 (11) | 0.0475 (13) | 0.0403 (12) | 0.0028 (10) | 0.0078 (9) | 0.0014 (10) |
C22 | 0.0624 (16) | 0.0777 (19) | 0.0625 (17) | −0.0047 (14) | −0.0143 (13) | 0.0092 (15) |
C23 | 0.070 (2) | 0.123 (3) | 0.071 (2) | 0.007 (2) | −0.0164 (15) | 0.031 (2) |
C24 | 0.082 (2) | 0.102 (3) | 0.076 (2) | 0.029 (2) | 0.0143 (18) | 0.040 (2) |
C25 | 0.122 (3) | 0.0551 (19) | 0.099 (3) | 0.005 (2) | 0.015 (2) | 0.0219 (18) |
C26 | 0.083 (2) | 0.0545 (17) | 0.073 (2) | −0.0065 (15) | −0.0062 (16) | 0.0080 (14) |
N1 | 0.0290 (9) | 0.0431 (11) | 0.0605 (12) | 0.0037 (8) | 0.0001 (8) | −0.0168 (9) |
N2 | 0.0309 (8) | 0.0370 (10) | 0.0355 (9) | 0.0025 (7) | 0.0006 (7) | −0.0037 (7) |
O1 | 0.0418 (9) | 0.0742 (12) | 0.0691 (12) | 0.0019 (9) | −0.0104 (8) | −0.0170 (9) |
S1 | 0.0406 (3) | 0.0480 (4) | 0.0568 (4) | 0.0003 (3) | 0.0084 (3) | 0.0033 (3) |
C1—N2 | 1.325 (3) | C12B—H12B | 0.93 |
C1—N1 | 1.408 (3) | C13B—C14B | 1.361 (15) |
C1—S1 | 1.673 (2) | C13B—H13B | 0.93 |
C3—N2 | 1.460 (2) | C14B—C15B | 1.374 (17) |
C3—C3i | 1.523 (4) | C14B—H14B | 0.93 |
C3—H3A | 0.97 | C15B—C16B | 1.379 (16) |
C3—H3B | 0.97 | C15B—H15B | 0.93 |
C10—O1 | 1.227 (3) | C16B—H16B | 0.93 |
C10—N1 | 1.370 (3) | C20—N2 | 1.476 (3) |
C10—C11 | 1.474 (3) | C20—C21 | 1.504 (3) |
C11—C16B | 1.362 (16) | C20—H20A | 0.97 |
C11—C12A | 1.386 (7) | C20—H20B | 0.97 |
C11—C12B | 1.387 (18) | C21—C26 | 1.373 (3) |
C11—C16A | 1.403 (8) | C21—C22 | 1.381 (3) |
C12A—C13A | 1.395 (10) | C22—C23 | 1.382 (4) |
C12A—H12A | 0.93 | C22—H22 | 0.93 |
C13A—C14A | 1.371 (9) | C23—C24 | 1.343 (5) |
C13A—H13A | 0.93 | C23—H23 | 0.93 |
C14A—C15A | 1.394 (9) | C24—C25 | 1.356 (4) |
C14A—H14A | 0.93 | C24—H24 | 0.93 |
C15A—C16A | 1.399 (9) | C25—C26 | 1.388 (4) |
C15A—H15A | 0.93 | C25—H25 | 0.93 |
C16A—H16A | 0.93 | C26—H26 | 0.93 |
C12B—C13B | 1.388 (17) | N1—H1N | 0.861 (10) |
N2—C1—N1 | 116.24 (18) | C13B—C14B—C15B | 123 (2) |
N2—C1—S1 | 124.30 (16) | C13B—C14B—H14B | 118.5 |
N1—C1—S1 | 119.40 (16) | C15B—C14B—H14B | 118.5 |
N2—C3—C3i | 110.9 (2) | C14B—C15B—C16B | 118 (2) |
N2—C3—H3A | 109.5 | C14B—C15B—H15B | 120.9 |
C3i—C3—H3A | 109.5 | C16B—C15B—H15B | 120.9 |
N2—C3—H3B | 109.5 | C11—C16B—C15B | 124 (2) |
C3i—C3—H3B | 109.5 | C11—C16B—H16B | 117.9 |
H3A—C3—H3B | 108 | C15B—C16B—H16B | 117.9 |
O1—C10—N1 | 121.0 (2) | N2—C20—C21 | 111.86 (16) |
O1—C10—C11 | 122.1 (2) | N2—C20—H20A | 109.2 |
N1—C10—C11 | 116.9 (2) | C21—C20—H20A | 109.2 |
C16B—C11—C12B | 112 (2) | N2—C20—H20B | 109.2 |
C12A—C11—C16A | 121.1 (8) | C21—C20—H20B | 109.2 |
C16B—C11—C10 | 132.2 (14) | H20A—C20—H20B | 107.9 |
C12A—C11—C10 | 124.0 (7) | C26—C21—C22 | 118.0 (2) |
C12B—C11—C10 | 115.6 (18) | C26—C21—C20 | 121.4 (2) |
C16A—C11—C10 | 114.7 (6) | C22—C21—C20 | 120.5 (2) |
C11—C12A—C13A | 118.2 (10) | C21—C22—C23 | 120.2 (3) |
C11—C12A—H12A | 120.9 | C21—C22—H22 | 119.9 |
C13A—C12A—H12A | 120.9 | C23—C22—H22 | 119.9 |
C14A—C13A—C12A | 121.7 (8) | C24—C23—C22 | 121.2 (3) |
C14A—C13A—H13A | 119.1 | C24—C23—H23 | 119.4 |
C12A—C13A—H13A | 119.1 | C22—C23—H23 | 119.4 |
C13A—C14A—C15A | 120.3 (7) | C23—C24—C25 | 119.5 (3) |
C13A—C14A—H14A | 119.9 | C23—C24—H24 | 120.2 |
C15A—C14A—H14A | 119.9 | C25—C24—H24 | 120.2 |
C14A—C15A—C16A | 119.3 (8) | C24—C25—C26 | 120.4 (3) |
C14A—C15A—H15A | 120.3 | C24—C25—H25 | 119.8 |
C16A—C15A—H15A | 120.3 | C26—C25—H25 | 119.8 |
C15A—C16A—C11 | 119.4 (8) | C21—C26—C25 | 120.5 (3) |
C15A—C16A—H16A | 120.3 | C21—C26—H26 | 119.7 |
C11—C16A—H16A | 120.3 | C25—C26—H26 | 119.7 |
C11—C12B—C13B | 129 (4) | C10—N1—C1 | 122.61 (17) |
C11—C12B—H12B | 115.6 | C10—N1—H1N | 121.7 (16) |
C13B—C12B—H12B | 115.6 | C1—N1—H1N | 115.6 (16) |
C14B—C13B—C12B | 113 (3) | C1—N2—C3 | 120.25 (17) |
C14B—C13B—H13B | 123.5 | C1—N2—C20 | 125.18 (17) |
C12B—C13B—H13B | 123.5 | C3—N2—C20 | 114.56 (16) |
O1—C10—C1—S1 | −62.55 (17) | S1—C1—N1—C10 | −49.1 (3) |
O1—C10—N1—C1 | −24.3 (3) |
Symmetry code: (i) −x+2, −y+1, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O1ii | 0.86 (1) | 2.30 (1) | 3.073 (2) | 150 (2) |
N1—H1N···S1ii | 0.86 (1) | 2.98 (2) | 3.647 (2) | 136 (2) |
Symmetry code: (ii) x−1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C32H30N4O2S2 |
Mr | 566.72 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 298 |
a, b, c (Å) | 4.7767 (2), 25.1653 (16), 11.9998 (8) |
β (°) | 91.585 (5) |
V (Å3) | 1441.91 (15) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.22 |
Crystal size (mm) | 0.61 × 0.18 × 0.08 |
Data collection | |
Diffractometer | Oxford Diffraction Xcalibur Sapphire2 (large Be window) diffractometer |
Absorption correction | Multi-scan (CrysAlis PRO; Oxford Diffraction, 2010) |
Tmin, Tmax | 0.780, 1 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7277, 2685, 2021 |
Rint | 0.031 |
(sin θ/λ)max (Å−1) | 0.606 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.05, 0.123, 1.04 |
No. of reflections | 2685 |
No. of parameters | 231 |
No. of restraints | 163 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.30, −0.15 |
Computer programs: CrysAlis PRO (Oxford Diffraction, 2010), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), OLEX2 (Dolomanov et al., 2009), WinGX (Farrugia, 1999) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O1i | 0.86 (1) | 2.296 (14) | 3.073 (2) | 150 (2) |
N1—H1N···S1i | 0.86 (1) | 2.98 (2) | 3.647 (2) | 136 (2) |
Symmetry code: (i) x−1, y, z. |
Acknowledgements
Financial support from the Polish Ministry of Science and Higher Education (project No. N N204 543339) is gratefully acknowledged.
References
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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.
Substituted N-acylthioureas are the subject of extensive research because of their biological activity, metal coordination ability and hydrogen bond formation (Aly et al., 2007). Bis(N-acylthioureas) are a reatively less studied group with respect to their mono-analogues (Yamin & Osman, 2011).
The title compound, [PhCONHCSN(CH2Ph)CH2]2 (Fig.1), has the inversion center located in the middle of the ethylene bridge, so only half of the molecule is symetrically independent. There is no intramolecular N—H···O hydrogen bond that is commonly present in substituted N-acylthioureas and ureas (Okuniewski et al., 2010), because the hydrogen atom on N2 is substituted by a benzyl group. The only specific interactions are weak bifurcative N—H···O and N—H···S intermolecular hydrogen bonds joining molecules into one-dimensional ladders along [100] (Fig. 2). The three-dimensional structure is only stabilized by van der Waals forces (Fig. 3).
Three main geometries of N-acylthioureas based on the S···O distance (dSO) and the S=C···C=O improper torsion angle (ϕSCCO) can be distinguished: synperiplanar type (i) and (iii) with |ϕSCCO | ≈ 0° as well as antiperiplanar type (ii) with |ϕSCCO | ≈ 180° (Fig. 4). The S···O distance in type (i) is about 3 Å while in type (iii) is about 5 Å. Transition between type (i) and (ii) is smooth and is accomplished by rotation about the thioamide bond. Theoretical relation between dSO and ϕSCCO assuming constant bond lengths and valence angles can be expressed as (see: solid line in Fig. 4):
dSO = (A cos ϕSCCO + B)0.5
where A and B are calculated as:
A = 2 dSC sin αSCN [dCO sin(αNCO + αCNC) – dNC sin αCNC] ≈ -6.4657 Å2
B = [–dCN + dCN cos αCNC – dCO cos(αNCO + αCNC) + dSC cos αSCN]2 + [–dSC sin αSCN]2 + [dNC sin αCNC – dCO sin(αNCO + αCNC)]2 ≈ 13.666 Å2
Numerical values of bond lengths and angles are the average ones calculated in Vista program on the basis of 739 structures (980 values) containing CC(=O)NC(=S)N moiety found in CSD 5.32 (Allen, 2002)
Type (ii) is generally more stable than type (i) due to the formation of the intramolecular N—H···O hydrogen bond. When there is no suitable hydrogen atom to form hydrogen bonds (N,N-disubstituted derivatives) the anticlinal geometry (|ϕSCCO | ≈ 120°) is preferred. Only 58 out of 980 points in Fig. 4 represent type (i) with dSO < 4 Å and |ϕSCCO | < 90°. In this type the S···O distance is slightly greater than theoretical value due to sulfur-oxygen repulsion. Molecules of type (iii) contain covalent six-membered rings (see: structure (iii) in Fig. 4) preventing any rotation, so there is no possibility to transform this type to any other.
Geometric parameters of the title compound's molecule place it near type (i) – rare synclinal conformation with |ϕSCCO| = 62.60 (18)° (see: cross mark in Fig. 4). Large substituents on N2 atom cause type (ii) to be geometrically unfavourable.