organic compounds
(E)-1-[2-(Methylsulfanyl)phenyl]-2-({(E)-2-[2-(methylsulfanyl)phenyl]hydrazinylidene}(nitro)methyl)diazene
aDepartment of Chemistry, University of the Free State, PO Box 339, Bloemfontein 9300, South Africa, and bDepartment of Chemistry, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa
*Correspondence e-mail: veschwkg@ufs.ac.za
In the title compound, C15H15N5O2S2, the phenyl rings make dihedral angles of 4.03 (4) and 9.77 (5)° with the plane defined by the central N—N—C—N—N atoms (r.m.s. deviation = 0.010 Å). The C—S—C—C torsion angles of the methylsulfanyl groups with their respective phenyl rings are −7.47 (13) and −72.07 (13)°. The shortest centroid–centroid distance of 3.707 Å occurs between the two π-systems N—N—C—N—N and the benzene ring in the diazene 1-position. The H atom bound to the N atom is involved in intramolecular N—H⋯N and N—H⋯S contacts, while the nitro O atoms are involved in intermolecular C—H⋯O contacts.
Related literature
For the chemistry of dithizone, see: Irving (1977). For related structures, see: Laing (1977); Mito et al. (1997); Gilroy et al. (2008). For the synthesis of nitroformazans, see: Pelkis et al. (1957). For DFT and electrochemistry studies of dithizone, see: von Eschwege & Swarts (2010); von Eschwege, Conradie & Kuhn (2011).
Experimental
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: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97, PLATON (Spek, 2009) and publCIF (Westrip, 2010).
Supporting information
10.1107/S1600536811054080/zq2147sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811054080/zq2147Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536811054080/zq2147Isup3.cml
Solvents (AR) purchased from Merck and reagents from Sigma-Aldrich were used without further purification. The ortho-S-methyl derivative of nitroformazan was prepared according to the procedure reported by Pelkis et al. (1957). M.p. 144 °C. λmax (dichloromethane) 320, 479 nm. δH (600 MHz, CDCl3) 14.76 (1 H, 1 × s, 1 × NH), 2.50 (6 H, 1 × s, 2 × SCH3), 8.03 – 7.34 (8 H, 3 × m, 2 × C6H4)
All hydrogen positions were calculated after each cycle of
using a riding model, with C—H = 0.95 Å and Uiso(H) = 1.2Ueq(C) for aromatic H atoms, with N—H = 0.88 Å and Uiso(H) = 1.2Ueq(N), and with C—H = 0.98 Å and Uiso(H) = 1.5Ueq(C) for methyl H atoms. The H atoms of the methyl groups were allowed to rotate with a fixed angle around the C—C bond to best fit the experimental electron density [HFIX 137 in SHELXL97 (Sheldrick, 2008)].Data collection: APEX2 (Bruker, 2010); cell
SAINT (Bruker, 2010); data reduction: SAINT (Bruker, 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 Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009) and publCIF (Westrip, 2010).C15H15N5O2S2 | F(000) = 752 |
Mr = 361.44 | Dx = 1.499 Mg m−3 |
Monoclinic, P21/c | Melting point: 417 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 4.7283 (2) Å | Cell parameters from 8473 reflections |
b = 17.9791 (10) Å | θ = 2.3–28.3° |
c = 19.3865 (8) Å | µ = 0.35 mm−1 |
β = 103.646 (2)° | T = 200 K |
V = 1601.54 (13) Å3 | Platelet, red |
Z = 4 | 0.79 × 0.21 × 0.07 mm |
Bruker APEXII CCD diffractometer | 3960 independent reflections |
Radiation source: sealed tube | 3301 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.019 |
ϕ and ω scans | θmax = 28.3°, θmin = 2.2° |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | h = −6→5 |
Tmin = 0.870, Tmax = 1.000 | k = −23→23 |
14965 measured reflections | l = −25→25 |
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)] = 0.031 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.086 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0396P)2 + 0.7279P] where P = (Fo2 + 2Fc2)/3 |
3960 reflections | (Δ/σ)max < 0.001 |
219 parameters | Δρmax = 0.31 e Å−3 |
0 restraints | Δρmin = −0.25 e Å−3 |
C15H15N5O2S2 | V = 1601.54 (13) Å3 |
Mr = 361.44 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 4.7283 (2) Å | µ = 0.35 mm−1 |
b = 17.9791 (10) Å | T = 200 K |
c = 19.3865 (8) Å | 0.79 × 0.21 × 0.07 mm |
β = 103.646 (2)° |
Bruker APEXII CCD diffractometer | 3960 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | 3301 reflections with I > 2σ(I) |
Tmin = 0.870, Tmax = 1.000 | Rint = 0.019 |
14965 measured reflections |
R[F2 > 2σ(F2)] = 0.031 | 0 restraints |
wR(F2) = 0.086 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.31 e Å−3 |
3960 reflections | Δρmin = −0.25 e Å−3 |
219 parameters |
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 | −0.33810 (7) | −0.05295 (2) | 0.125542 (19) | 0.02859 (10) | |
S2 | 0.10204 (8) | 0.22354 (2) | 0.39420 (2) | 0.03395 (11) | |
O1 | 0.2660 (3) | −0.13599 (7) | 0.23524 (7) | 0.0451 (3) | |
O2 | 0.6661 (3) | −0.11093 (7) | 0.31138 (6) | 0.0419 (3) | |
N1 | −0.0436 (2) | 0.06137 (7) | 0.24775 (6) | 0.0261 (2) | |
N2 | 0.0632 (2) | −0.00197 (7) | 0.23768 (6) | 0.0254 (2) | |
N3 | 0.4414 (3) | 0.00974 (7) | 0.34898 (6) | 0.0262 (2) | |
N4 | 0.3493 (3) | 0.07389 (7) | 0.36783 (6) | 0.0275 (3) | |
H4 | 0.2011 | 0.0966 | 0.3397 | 0.033* | |
N5 | 0.4207 (3) | −0.09471 (7) | 0.27813 (6) | 0.0288 (3) | |
C1 | −0.6361 (3) | −0.08689 (10) | 0.05684 (8) | 0.0368 (3) | |
H1A | −0.8170 | −0.0839 | 0.0731 | 0.055* | |
H1B | −0.5993 | −0.1387 | 0.0460 | 0.055* | |
H1C | −0.6541 | −0.0565 | 0.0141 | 0.055* | |
C2 | 0.2794 (4) | 0.25326 (9) | 0.32603 (9) | 0.0364 (3) | |
H2A | 0.4660 | 0.2766 | 0.3481 | 0.055* | |
H2B | 0.1553 | 0.2892 | 0.2948 | 0.055* | |
H2C | 0.3132 | 0.2101 | 0.2982 | 0.055* | |
C3 | 0.3021 (3) | −0.02142 (8) | 0.29019 (7) | 0.0244 (3) | |
C11 | −0.2889 (3) | 0.08284 (8) | 0.19544 (7) | 0.0242 (3) | |
C12 | −0.4468 (3) | 0.03812 (8) | 0.13894 (7) | 0.0241 (3) | |
C13 | −0.6941 (3) | 0.07045 (9) | 0.09478 (8) | 0.0292 (3) | |
H13 | −0.8071 | 0.0420 | 0.0569 | 0.035* | |
C14 | −0.7781 (3) | 0.14243 (9) | 0.10470 (8) | 0.0326 (3) | |
H14 | −0.9475 | 0.1623 | 0.0737 | 0.039* | |
C15 | −0.6196 (3) | 0.18619 (9) | 0.15909 (8) | 0.0321 (3) | |
H15 | −0.6756 | 0.2361 | 0.1650 | 0.039* | |
C16 | −0.3795 (3) | 0.15564 (8) | 0.20428 (8) | 0.0292 (3) | |
H16 | −0.2721 | 0.1847 | 0.2425 | 0.035* | |
C21 | 0.4883 (3) | 0.10600 (8) | 0.43295 (7) | 0.0259 (3) | |
C22 | 0.3908 (3) | 0.17503 (8) | 0.45127 (7) | 0.0264 (3) | |
C23 | 0.5239 (3) | 0.20576 (9) | 0.51675 (8) | 0.0328 (3) | |
H23 | 0.4580 | 0.2523 | 0.5301 | 0.039* | |
C24 | 0.7501 (4) | 0.16978 (10) | 0.56265 (8) | 0.0364 (3) | |
H24 | 0.8379 | 0.1913 | 0.6073 | 0.044* | |
C25 | 0.8481 (4) | 0.10248 (10) | 0.54336 (9) | 0.0400 (4) | |
H25 | 1.0057 | 0.0780 | 0.5746 | 0.048* | |
C26 | 0.7182 (4) | 0.07032 (9) | 0.47872 (8) | 0.0371 (4) | |
H26 | 0.7863 | 0.0239 | 0.4657 | 0.045* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.02626 (18) | 0.02805 (19) | 0.02859 (18) | −0.00116 (13) | 0.00074 (13) | −0.00361 (13) |
S2 | 0.02892 (19) | 0.0374 (2) | 0.0351 (2) | 0.01037 (15) | 0.00660 (14) | −0.00065 (15) |
O1 | 0.0362 (6) | 0.0348 (6) | 0.0586 (8) | −0.0037 (5) | −0.0001 (5) | −0.0214 (6) |
O2 | 0.0419 (6) | 0.0366 (6) | 0.0381 (6) | 0.0139 (5) | −0.0090 (5) | −0.0063 (5) |
N1 | 0.0245 (6) | 0.0282 (6) | 0.0231 (5) | −0.0008 (4) | 0.0008 (4) | 0.0003 (5) |
N2 | 0.0238 (5) | 0.0268 (6) | 0.0234 (5) | −0.0031 (4) | 0.0017 (4) | 0.0001 (4) |
N3 | 0.0288 (6) | 0.0227 (6) | 0.0240 (5) | 0.0000 (4) | 0.0003 (4) | −0.0006 (4) |
N4 | 0.0288 (6) | 0.0243 (6) | 0.0244 (6) | 0.0029 (5) | −0.0037 (4) | −0.0018 (5) |
N5 | 0.0322 (6) | 0.0251 (6) | 0.0273 (6) | −0.0010 (5) | 0.0034 (5) | −0.0023 (5) |
C1 | 0.0343 (8) | 0.0377 (9) | 0.0340 (8) | −0.0035 (6) | −0.0008 (6) | −0.0093 (7) |
C2 | 0.0401 (8) | 0.0297 (8) | 0.0382 (8) | 0.0071 (6) | 0.0068 (7) | 0.0080 (6) |
C3 | 0.0261 (6) | 0.0221 (7) | 0.0235 (6) | −0.0010 (5) | 0.0024 (5) | −0.0001 (5) |
C11 | 0.0214 (6) | 0.0281 (7) | 0.0217 (6) | −0.0020 (5) | 0.0026 (5) | 0.0018 (5) |
C12 | 0.0225 (6) | 0.0274 (7) | 0.0223 (6) | −0.0025 (5) | 0.0052 (5) | 0.0011 (5) |
C13 | 0.0251 (7) | 0.0344 (8) | 0.0249 (6) | −0.0026 (5) | −0.0003 (5) | 0.0013 (6) |
C14 | 0.0286 (7) | 0.0358 (8) | 0.0302 (7) | 0.0039 (6) | 0.0006 (5) | 0.0066 (6) |
C15 | 0.0333 (8) | 0.0290 (8) | 0.0330 (7) | 0.0043 (6) | 0.0056 (6) | 0.0028 (6) |
C16 | 0.0294 (7) | 0.0298 (8) | 0.0266 (6) | −0.0012 (6) | 0.0032 (5) | −0.0025 (6) |
C21 | 0.0263 (7) | 0.0252 (7) | 0.0235 (6) | −0.0021 (5) | 0.0003 (5) | −0.0014 (5) |
C22 | 0.0265 (7) | 0.0278 (7) | 0.0248 (6) | −0.0009 (5) | 0.0057 (5) | −0.0001 (5) |
C23 | 0.0393 (8) | 0.0304 (8) | 0.0295 (7) | −0.0020 (6) | 0.0098 (6) | −0.0060 (6) |
C24 | 0.0430 (9) | 0.0376 (9) | 0.0248 (7) | −0.0078 (7) | 0.0002 (6) | −0.0059 (6) |
C25 | 0.0422 (9) | 0.0386 (9) | 0.0303 (7) | 0.0031 (7) | −0.0090 (6) | −0.0022 (7) |
C26 | 0.0413 (8) | 0.0301 (8) | 0.0316 (8) | 0.0070 (6) | −0.0080 (6) | −0.0051 (6) |
S1—C12 | 1.7538 (15) | C11—C16 | 1.400 (2) |
S1—C1 | 1.8018 (15) | C11—C12 | 1.4205 (18) |
S2—C22 | 1.7710 (14) | C12—C13 | 1.4018 (19) |
S2—C2 | 1.8050 (17) | C13—C14 | 1.381 (2) |
O1—N5 | 1.2208 (16) | C13—H13 | 0.9500 |
O2—N5 | 1.2226 (16) | C14—C15 | 1.385 (2) |
N1—N2 | 1.2793 (17) | C14—H14 | 0.9500 |
N1—C11 | 1.4028 (17) | C15—C16 | 1.374 (2) |
N2—C3 | 1.3754 (17) | C15—H15 | 0.9500 |
N3—C3 | 1.3009 (17) | C16—H16 | 0.9500 |
N3—N4 | 1.3148 (17) | C21—C26 | 1.387 (2) |
N4—C21 | 1.4029 (17) | C21—C22 | 1.399 (2) |
N4—H4 | 0.8800 | C22—C23 | 1.391 (2) |
N5—C3 | 1.4720 (18) | C23—C24 | 1.380 (2) |
C1—H1A | 0.9800 | C23—H23 | 0.9500 |
C1—H1B | 0.9800 | C24—C25 | 1.379 (2) |
C1—H1C | 0.9800 | C24—H24 | 0.9500 |
C2—H2A | 0.9800 | C25—C26 | 1.385 (2) |
C2—H2B | 0.9800 | C25—H25 | 0.9500 |
C2—H2C | 0.9800 | C26—H26 | 0.9500 |
C12—S1—C1 | 102.72 (7) | C11—C12—S1 | 121.56 (10) |
C22—S2—C2 | 100.39 (7) | C14—C13—C12 | 121.98 (13) |
N2—N1—C11 | 115.05 (11) | C14—C13—H13 | 119.0 |
N1—N2—C3 | 113.46 (11) | C12—C13—H13 | 119.0 |
C3—N3—N4 | 119.26 (12) | C13—C14—C15 | 121.09 (14) |
N3—N4—C21 | 119.70 (11) | C13—C14—H14 | 119.5 |
N3—N4—H4 | 120.1 | C15—C14—H14 | 119.5 |
C21—N4—H4 | 120.1 | C16—C15—C14 | 118.39 (14) |
O1—N5—O2 | 123.76 (13) | C16—C15—H15 | 120.8 |
O1—N5—C3 | 117.59 (12) | C14—C15—H15 | 120.8 |
O2—N5—C3 | 118.65 (11) | C15—C16—C11 | 121.74 (13) |
S1—C1—H1A | 109.5 | C15—C16—H16 | 119.1 |
S1—C1—H1B | 109.5 | C11—C16—H16 | 119.1 |
H1A—C1—H1B | 109.5 | C26—C21—C22 | 120.22 (13) |
S1—C1—H1C | 109.5 | C26—C21—N4 | 121.02 (13) |
H1A—C1—H1C | 109.5 | C22—C21—N4 | 118.76 (12) |
H1B—C1—H1C | 109.5 | C23—C22—C21 | 118.61 (13) |
S2—C2—H2A | 109.5 | C23—C22—S2 | 119.38 (12) |
S2—C2—H2B | 109.5 | C21—C22—S2 | 122.01 (10) |
H2A—C2—H2B | 109.5 | C24—C23—C22 | 121.13 (14) |
S2—C2—H2C | 109.5 | C24—C23—H23 | 119.4 |
H2A—C2—H2C | 109.5 | C22—C23—H23 | 119.4 |
H2B—C2—H2C | 109.5 | C25—C24—C23 | 119.69 (14) |
N3—C3—N2 | 134.15 (13) | C25—C24—H24 | 120.2 |
N3—C3—N5 | 113.05 (11) | C23—C24—H24 | 120.2 |
N2—C3—N5 | 112.77 (11) | C24—C25—C26 | 120.40 (15) |
C16—C11—N1 | 113.16 (12) | C24—C25—H25 | 119.8 |
C16—C11—C12 | 120.20 (12) | C26—C25—H25 | 119.8 |
N1—C11—C12 | 126.61 (13) | C25—C26—C21 | 119.93 (15) |
C13—C12—C11 | 116.57 (13) | C25—C26—H26 | 120.0 |
C13—C12—S1 | 121.87 (11) | C21—C26—H26 | 120.0 |
C11—N1—N2—C3 | −179.60 (11) | C12—C13—C14—C15 | 0.2 (2) |
C3—N3—N4—C21 | 176.56 (13) | C13—C14—C15—C16 | −1.6 (2) |
N4—N3—C3—N2 | 1.0 (2) | C14—C15—C16—C11 | 1.6 (2) |
N4—N3—C3—N5 | −176.84 (12) | N1—C11—C16—C15 | −178.69 (13) |
N1—N2—C3—N3 | 1.7 (2) | C12—C11—C16—C15 | −0.4 (2) |
N1—N2—C3—N5 | 179.48 (11) | N3—N4—C21—C26 | −1.4 (2) |
O1—N5—C3—N3 | 161.94 (13) | N3—N4—C21—C22 | 178.64 (13) |
O2—N5—C3—N3 | −17.90 (19) | C26—C21—C22—C23 | −1.7 (2) |
O1—N5—C3—N2 | −16.36 (18) | N4—C21—C22—C23 | 178.25 (13) |
O2—N5—C3—N2 | 163.80 (13) | C26—C21—C22—S2 | 179.03 (12) |
N2—N1—C11—C16 | −173.42 (12) | N4—C21—C22—S2 | −1.06 (19) |
N2—N1—C11—C12 | 8.4 (2) | C2—S2—C22—C23 | 108.63 (13) |
C16—C11—C12—C13 | −0.93 (19) | C2—S2—C22—C21 | −72.07 (13) |
N1—C11—C12—C13 | 177.12 (13) | C21—C22—C23—C24 | 0.8 (2) |
C16—C11—C12—S1 | 179.31 (11) | S2—C22—C23—C24 | −179.83 (12) |
N1—C11—C12—S1 | −2.65 (19) | C22—C23—C24—C25 | 0.5 (2) |
C1—S1—C12—C13 | −7.47 (13) | C23—C24—C25—C26 | −0.9 (3) |
C1—S1—C12—C11 | 172.28 (12) | C24—C25—C26—C21 | 0.1 (3) |
C11—C12—C13—C14 | 1.0 (2) | C22—C21—C26—C25 | 1.2 (2) |
S1—C12—C13—C14 | −179.22 (11) | N4—C21—C26—C25 | −178.72 (15) |
D—H···A | D—H | H···A | D···A | D—H···A |
N4—H4···S2 | 0.88 | 2.60 | 3.0248 (13) | 110 |
N4—H4···N1 | 0.88 | 1.99 | 2.6229 (16) | 128 |
C2—H2B···O1i | 0.98 | 2.36 | 3.253 (2) | 151 |
C25—H25···O2ii | 0.95 | 2.45 | 3.1901 (19) | 134 |
Symmetry codes: (i) −x, y+1/2, −z+1/2; (ii) −x+2, −y, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C15H15N5O2S2 |
Mr | 361.44 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 200 |
a, b, c (Å) | 4.7283 (2), 17.9791 (10), 19.3865 (8) |
β (°) | 103.646 (2) |
V (Å3) | 1601.54 (13) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.35 |
Crystal size (mm) | 0.79 × 0.21 × 0.07 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2008) |
Tmin, Tmax | 0.870, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14965, 3960, 3301 |
Rint | 0.019 |
(sin θ/λ)max (Å−1) | 0.668 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.031, 0.086, 1.04 |
No. of reflections | 3960 |
No. of parameters | 219 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.31, −0.25 |
Computer programs: APEX2 (Bruker, 2010), SAINT (Bruker, 2010), SHELXS97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and Mercury (Macrae et al., 2006), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009) and publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
N4—H4···S2 | 0.88 | 2.60 | 3.0248 (13) | 110.4 |
N4—H4···N1 | 0.88 | 1.99 | 2.6229 (16) | 128.2 |
C2—H2B···O1i | 0.98 | 2.36 | 3.253 (2) | 151.1 |
C25—H25···O2ii | 0.95 | 2.45 | 3.1901 (19) | 134.1 |
Symmetry codes: (i) −x, y+1/2, −z+1/2; (ii) −x+2, −y, −z+1. |
Acknowledgements
The research funds of the University of the Free State, the Nelson Mandela Metropolitan University and the National Research Foundation are gratefully acknowledged.
References
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During the synthesis of the versatile trace metal analysis dithizone reagent, aniline is first diazotized and then treated with nitromethane to form the bright orange-red nitroformazan product (Pelkis et al., 1957). Ammonia and hydrogen sulfide gas are used to substitute the nitro group with sulfur towards the formation of dithizone, the chemistry of which is extensively described in the literature (Irving, 1977). Single crystal X-ray structures of nitroformazan derivatives were determined by Gilroy et al. (2008), Mito et al. (1997) and the dithizone structure by Laing (1977), while we performed extensive DFT (von Eschwege et al., 2011) and electrochemistry studies (von Eschwege & Swarts, 2010) on the free ligand.
We recently embarked on a study during which we synthesized a series of electronically altered dithizones for the purpose of investigating its altered redox and structural properties. During this process, crystals of the title compound, suitable for X-ray crystallography, were grown from an acetone solution overlaid with n-hexane.
The least square planes defined by the phenyl rings with respect to the plane defined by the N1, N2, C3, N3 and N4 atoms enclose dihedral angles of 9.77 (5)° and 4.03 (4)° (Fig. 1). The torsion angles of the S-methyl groups with their respective phenyl rings are 7.47 (13)° and 72.07 (13)°. The shortest centroid-centroid distance of 3.707 Å occurs between the two π-systems N1—N2—C3—N3—N4 and C11—C12—C13—C14—C15—C16. The H atom bound to N4 is involved in intramolecular N—H···N and N—H···S contacts while the nitro O atoms have intermolecular C—H···O contacts (Fig. 2). The packing of the title compound in the crystal is shown in Figure 3.