N,N′-(2,2′-Dithiodi-o-phenyl­ene)bis­(furan-2-carboxamide)

Raftery, J.; Lallbeeharry, H.; Bhowon, M.G.; Laulloo, S.J.; Joule, J.A.

doi:10.1107/S1600536808038828

N,N′-(2,2′-Dithiodi-o-phenylene)bis(furan-2-carboxamide)

J. Raftery, H. Lallbeeharry, M. G. Bhowon, S. J. Laulloo and J. A. Joule

The reaction of 2,2′-dithiobis(benzenamine) with furan-2-carbonyl chloride produced the bis-amide title compound, C₂₂H₁₆N₂O₄S₂, which, in the crystal, formed a helix; the structure consists of two planar furanoylbenzenamines related by an improper rotation of 96.3° about the S—S bond. The N-furanoylbenzenamine units are planar (maximum deviations = 0.316 and 0.132 Å). Each electron-deficient acylfuran stacks (centroid–centroid separations of the two pairs of π–π stacked aromatic rings are 3.918 and 3.953 Å) with the electron-rich benzenamine of the other N-furanoylbenzenamine unit, leading to a spiral structure. The conformation is stabilized by two bifurcated intramolecular N—H

(O,S) interactions.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536808038828/ww2132sup1.cif Contains datablocks I, global
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536808038828/ww2132Isup2.hkl Contains datablock I

CCDC reference: 717245

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Key indicators

Single-crystal X-ray study
T = 100 K
Mean (C-C) = 0.003 Å
R factor = 0.040
wR factor = 0.076
Data-to-parameter ratio = 16.0

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Comment top

We have been interested in the synthesis and properties of potential ligands which can be prepared from 2,2'-dithiobis(benzenamine). From this starting material, one can envisage the preparation of multidentate chelating agents having nitrogen, oxygen and sulfur donor atoms of relevance for the study of various mode of coordination (Okachi et al., 1985; Bhowon et al., 2001; Jhaumeer Laulloo & Bhowon, 2003; Bhowon et al., 2007; Nag et al., 2001; Uma & Palanaindavar, 1993; Bhowon et al., 2005). In the present work 2,2'-dithiobis(benzenamine) N,N'-bis(furan-2-carboxamide) was synthesized (Scheme 1) with a view to examining the stereochemistry of the compound.

The structure (Figure 1) proved to be of considerable interest in adopting a helical structure, the formation of which is driven, we suggest, by the interaction of the furan and benzene units, through space. A furan ring system is normally considered electron-rich, but in this case, carrying a 2-carboxamide unit, it is electron-deficient. The benzene rings, on the other hand, each with a sulfur and a nitrogen substituent, are electron-rich, compared with an unsubstituted benzene. We suggest that interaction of these electronically opposed π-systems, through space, orients the molecule in a helix such that one acyl-furan stacks above the electron-rich benzene located at the other end of the molecule, and the other acyl-furan stacks below the other benzene ring. The second diagram, Figure 2, is a view along the S—S bond. It clearly shows the helical nature of the molecule: the molecule shown has an anticlockwise sense of twist.

The furan ring (C19—C22 and O4), the amide unit (C18, O3, N2), the benzene ring (C12—C17), and S2 are oriented in one plane, which we use as a reference plane (plane 1) (see below). The other benzene ring (C1—C6) (plane 2), the other furan ring (C8—C11 and O2) (plane 3), and the other amide unit (C7, O1, N1) (plane 4), comprise three planes at small dihedral angles one with the other: 2 versus 3 = 18.51°; 3 versus 4 = 13.75°; 2 versus 4 = 11.77°.

The extent to which the reference plane 1 and the three planes of the other 'half' of the molecule are not parallel is small. Quantitatively, this can be measured by the dihedral angles between plane 1 and other three planes: 1 versus 2 = 23.05°; 1 versus 3 = 8.78°; 1 versus 4 = 6.45°. Thus, to a close approximation, the molecule consists of two units (one planar and one close to planar) which are nearly parallel, the largest deviation from which being 23.05° (between the two benzene rings: the extent to which the planes of these can be parallel is constrained by their attachment to the disulfide unit). At the closest points, the distances between the two pairs of stacked furan and benzene aromatic rings are 2.35Å and 3.56Å.

Related literature top

For the preparation of multidentate chelating agents using 2,2'-dithiobis(benzenamine) as starting

material, see: Bhowon et al. (2001, 2005, 2007); Nag et al. (2001); Okachi et al. (1985); Uma & Palanaindavar (1993); Jhaumeer & Bhowon (2003).

Experimental top

A solution of 2-furoyl chloride (0.52 g, 4 mmol) in dioxane (25 ml) was stirred with triethylamine (0.25 ml) for 30 min. To the reaction mixture a solution of bis(2-aminophenyl disulfide) (0.50 g, 2 mmol) in dioxane (15 ml) was added dropwise and the mixture was stirred at room temperature for 3 h. The solution was filtered and on keeping the filtrate for 48 h a solid formed, which was filtered off, the solid washed with water and dried and gave the bis-amide (0.75 g, 84%) as yellow crystals, mp 434 K; δ_H (250 MHz, DMSO-d₆) 6.52-6.54 (2H, m), 6.90-6.97 (2H, t, J 7,1 Hz), 7.17-7.18 (2H, d, J 7 Hz), 7.24-7.30 (2H, dt, J 7,1 Hz), 7.40-7.50 (4H, m), 8.45 (2H, d, J 8 Hz), 9.30 (2H, s); δ_C (250 MHz, DMSO-d₆) 113.4, 115.5, 120.2, 122.8, 124.1, 132.2, 136.7, 139.6, 145.0, 147.6, 155.7; m/z (FAB) 459 (M+Na), 437 (M+H).

Computing details top

Data collection: SMART (Bruker, 2001); cell refinement: SMART (Bruker, 2001); data reduction: SAINT (Bruker, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

	Fig. 1. View of (I) (50% probability displacement ellipsoids).
	Fig. 2. View of (I) along the S—S bond showing the sense of twist (50% probability displacement ellipsoids).
	Fig. 3. The formation of the title compound.

N,N'-(2,2'-Dithiodi-o-phenylene)bis(furan-2-carboxamide) top

Crystal data top

C₂₂H₁₆N₂O₄S₂	Z = 2
M_r = 436.49	F(000) = 452
Triclinic, P1	D_x = 1.489 Mg m⁻³
Hall symbol: -P 1	Melting point: 434 K
a = 9.6173 (11) Å	Mo Kα radiation, λ = 0.71073 Å
b = 9.9210 (11) Å	Cell parameters from 1625 reflections
c = 11.9906 (14) Å	θ = 2.3–27.2°
α = 109.770 (2)°	µ = 0.31 mm⁻¹
β = 103.748 (2)°	T = 100 K
γ = 104.643 (2)°	Plate, yellow
V = 973.84 (19) Å³	0.45 × 0.30 × 0.20 mm

Data collection top

Bruker SMART APEX diffractometer	2911 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	R_int = 0.029
Graphite monochromator	θ_max = 28.3°, θ_min = 1.9°
ϕ and ω scans	h = −11→12
6177 measured reflections	k = −12→12
4327 independent reflections	l = −12→15

Refinement top

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)] = 0.040	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.076	H-atom parameters constrained
S = 0.83	w = 1/[σ²(F_o²) + (0.0233P)²] where P = (F_o² + 2F_c²)/3
4327 reflections	(Δ/σ)_max < 0.001
271 parameters	Δρ_max = 0.37 e Å⁻³
0 restraints	Δρ_min = −0.30 e Å⁻³

Crystal data top

C₂₂H₁₆N₂O₄S₂	γ = 104.643 (2)°
M_r = 436.49	V = 973.84 (19) Å³
Triclinic, P1	Z = 2
a = 9.6173 (11) Å	Mo Kα radiation
b = 9.9210 (11) Å	µ = 0.31 mm⁻¹
c = 11.9906 (14) Å	T = 100 K
α = 109.770 (2)°	0.45 × 0.30 × 0.20 mm
β = 103.748 (2)°

Data collection top

Bruker SMART APEX diffractometer	2911 reflections with I > 2σ(I)
6177 measured reflections	R_int = 0.029
4327 independent reflections

Refinement top

R[F² > 2σ(F²)] = 0.040	0 restraints
wR(F²) = 0.076	H-atom parameters constrained
S = 0.83	Δρ_max = 0.37 e Å⁻³
4327 reflections	Δρ_min = −0.30 e Å⁻³
271 parameters

Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
C1	0.0310 (2)	0.5459 (2)	0.2881 (2)	0.0182 (5)
C2	−0.0923 (2)	0.4603 (2)	0.3075 (2)	0.0222 (5)
H2	−0.1147	0.5039	0.3816	0.027*
C3	−0.1820 (2)	0.3115 (3)	0.2187 (2)	0.0260 (5)
H3	−0.2684	0.2539	0.2301	0.031*
C4	−0.1452 (2)	0.2476 (3)	0.1137 (2)	0.0254 (5)
H4	−0.2047	0.1440	0.0547	0.031*
C5	−0.0240 (2)	0.3304 (2)	0.0922 (2)	0.0210 (5)
H5	−0.0006	0.2842	0.0191	0.025*
C6	0.0639 (2)	0.4823 (2)	0.1783 (2)	0.0175 (5)
C7	0.2528 (2)	0.5374 (2)	0.0722 (2)	0.0191 (5)
C8	0.3733 (2)	0.6694 (2)	0.08069 (19)	0.0177 (5)
C9	0.4744 (2)	0.6804 (2)	0.0208 (2)	0.0208 (5)
H9	0.4866	0.5977	−0.0400	0.025*
C10	0.5592 (2)	0.8391 (2)	0.0659 (2)	0.0269 (5)
H10	0.6394	0.8836	0.0412	0.032*
C11	0.5045 (2)	0.9148 (2)	0.1501 (2)	0.0276 (5)
H11	0.5404	1.0235	0.1946	0.033*
C12	0.4601 (2)	0.7032 (2)	0.45289 (19)	0.0175 (5)
C13	0.4594 (2)	0.5616 (2)	0.37237 (19)	0.0175 (5)
C14	0.5733 (2)	0.5626 (2)	0.3192 (2)	0.0205 (5)
H14	0.5755	0.4683	0.2652	0.025*
C15	0.6830 (2)	0.7001 (2)	0.3446 (2)	0.0247 (5)
H15	0.7581	0.6993	0.3055	0.030*
C16	0.6855 (2)	0.8386 (2)	0.4259 (2)	0.0249 (5)
H16	0.7629	0.9323	0.4441	0.030*
C17	0.5740 (2)	0.8393 (2)	0.4805 (2)	0.0221 (5)
H17	0.5758	0.9341	0.5374	0.027*
C18	0.3246 (2)	0.2766 (2)	0.27812 (19)	0.0193 (5)
C19	0.1878 (2)	0.1613 (2)	0.2705 (2)	0.0193 (5)
C20	0.1276 (2)	0.0073 (2)	0.2061 (2)	0.0259 (5)
H20	0.1682	−0.0548	0.1537	0.031*
C21	−0.0076 (2)	−0.0446 (2)	0.2314 (2)	0.0267 (5)
H21	−0.0758	−0.1480	0.1991	0.032*
C22	−0.0201 (2)	0.0812 (2)	0.3100 (2)	0.0270 (5)
H22	−0.1007	0.0805	0.3429	0.032*
N1	0.18360 (17)	0.57613 (18)	0.15935 (16)	0.0187 (4)
H1	0.2194	0.6744	0.2112	0.022*
N2	0.34384 (17)	0.42539 (18)	0.34788 (15)	0.0180 (4)
H2A	0.2740	0.4374	0.3823	0.022*
O1	0.21966 (16)	0.40672 (16)	−0.00702 (15)	0.0279 (4)
O2	0.39021 (15)	0.81377 (15)	0.16313 (14)	0.0227 (3)
O3	0.41169 (15)	0.23672 (16)	0.22600 (14)	0.0271 (4)
O4	0.09859 (15)	0.21068 (15)	0.33633 (14)	0.0229 (4)
S1	0.14557 (6)	0.73663 (6)	0.40340 (5)	0.02100 (14)
S2	0.31812 (6)	0.70909 (6)	0.52536 (5)	0.02075 (14)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0161 (11)	0.0201 (11)	0.0206 (12)	0.0088 (9)	0.0042 (9)	0.0111 (10)
C2	0.0192 (11)	0.0301 (13)	0.0244 (13)	0.0125 (10)	0.0089 (10)	0.0160 (11)
C3	0.0201 (12)	0.0325 (14)	0.0292 (14)	0.0062 (11)	0.0092 (11)	0.0195 (11)
C4	0.0221 (12)	0.0248 (13)	0.0222 (13)	0.0013 (10)	0.0014 (10)	0.0113 (11)
C5	0.0206 (12)	0.0230 (12)	0.0165 (12)	0.0062 (10)	0.0039 (10)	0.0081 (10)
C6	0.0164 (11)	0.0209 (12)	0.0188 (12)	0.0084 (9)	0.0049 (9)	0.0124 (10)
C7	0.0189 (11)	0.0231 (12)	0.0197 (12)	0.0112 (10)	0.0064 (10)	0.0118 (10)
C8	0.0187 (11)	0.0166 (11)	0.0154 (11)	0.0071 (9)	0.0037 (9)	0.0051 (9)
C9	0.0224 (12)	0.0223 (12)	0.0209 (12)	0.0108 (10)	0.0101 (10)	0.0094 (10)
C10	0.0249 (13)	0.0296 (13)	0.0303 (14)	0.0088 (11)	0.0133 (11)	0.0157 (11)
C11	0.0293 (13)	0.0172 (12)	0.0301 (14)	−0.0004 (10)	0.0119 (11)	0.0084 (11)
C12	0.0188 (11)	0.0220 (12)	0.0135 (11)	0.0092 (9)	0.0049 (9)	0.0087 (9)
C13	0.0189 (11)	0.0192 (11)	0.0135 (11)	0.0076 (9)	0.0025 (9)	0.0078 (9)
C14	0.0213 (12)	0.0230 (12)	0.0188 (12)	0.0106 (10)	0.0072 (10)	0.0089 (10)
C15	0.0213 (12)	0.0297 (13)	0.0280 (14)	0.0111 (10)	0.0108 (11)	0.0150 (11)
C16	0.0218 (12)	0.0206 (12)	0.0317 (14)	0.0051 (10)	0.0068 (11)	0.0140 (11)
C17	0.0242 (12)	0.0183 (12)	0.0226 (13)	0.0100 (10)	0.0047 (10)	0.0080 (10)
C18	0.0217 (11)	0.0205 (12)	0.0132 (11)	0.0091 (10)	0.0025 (10)	0.0058 (9)
C19	0.0199 (11)	0.0214 (12)	0.0168 (12)	0.0104 (10)	0.0070 (10)	0.0059 (10)
C20	0.0274 (13)	0.0214 (12)	0.0229 (13)	0.0079 (10)	0.0087 (11)	0.0033 (10)
C21	0.0269 (13)	0.0189 (12)	0.0267 (14)	0.0034 (10)	0.0066 (11)	0.0065 (11)
C22	0.0232 (12)	0.0266 (13)	0.0326 (14)	0.0061 (10)	0.0116 (11)	0.0149 (11)
N1	0.0201 (9)	0.0137 (9)	0.0188 (10)	0.0031 (8)	0.0067 (8)	0.0052 (8)
N2	0.0183 (9)	0.0185 (10)	0.0170 (10)	0.0077 (8)	0.0077 (8)	0.0057 (8)
O1	0.0297 (9)	0.0186 (8)	0.0307 (10)	0.0066 (7)	0.0153 (8)	0.0035 (7)
O2	0.0251 (8)	0.0186 (8)	0.0218 (9)	0.0048 (7)	0.0122 (7)	0.0051 (7)
O3	0.0283 (9)	0.0227 (8)	0.0306 (10)	0.0107 (7)	0.0162 (8)	0.0068 (7)
O4	0.0237 (8)	0.0202 (8)	0.0244 (9)	0.0080 (7)	0.0113 (7)	0.0073 (7)
S1	0.0238 (3)	0.0201 (3)	0.0221 (3)	0.0114 (2)	0.0109 (3)	0.0080 (2)
S2	0.0248 (3)	0.0218 (3)	0.0155 (3)	0.0092 (2)	0.0085 (2)	0.0063 (2)

Geometric parameters (Å, º) top

C1—C2	1.392 (3)	C12—S2	1.7871 (19)
C1—C6	1.403 (3)	C13—C14	1.392 (3)
C1—S1	1.777 (2)	C13—N2	1.402 (2)
C2—C3	1.383 (3)	C14—C15	1.380 (3)
C2—H2	0.9500	C14—H14	0.9500
C3—C4	1.378 (3)	C15—C16	1.380 (3)
C3—H3	0.9500	C15—H15	0.9500
C4—C5	1.380 (3)	C16—C17	1.382 (3)
C4—H4	0.9500	C16—H16	0.9500
C5—C6	1.393 (3)	C17—H17	0.9500
C5—H5	0.9500	C18—O3	1.224 (2)
C6—N1	1.403 (2)	C18—N2	1.366 (2)
C7—O1	1.224 (2)	C18—C19	1.469 (3)
C7—N1	1.368 (2)	C19—C20	1.344 (3)
C7—C8	1.468 (3)	C19—O4	1.369 (2)
C8—C9	1.343 (3)	C20—C21	1.415 (3)
C8—O2	1.380 (2)	C20—H20	0.9500
C9—C10	1.415 (3)	C21—C22	1.340 (3)
C9—H9	0.9500	C21—H21	0.9500
C10—C11	1.341 (3)	C22—O4	1.366 (2)
C10—H10	0.9500	C22—H22	0.9500
C11—O2	1.367 (2)	N1—H1	0.8800
C11—H11	0.9500	N2—H2A	0.8800
C12—C17	1.382 (3)	S1—S2	2.0768 (8)
C12—C13	1.407 (3)

C2—C1—C6	120.24 (19)	N2—C13—C12	119.02 (17)
C2—C1—S1	119.34 (17)	C15—C14—C13	120.27 (19)
C6—C1—S1	120.42 (15)	C15—C14—H14	119.9
C3—C2—C1	119.9 (2)	C13—C14—H14	119.9
C3—C2—H2	120.0	C14—C15—C16	121.12 (19)
C1—C2—H2	120.0	C14—C15—H15	119.4
C4—C3—C2	119.50 (19)	C16—C15—H15	119.4
C4—C3—H3	120.2	C15—C16—C17	119.2 (2)
C2—C3—H3	120.2	C15—C16—H16	120.4
C3—C4—C5	121.6 (2)	C17—C16—H16	120.4
C3—C4—H4	119.2	C12—C17—C16	120.5 (2)
C5—C4—H4	119.2	C12—C17—H17	119.7
C4—C5—C6	119.6 (2)	C16—C17—H17	119.7
C4—C5—H5	120.2	O3—C18—N2	125.09 (19)
C6—C5—H5	120.2	O3—C18—C19	120.47 (18)
C5—C6—N1	122.76 (19)	N2—C18—C19	114.43 (18)
C5—C6—C1	119.09 (18)	C20—C19—O4	110.13 (18)
N1—C6—C1	118.14 (18)	C20—C19—C18	131.36 (19)
O1—C7—N1	124.76 (19)	O4—C19—C18	118.50 (17)
O1—C7—C8	121.70 (19)	C19—C20—C21	106.93 (19)
N1—C7—C8	113.54 (18)	C19—C20—H20	126.5
C9—C8—O2	110.26 (18)	C21—C20—H20	126.5
C9—C8—C7	132.45 (19)	C22—C21—C20	106.23 (19)
O2—C8—C7	117.28 (17)	C22—C21—H21	126.9
C8—C9—C10	106.59 (18)	C20—C21—H21	126.9
C8—C9—H9	126.7	C21—C22—O4	110.92 (18)
C10—C9—H9	126.7	C21—C22—H22	124.5
C11—C10—C9	106.89 (18)	O4—C22—H22	124.5
C11—C10—H10	126.6	C7—N1—C6	129.57 (17)
C9—C10—H10	126.6	C7—N1—H1	115.2
C10—C11—O2	110.59 (18)	C6—N1—H1	115.2
C10—C11—H11	124.7	C18—N2—C13	129.03 (17)
O2—C11—H11	124.7	C18—N2—H2A	115.5
C17—C12—C13	120.33 (18)	C13—N2—H2A	115.5
C17—C12—S2	119.14 (15)	C11—O2—C8	105.66 (16)
C13—C12—S2	120.49 (15)	C22—O4—C19	105.80 (15)
C14—C13—N2	122.53 (18)	C1—S1—S2	103.80 (7)
C14—C13—C12	118.45 (19)	C12—S2—S1	104.78 (7)

C6—C1—C2—C3	0.5 (3)	C15—C16—C17—C12	−0.8 (3)
S1—C1—C2—C3	−179.76 (15)	O3—C18—C19—C20	−5.0 (4)
C1—C2—C3—C4	2.2 (3)	N2—C18—C19—C20	175.9 (2)
C2—C3—C4—C5	−2.5 (3)	O3—C18—C19—O4	176.19 (18)
C3—C4—C5—C6	0.1 (3)	N2—C18—C19—O4	−2.9 (3)
C4—C5—C6—N1	−176.52 (18)	O4—C19—C20—C21	0.4 (3)
C4—C5—C6—C1	2.6 (3)	C18—C19—C20—C21	−178.5 (2)
C2—C1—C6—C5	−2.9 (3)	C19—C20—C21—C22	−0.4 (3)
S1—C1—C6—C5	177.37 (15)	C20—C21—C22—O4	0.2 (3)
C2—C1—C6—N1	176.30 (17)	O1—C7—N1—C6	−0.5 (3)
S1—C1—C6—N1	−3.5 (2)	C8—C7—N1—C6	179.00 (18)
O1—C7—C8—C9	−6.0 (4)	C5—C6—N1—C7	−11.6 (3)
N1—C7—C8—C9	174.5 (2)	C1—C6—N1—C7	169.31 (19)
O1—C7—C8—O2	172.76 (18)	O3—C18—N2—C13	2.0 (3)
N1—C7—C8—O2	−6.8 (3)	C19—C18—N2—C13	−178.95 (18)
O2—C8—C9—C10	−0.6 (2)	C14—C13—N2—C18	3.7 (3)
C7—C8—C9—C10	178.2 (2)	C12—C13—N2—C18	−176.88 (19)
C8—C9—C10—C11	0.0 (2)	C10—C11—O2—C8	−1.0 (2)
C9—C10—C11—O2	0.6 (3)	C9—C8—O2—C11	1.0 (2)
C17—C12—C13—C14	−1.6 (3)	C7—C8—O2—C11	−178.06 (18)
S2—C12—C13—C14	−179.28 (15)	C21—C22—O4—C19	0.0 (2)
C17—C12—C13—N2	178.93 (18)	C20—C19—O4—C22	−0.3 (2)
S2—C12—C13—N2	1.2 (3)	C18—C19—O4—C22	178.75 (18)
N2—C13—C14—C15	178.88 (19)	C2—C1—S1—S2	90.48 (16)
C12—C13—C14—C15	−0.6 (3)	C6—C1—S1—S2	−89.74 (16)
C13—C14—C15—C16	2.1 (3)	C17—C12—S2—S1	88.52 (16)
C14—C15—C16—C17	−1.4 (3)	C13—C12—S2—S1	−93.76 (16)
C13—C12—C17—C16	2.3 (3)	C1—S1—S2—C12	84.72 (10)
S2—C12—C17—C16	−179.97 (16)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N2—H2A···S2	0.88	2.52	3.0104 (16)	116
N2—H2A···O4	0.88	2.24	2.688 (2)	111
N1—H1···S1	0.88	2.50	2.9805 (18)	115
N1—H1···O2	0.88	2.19	2.651 (2)	112

Experimental details

Crystal data
Chemical formula	C₂₂H₁₆N₂O₄S₂
M_r	436.49
Crystal system, space group	Triclinic, P1
Temperature (K)	100
a, b, c (Å)	9.6173 (11), 9.9210 (11), 11.9906 (14)
α, β, γ (°)	109.770 (2), 103.748 (2), 104.643 (2)
V (Å³)	973.84 (19)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	0.31
Crystal size (mm)	0.45 × 0.30 × 0.20

Data collection
Diffractometer	Bruker SMART APEX diffractometer
Absorption correction	–
No. of measured, independent and observed [I > 2σ(I)] reflections	6177, 4327, 2911
R_int	0.029
(sin θ/λ)_max (Å⁻¹)	0.667

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.040, 0.076, 0.83
No. of reflections	4327
No. of parameters	271
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.37, −0.30

Computer programs: SMART (Bruker, 2001), SAINT (Bruker, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).