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Acta Crystallogr Sect E Struct Rep Online. 2009 May 1; 65(Pt 5): o1082.
Published online 2009 April 22. doi:  10.1107/S1600536809014184
PMCID: PMC2977761

5-(1,3-Dithiolo[4,5-d][1,3]dithiol-2-yl­idene)-1,3-dithiolo[4,5-c][1,2,5]thia­diazole: an unsymmetrical tetra­thia­fulvalene with fused 1,2,5-thia­diazole and 1,3-dithiole rings

Abstract

The title unsymmetrical tetra­thia­fulvalene (TTF), C7H2N2S7, contains fused 1,2,5-thia­diazole and 1,3-dithiole rings and is a component mol­ecule for conducting organic solids. The TTF mol­ecule is disordered crystallographically over two orientations related by an inversion center, where each site is half-occupied. The mol­ecule is almost planar with an r.m.s. deviation of 0.096 Å. In the crystal structure, mol­ecules are linked by short inter­molecular S(...)S inter­actions [3.47 (2), 3.507 (8) and 3.517 (13) Å].

Related literature

For general background, see: Williams et al. (1992 [triangle]); Ishiguro et al. (1998 [triangle]); Yamashita & Tomura (1998 [triangle]). For the synthesis of the title compound, see: Tomura & Yamashita (1997 [triangle]). For unsymmetrical TTF derivatives with a fused 1,2,5-thia­diazole ring, see: Tomura et al. (1993 [triangle]); Underhill et al. (1993 [triangle]); Naito et al. (1996 [triangle]); Tomura & Yamashita (2003 [triangle]); Tomura & Yamashita (2004 [triangle]). For values of van der Waals radii, see: Bondi (1964 [triangle]).

An external file that holds a picture, illustration, etc.
Object name is e-65-o1082-scheme1.jpg

Experimental

Crystal data

  • C7H2N2S7
  • M r = 338.60
  • Monoclinic, An external file that holds a picture, illustration, etc.
Object name is e-65-o1082-efi1.jpg
  • a = 27.42 (3) Å
  • b = 4.051 (3) Å
  • c = 11.047 (10) Å
  • β = 113.020 (15)°
  • V = 1129.4 (18) Å3
  • Z = 4
  • Mo Kα radiation
  • μ = 1.36 mm−1
  • T = 291 K
  • 0.10 × 0.05 × 0.01 mm

Data collection

  • Rigaku/MSC Mercury CCD diffractometer
  • Absorption correction: none
  • 4788 measured reflections
  • 1639 independent reflections
  • 737 reflections with I > 2σ(I)
  • R int = 0.176

Refinement

  • R[F 2 > 2σ(F 2)] = 0.052
  • wR(F 2) = 0.131
  • S = 0.84
  • 1639 reflections
  • 146 parameters
  • 37 restraints
  • H-atom parameters constrained
  • Δρmax = 0.42 e Å−3
  • Δρmin = −0.41 e Å−3

Data collection: CrystalClear (Rigaku/MSC, 2006 [triangle]); cell refinement: CrystalClear; data reduction: TEXSAN (Rigaku, 2004 [triangle]); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 [triangle]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 [triangle]); molecular graphics: PLATON (Spek, 2009 [triangle]); software used to prepare material for publication: SHELXL97.

Supplementary Material

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536809014184/hb2951sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536809014184/hb2951Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Acknowledgments

The authors thank the Instrument Center of the Institute for Molecular Science for the X-ray structure analysis.

supplementary crystallographic information

Comment

Tetrathiafulvalene (TTF) derivatives with a fused 1,2,5-thiadiazole ring have received much attention as component molecules for conducting organic solids (Tomura et al., 1993; Underhill et al., 1993; Naito et al., 1996; Tomura & Yamashita, 2003; Tomura & Yamashita, 2004). Intermolecular interactions caused by S···N and S···S heteroatom contacts may increase the dimensionality in solid states and suppress metal-insulator transitions (Williams et al., 1992; Ishiguro et al., 1998). In addition, such interactions may lead to the formation of unique molecular networks which have special functions such as inclusion properties (Yamashita & Tomura, 1998). We report here the molecular and crystal structure of an unsymmetrical TTF derivative (I), which contains fused 1,2,5-thiadiazole and 1,3-dithiole rings (Fig. 1).

The center of the unsymmetrical TTF molecule (I) is located on an inversion center. Thus, the molecule is disordered crystallographically over two orientations related by the inversion center. Each site is half-occupied and the total site occupation factor (s.o.f.) equals 1.0. This type of disorder was not observed in the crystal of the unsymmetrical tetrathiafulvalene with fused 1,2,5-thiadiazole and 2,3-dihydro-1,4-dioxine rings (Tomura & Yamashita, 2003). Geometric resemblance between 5-membered 1,2,5-thiadiazole and 1,3-dithiole rings causes this disorder in the crystal of (I). Superlattice reflection was not observed on CCD images. This fact also suggests crystallographic disorder in the crystal. The molecular framework is almost planar with an r.m.s. deviation of 0.096 Å from the least-squares plane. The [1,3]dithiolo[4,5-c][1,2,5]thiadiazole framework (S5/S6/S7/N1/N2/C5/C6/C7) is also planar with an r.m.s. deviation of 0.045 Å, while an r.m.s. deviation for the [1,3]dithiolo[4,5-d][1,3]dithiole plane (S1/S2/S3/S4/C1/C2/C3/C4) is large (0.104 Å). The deviations of S3, S4 and C4 atoms from the plane are -0.11 (1), -0.18 (1) and 0.18 (2) Å, respectively. The angle between the two plane is 3.0 (9)°. In the crystal structure, the molecules are linked via short intermolecular S···S interactions [3.517 (13) for S3—S4(x, -y, z - 1/2), 3.47 (2) for S5—S6(x, -y, z - 1/2) and 3.507 (8) Å for S7—S7(-x, -y, -z)] (Fig. 2). The S···S interactions are 2.3–3.6% shorter than the sum of the corresponding van der Waals radii (Bondi, 1964). No short intermolecular S···N interaction was observed.

Experimental

The title compound was synthesized according to the literature method (Tomura & Yamashita, 1997). Greenish-brown plates of (I) were grown from a toluene solution.

Refinement

The molecule (I) was located on an inversion center and was disordered crystallographically over two orientations related by the inversion center. Thus, the occupancy of all atoms was fixed to 0.5. All the H atoms were placed in geometrically calculated positions and refined using a riding model, with C—H = 0.97 Å and Uiso(H) = 1.2Ueq(C). The refinement was slightly unstable, with some oscillating paramter shifts.

Figures

Fig. 1.
The molecular structure of (I), with atom labels and 50% probability displacement ellipsoids for non-H atoms and H atoms are shown as small spheres of arbitrary radii. One component of the disordered molecule is shown.
Fig. 2.
The packing diagram of (I), viewed along the b axis. Dashed lines indicate intermolecular S···S interactions. One component of the disordered molecule is shown.

Crystal data

C7H2N2S7F(000) = 680
Mr = 338.60Dx = 1.991 Mg m3
Monoclinic, C2/cMo Kα radiation, λ = 0.71070 Å
Hall symbol: -C 2ycCell parameters from 1272 reflections
a = 27.42 (3) Åθ = 2.0–30.3°
b = 4.051 (3) ŵ = 1.36 mm1
c = 11.047 (10) ÅT = 291 K
β = 113.020 (15)°Platelet, green–brown
V = 1129.4 (18) Å30.10 × 0.05 × 0.01 mm
Z = 4

Data collection

Rigaku/MSC Mercury CCD diffractometer737 reflections with I > 2σ(I)
Radiation source: Rotating AnodeRint = 0.176
Confocalθmax = 31.0°, θmin = 3.2°
Detector resolution: 14.63 pixels mm-1h = −39→35
[var phi] and ω scansk = −5→5
4788 measured reflectionsl = −15→15
1639 independent reflections

Refinement

Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.052H-atom parameters constrained
wR(F2) = 0.131w = 1/[σ2(Fo2) + (0.0051P)2] where P = (Fo2 + 2Fc2)/3
S = 0.84(Δ/σ)max = 0.135
1639 reflectionsΔρmax = 0.42 e Å3
146 parametersΔρmin = −0.40 e Å3
37 restraintsExtinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
Primary atom site location: structure-invariant direct methodsExtinction coefficient: 0.0064 (8)

Special details

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)

xyzUiso*/UeqOcc. (<1)
S10.3251 (4)0.093 (4)0.1411 (15)0.045 (2)0.50
S20.2922 (4)0.410 (3)−0.1189 (10)0.0329 (12)0.50
S30.4100 (3)0.388 (3)−0.0802 (9)0.0541 (13)0.50
S40.4378 (2)0.0369 (16)0.1767 (6)0.0487 (12)0.50
C10.2792 (6)0.222 (4)0.0102 (19)0.026 (2)0.50
C20.3615 (8)0.325 (7)−0.018 (2)0.045 (5)0.50
C30.3735 (8)0.185 (13)0.091 (4)0.037 (5)0.50
C40.4602 (7)0.284 (6)0.0755 (16)0.114 (12)0.50
H4A0.47520.48620.12220.137*0.50
H4B0.48830.16680.06090.137*0.50
S50.1724 (4)0.394 (4)−0.1612 (15)0.0391 (17)0.50
S60.2003 (4)0.029 (3)0.0999 (10)0.0320 (11)0.50
S70.04227 (19)0.2329 (14)−0.0516 (6)0.0621 (12)0.50
C50.2283 (7)0.206 (4)−0.0082 (19)0.028 (3)0.50
C60.1193 (8)0.320 (12)−0.102 (4)0.042 (5)0.50
C70.1363 (6)0.153 (7)0.031 (2)0.039 (5)0.50
N10.0679 (7)0.362 (5)−0.1582 (19)0.052 (5)0.50
N20.0974 (7)0.090 (9)0.067 (2)0.054 (6)0.50

Atomic displacement parameters (Å2)

U11U22U33U12U13U23
S10.054 (3)0.058 (3)0.021 (4)0.000 (2)0.013 (2)0.002 (3)
S20.025 (3)0.045 (4)0.021 (3)−0.0144 (17)0.0004 (19)−0.0080 (17)
S30.038 (2)0.090 (3)0.0441 (17)−0.002 (2)0.0270 (17)0.005 (2)
S40.0308 (14)0.068 (3)0.0469 (17)0.0016 (18)0.0152 (12)0.004 (2)
C10.027 (4)0.023 (6)0.030 (4)0.015 (4)0.014 (3)−0.006 (4)
C20.045 (9)0.064 (12)0.041 (8)−0.021 (7)0.034 (7)−0.012 (7)
C30.012 (4)0.061 (13)0.030 (7)0.013 (5)−0.002 (4)0.005 (8)
C40.038 (10)0.18 (3)0.113 (18)0.006 (13)0.012 (9)0.035 (17)
S50.0292 (19)0.070 (4)0.017 (3)0.0054 (19)0.0081 (15)0.005 (2)
S60.025 (3)0.044 (4)0.020 (3)−0.0109 (18)0.002 (2)−0.0072 (17)
S70.040 (2)0.084 (3)0.0738 (19)0.008 (2)0.0353 (16)0.020 (2)
C50.031 (5)0.026 (7)0.027 (4)0.020 (4)0.012 (4)0.008 (4)
C60.047 (11)0.054 (15)0.028 (11)−0.008 (11)0.020 (10)−0.002 (8)
C70.024 (7)0.055 (10)0.027 (6)0.017 (7)−0.002 (5)0.017 (6)
N10.034 (6)0.070 (12)0.060 (9)0.007 (6)0.029 (6)0.013 (6)
N20.022 (5)0.105 (11)0.042 (8)0.001 (6)0.019 (4)−0.002 (7)

Geometric parameters (Å, °)

S1—C31.67 (4)C4—H4B0.9700
S1—C11.59 (2)S5—C51.94 (2)
S2—C11.77 (3)S5—C61.84 (3)
S2—C21.82 (2)S6—C71.694 (18)
S3—C21.739 (12)S6—C51.80 (3)
S3—C41.784 (13)S7—N21.669 (15)
S4—C31.749 (13)S7—N11.674 (13)
S4—C41.779 (13)C6—N11.311 (14)
C1—C51.331 (8)C6—C71.52 (4)
C2—C31.25 (4)C7—N21.300 (14)
C4—H4A0.9700
S3···S4i3.517 (13)S7···S7ii3.507 (8)
S5···S6i3.47 (2)
C3—S1—C194.3 (15)S4—C4—H4B108.7
C1—S2—C285.1 (9)H4A—C4—H4B107.6
C2—S3—C490.2 (10)C5—S5—C695.4 (12)
C3—S4—C489.5 (16)C7—S6—C5102.7 (10)
C5—C1—S1122.1 (10)N2—S7—N199.2 (9)
C5—C1—S2115.3 (7)C1—C5—S6127.7 (7)
S1—C1—S2122.5 (12)C1—C5—S5122.6 (8)
C3—C2—S3120 (2)S6—C5—S5109.7 (10)
C3—C2—S2119.6 (16)N1—C6—C7112 (3)
S3—C2—S2120.2 (13)N1—C6—S5132 (3)
C2—C3—S1118.4 (13)C7—C6—S5115.5 (11)
C2—C3—S4120 (3)N2—C7—C6114.0 (17)
S1—C3—S4121 (2)N2—C7—S6129.3 (15)
S3—C4—S4114.4 (11)C6—C7—S6116.1 (13)
S3—C4—H4A108.6C6—N1—S7107 (2)
S4—C4—H4A108.6C7—N2—S7107.0 (13)
S3—C4—H4B108.7
C3—S1—C1—C5179 (2)S1—C1—C5—S5175.1 (18)
C3—S1—C1—S2−3(3)S2—C1—C5—S5−3.0 (11)
C2—S2—C1—C5−179.7 (11)C7—S6—C5—C1170.1 (13)
C2—S2—C1—S12.3 (17)C7—S6—C5—S5−7.9 (15)
C4—S3—C2—C3−12 (4)C6—S5—C5—C1−172.9 (18)
C4—S3—C2—S2175.9 (19)C6—S5—C5—S65(2)
C1—S2—C2—C30(4)C5—S5—C6—N1−174 (4)
C1—S2—C2—S3171.8 (19)C5—S5—C6—C70(3)
S3—C2—C3—S1−174 (3)N1—C6—C7—N2−2(5)
S2—C2—C3—S1−2(6)S5—C6—C7—N2−177 (3)
S3—C2—C3—S4−3(6)N1—C6—C7—S6170 (3)
S2—C2—C3—S4169 (2)S5—C6—C7—S6−5(4)
C1—S1—C3—C23(5)C5—S6—C7—N2179 (3)
C1—S1—C3—S4−168 (3)C5—S6—C7—C68(3)
C4—S4—C3—C216 (5)C7—C6—N1—S74(4)
C4—S4—C3—S1−173 (4)S5—C6—N1—S7178 (4)
C2—S3—C4—S422.8 (18)N2—S7—N1—C6−4(3)
C3—S4—C4—S3−24 (2)C6—C7—N2—S7−1(4)
S1—C1—C5—S6−2.8 (14)S6—C7—N2—S7−172 (2)
S2—C1—C5—S6179.2 (14)N1—S7—N2—C73(3)

Symmetry codes: (i) x, −y, z−1/2; (ii) −x, −y, −z.

Footnotes

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB2951).

References

  • Bondi, A. (1964). J. Phys. Chem.68, 441–451.
  • Ishiguro, T., Yamaji, K. & Saito, G. (1998). Organic Superconductors, edited by P. Fulde, Springer Series Solid-State Science, Vol. 88. Berlin, Heidelberg: Springer.
  • Naito, T., Kobayashi, A., Kobayashi, H. & Underhill, A. E. (1996). Chem. Commun. pp. 521–522.
  • Rigaku (2004). TEXSAN Rigaku Corporation, Tokyo, Japan.
  • Rigaku/MSC (2006). CrystalClear Rigaku/MSC, The Woodlands, Texas, USA.
  • Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. [PubMed]
  • Spek, A. L. (2009). Acta Cryst. D65, 148–155. [PMC free article] [PubMed]
  • Tomura, M., Tanaka, S. & Yamashita, Y. (1993). Heterocycles, 35, 69–72.
  • Tomura, M. & Yamashita, Y. (1997). Synth. Met.86, 1871–1872.
  • Tomura, M. & Yamashita, Y. (2003). Acta Cryst. E59, o145–o147.
  • Tomura, M. & Yamashita, Y. (2004). Acta Cryst. E60, o63–o65.
  • Underhill, A. E., Hawkins, I., Edge, S. & Wilkes, S. B. (1993). Synth. Met.56, 1914–1919.
  • Williams, J. M., Ferraro, J. R., Thorn, R. J., Carlson, K. D., Geiser, U., Wang, H. H., Kini, A. M. & Whangbo, M. H. (1992). Organic Superconductors Englewood Cliffs: Prentice Hall.
  • Yamashita, Y. & Tomura, M. (1998). J. Mater. Chem.8, 1933–1944.

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