organic compounds
2-[4,5-Bis(butylsulfanyl)-1,3-dithiol-2-ylidene]-5-methyl-5H-1,3-dithiolo[4,5-c]pyrrole-4-carbaldehyde
aKey Laboratory of Natural Resources of Changbai Mountain & Functional Molecules (Yanbian University), Ministry of Education, Yanji 133002, People's Republic of China
*Correspondence e-mail: zqcong@ybu.edu.cn
In the title compound, C18H23NOS6, the dithiolopyrrole ring is almost planar [r.m.s. deviation = 0.044 (3) Å] and makes a dihedral angle of 25.11 (7)° with the dithiole ring. In the crystal, pairs of neighboring molecules are connected by weak intermolecular C—H⋯O interactions. These dimers are further linked into a chain along [110] by C—H⋯O interactions.
Related literature
For background to tetrathiafulvalenes, see: Jeppesen et al. (1999); Hansel et al. (2004). For the synthesis, see: An et al. (2009). For a related structure, see: Leng et al. (2009)
Experimental
Crystal data
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Refinement
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Data collection: RAPID-AUTO (Rigaku, 1998); cell RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S160053681004910X/ng5074sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681004910X/ng5074Isup2.hkl
The title compound was prepared according to literature (An et al., 2009). Crystals suitable for single-crystal X-ray diffraction were grown by recrystallization from mixture of dichloromethane and petroleum (60–90 °C).
Carbon-bound H-atoms were placed in calculated positions with C—H = 0.93–0.97 A and were included in the
in the riding model with Uiso(H) = 1.2 or 1.5 Ueq(C).The tetrathiafulvalenes (TTFs) have become an interesting theme of organic synthesis (Jeppesen et al., 1999). This is due to the high electrical conductivity and super conductor properties of these highly sophisticated compounds. Becher has recently synthesized a series novel donor-π-acceptor dyads based on the monopyrrolo-TTF (MPTTF), which exhibit good third-order non-linear optical properties (Hansel et al. 2004). In this paper, we report the of the title compound, which is a key precursor of the dyads.
The title compound, as shown in Fig. 1, all bond lengths and angles are normal and comparable with those reported for the related structure (Leng et al., 2009). In the title compound, the dithiolopyrrole ring and attached C16, C18 and O1 atoms are nearlly coplanar [mean deviation from the mean plane = 0.044 (3) Å. The dihedral angle between the dithiolopyrrole ring and dithiole ring is 25.11 (7) °. In the crystal, weak C—H···O hydrogen bonds (table 1) link the molecules into dimer firstly and the dimers are further linked to form one-dimensional chain along [a+b] direction.
For background to tetrathiafulvalenes, see: Jeppesen et al. (1999); Hansel et al. (2004). For the synthesis, see: An et al. (2009). For a related structure, see: Leng et al. (2009)
Data collection: RAPID-AUTO (Rigaku, 1998); cell
RAPID-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. The asymmetric of title compound, with the atom numbering. Displacement ellipsoids of non-H atoms are drawn at the 30% probalility level. |
C18H23NOS6 | Z = 2 |
Mr = 461.73 | F(000) = 484 |
Triclinic, P1 | Dx = 1.388 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.4227 (15) Å | Cell parameters from 7048 reflections |
b = 8.8356 (18) Å | θ = 3.2–27.4° |
c = 17.811 (4) Å | µ = 0.63 mm−1 |
α = 93.44 (3)° | T = 291 K |
β = 99.37 (3)° | Block, yellow |
γ = 105.31 (3)° | 0.12 × 0.11 × 0.10 mm |
V = 1105.1 (4) Å3 |
Rigaku R-AXIS RAPID diffractometer | 4956 independent reflections |
Radiation source: fine-focus sealed tube | 3298 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.035 |
ω scans | θmax = 27.5°, θmin = 3.2° |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | h = −9→9 |
Tmin = 0.929, Tmax = 0.940 | k = −11→11 |
10707 measured reflections | l = −23→23 |
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)] = 0.051 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.176 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.103P)2] where P = (Fo2 + 2Fc2)/3 |
4956 reflections | (Δ/σ)max = 0.001 |
238 parameters | Δρmax = 0.51 e Å−3 |
0 restraints | Δρmin = −0.44 e Å−3 |
C18H23NOS6 | γ = 105.31 (3)° |
Mr = 461.73 | V = 1105.1 (4) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.4227 (15) Å | Mo Kα radiation |
b = 8.8356 (18) Å | µ = 0.63 mm−1 |
c = 17.811 (4) Å | T = 291 K |
α = 93.44 (3)° | 0.12 × 0.11 × 0.10 mm |
β = 99.37 (3)° |
Rigaku R-AXIS RAPID diffractometer | 4956 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | 3298 reflections with I > 2σ(I) |
Tmin = 0.929, Tmax = 0.940 | Rint = 0.035 |
10707 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 0 restraints |
wR(F2) = 0.176 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.51 e Å−3 |
4956 reflections | Δρmin = −0.44 e Å−3 |
238 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 | ||
C1 | 1.3588 (7) | 0.8577 (6) | 0.3605 (3) | 0.0992 (16) | |
H1A | 1.4403 | 0.8569 | 0.3239 | 0.149* | |
H1B | 1.4309 | 0.8665 | 0.4113 | 0.149* | |
H1C | 1.3067 | 0.9459 | 0.3554 | 0.149* | |
C2 | 1.2000 (6) | 0.7069 (5) | 0.3463 (2) | 0.0746 (11) | |
H2A | 1.2529 | 0.6206 | 0.3598 | 0.090* | |
H2B | 1.1120 | 0.7139 | 0.3802 | 0.090* | |
C3 | 1.0910 (6) | 0.6676 (5) | 0.2657 (2) | 0.0685 (10) | |
H3A | 1.0039 | 0.5628 | 0.2612 | 0.082* | |
H3B | 1.1798 | 0.6642 | 0.2317 | 0.082* | |
C4 | 0.9789 (5) | 0.7804 (5) | 0.2387 (2) | 0.0612 (9) | |
H4A | 0.9227 | 0.7494 | 0.1851 | 0.073* | |
H4B | 1.0656 | 0.8853 | 0.2429 | 0.073* | |
C5 | 1.0794 (8) | 0.1668 (7) | 0.4134 (3) | 0.1074 (17) | |
H5A | 1.0622 | 0.1460 | 0.3588 | 0.161* | |
H5B | 1.1150 | 0.0815 | 0.4370 | 0.161* | |
H5C | 1.1778 | 0.2634 | 0.4305 | 0.161* | |
C6 | 0.8994 (9) | 0.1813 (7) | 0.4347 (3) | 0.1053 (17) | |
H6A | 0.7974 | 0.0886 | 0.4120 | 0.126* | |
H6B | 0.9111 | 0.1849 | 0.4899 | 0.126* | |
C7 | 0.8498 (7) | 0.3235 (6) | 0.4094 (3) | 0.0837 (13) | |
H7A | 0.8372 | 0.3194 | 0.3542 | 0.100* | |
H7B | 0.9524 | 0.4161 | 0.4317 | 0.100* | |
C8 | 0.6652 (7) | 0.3397 (5) | 0.4319 (2) | 0.0735 (11) | |
H8A | 0.6734 | 0.3350 | 0.4866 | 0.088* | |
H8B | 0.5604 | 0.2521 | 0.4059 | 0.088* | |
C9 | 0.6295 (5) | 0.6022 (4) | 0.26157 (16) | 0.0458 (7) | |
C10 | 0.5642 (5) | 0.4948 (4) | 0.30804 (17) | 0.0483 (7) | |
C11 | 0.4100 (4) | 0.3654 (3) | 0.17027 (16) | 0.0445 (7) | |
C12 | 0.3512 (4) | 0.2543 (3) | 0.10934 (16) | 0.0438 (7) | |
C13 | 0.2413 (4) | −0.0068 (3) | 0.02430 (17) | 0.0440 (7) | |
C14 | 0.3053 (4) | 0.1071 (3) | −0.02319 (16) | 0.0439 (7) | |
C15 | 0.2900 (5) | 0.0300 (4) | −0.09493 (18) | 0.0525 (8) | |
H15 | 0.3207 | 0.0776 | −0.1381 | 0.063* | |
C16 | 0.1719 (6) | −0.2460 (5) | −0.1579 (2) | 0.0688 (10) | |
H16A | 0.0363 | −0.2788 | −0.1743 | 0.103* | |
H16B | 0.2154 | −0.3354 | −0.1440 | 0.103* | |
H16C | 0.2307 | −0.2022 | −0.1989 | 0.103* | |
C17 | 0.1886 (5) | −0.1548 (4) | −0.01838 (19) | 0.0510 (7) | |
C18 | 0.1247 (6) | −0.3038 (4) | 0.0080 (2) | 0.0639 (9) | |
H18 | 0.0960 | −0.3934 | −0.0267 | 0.077* | |
N1 | 0.2228 (4) | −0.1257 (3) | −0.09119 (15) | 0.0526 (7) | |
O1 | 0.1051 (5) | −0.3211 (3) | 0.07376 (16) | 0.0820 (9) | |
S1 | 0.79120 (13) | 0.78869 (10) | 0.29159 (5) | 0.0561 (3) | |
S2 | 0.61844 (16) | 0.52311 (12) | 0.40750 (5) | 0.0659 (3) | |
S3 | 0.38334 (14) | 0.32527 (10) | 0.26366 (5) | 0.0567 (3) | |
S4 | 0.52382 (14) | 0.56342 (9) | 0.16415 (4) | 0.0536 (2) | |
S5 | 0.37538 (13) | 0.30352 (9) | 0.01664 (4) | 0.0524 (2) | |
S6 | 0.24240 (13) | 0.05437 (9) | 0.11878 (4) | 0.0516 (2) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.068 (3) | 0.109 (4) | 0.115 (4) | 0.023 (3) | 0.011 (3) | −0.006 (3) |
C2 | 0.074 (3) | 0.087 (3) | 0.069 (3) | 0.035 (2) | 0.011 (2) | 0.010 (2) |
C3 | 0.073 (3) | 0.068 (2) | 0.066 (2) | 0.018 (2) | 0.023 (2) | −0.0010 (19) |
C4 | 0.061 (2) | 0.070 (2) | 0.0535 (19) | 0.0135 (18) | 0.0181 (17) | 0.0137 (17) |
C5 | 0.099 (4) | 0.107 (4) | 0.122 (5) | 0.039 (3) | 0.027 (3) | −0.005 (3) |
C6 | 0.125 (5) | 0.117 (4) | 0.099 (4) | 0.061 (4) | 0.046 (3) | 0.022 (3) |
C7 | 0.103 (4) | 0.083 (3) | 0.072 (3) | 0.031 (3) | 0.027 (3) | 0.009 (2) |
C8 | 0.094 (3) | 0.082 (3) | 0.050 (2) | 0.032 (2) | 0.012 (2) | 0.0188 (19) |
C9 | 0.0491 (17) | 0.0483 (16) | 0.0380 (15) | 0.0111 (14) | 0.0081 (13) | −0.0007 (12) |
C10 | 0.0561 (19) | 0.0532 (17) | 0.0366 (15) | 0.0176 (15) | 0.0089 (14) | 0.0004 (13) |
C11 | 0.0497 (18) | 0.0417 (15) | 0.0383 (15) | 0.0053 (13) | 0.0094 (13) | 0.0053 (12) |
C12 | 0.0484 (17) | 0.0414 (14) | 0.0378 (14) | 0.0038 (13) | 0.0107 (13) | 0.0066 (12) |
C13 | 0.0437 (16) | 0.0421 (15) | 0.0410 (15) | 0.0058 (13) | 0.0039 (13) | 0.0028 (12) |
C14 | 0.0460 (17) | 0.0414 (15) | 0.0388 (15) | 0.0052 (13) | 0.0042 (13) | 0.0038 (12) |
C15 | 0.060 (2) | 0.0524 (18) | 0.0425 (16) | 0.0105 (16) | 0.0079 (15) | 0.0079 (14) |
C16 | 0.072 (3) | 0.064 (2) | 0.061 (2) | 0.0154 (19) | 0.0018 (19) | −0.0205 (18) |
C17 | 0.0520 (19) | 0.0439 (16) | 0.0504 (18) | 0.0074 (14) | 0.0010 (14) | 0.0021 (13) |
C18 | 0.072 (2) | 0.0439 (17) | 0.069 (2) | 0.0075 (17) | 0.0110 (19) | 0.0014 (16) |
N1 | 0.0560 (17) | 0.0517 (15) | 0.0452 (14) | 0.0140 (13) | 0.0012 (12) | −0.0056 (12) |
O1 | 0.109 (2) | 0.0570 (15) | 0.0691 (18) | 0.0038 (15) | 0.0158 (17) | 0.0148 (13) |
S1 | 0.0593 (5) | 0.0486 (4) | 0.0552 (5) | 0.0078 (4) | 0.0121 (4) | −0.0066 (4) |
S2 | 0.0881 (7) | 0.0735 (6) | 0.0349 (4) | 0.0241 (5) | 0.0069 (4) | 0.0004 (4) |
S3 | 0.0694 (6) | 0.0540 (5) | 0.0389 (4) | 0.0006 (4) | 0.0148 (4) | 0.0056 (3) |
S4 | 0.0736 (6) | 0.0425 (4) | 0.0383 (4) | 0.0066 (4) | 0.0071 (4) | 0.0051 (3) |
S5 | 0.0704 (6) | 0.0412 (4) | 0.0381 (4) | 0.0023 (4) | 0.0097 (4) | 0.0066 (3) |
S6 | 0.0623 (5) | 0.0431 (4) | 0.0422 (4) | −0.0001 (4) | 0.0128 (4) | 0.0074 (3) |
C1—C2 | 1.504 (6) | C9—C10 | 1.342 (5) |
C1—H1A | 0.9600 | C9—S1 | 1.756 (3) |
C1—H1B | 0.9600 | C9—S4 | 1.757 (3) |
C1—H1C | 0.9600 | C10—S2 | 1.739 (3) |
C2—C3 | 1.500 (5) | C10—S3 | 1.767 (3) |
C2—H2A | 0.9700 | C11—C12 | 1.350 (4) |
C2—H2B | 0.9700 | C11—S4 | 1.749 (3) |
C3—C4 | 1.510 (5) | C11—S3 | 1.753 (3) |
C3—H3A | 0.9700 | C12—S5 | 1.757 (3) |
C3—H3B | 0.9700 | C12—S6 | 1.769 (3) |
C4—S1 | 1.818 (3) | C13—C14 | 1.391 (4) |
C4—H4A | 0.9700 | C13—C17 | 1.399 (4) |
C4—H4B | 0.9700 | C13—S6 | 1.734 (3) |
C5—C6 | 1.482 (7) | C14—C15 | 1.385 (4) |
C5—H5A | 0.9600 | C14—S5 | 1.744 (3) |
C5—H5B | 0.9600 | C15—N1 | 1.344 (4) |
C5—H5C | 0.9600 | C15—H15 | 0.9300 |
C6—C7 | 1.475 (7) | C16—N1 | 1.475 (4) |
C6—H6A | 0.9700 | C16—H16A | 0.9600 |
C6—H6B | 0.9700 | C16—H16B | 0.9600 |
C7—C8 | 1.528 (6) | C16—H16C | 0.9600 |
C7—H7A | 0.9700 | C17—N1 | 1.387 (4) |
C7—H7B | 0.9700 | C17—C18 | 1.413 (5) |
C8—S2 | 1.807 (4) | C18—O1 | 1.217 (5) |
C8—H8A | 0.9700 | C18—H18 | 0.9300 |
C8—H8B | 0.9700 | ||
C2—C1—H1A | 109.5 | C7—C8—H8B | 109.3 |
C2—C1—H1B | 109.5 | S2—C8—H8B | 109.3 |
H1A—C1—H1B | 109.5 | H8A—C8—H8B | 107.9 |
C2—C1—H1C | 109.5 | C10—C9—S1 | 125.3 (2) |
H1A—C1—H1C | 109.5 | C10—C9—S4 | 117.4 (2) |
H1B—C1—H1C | 109.5 | S1—C9—S4 | 116.88 (18) |
C3—C2—C1 | 115.1 (4) | C9—C10—S2 | 125.1 (3) |
C3—C2—H2A | 108.5 | C9—C10—S3 | 116.0 (2) |
C1—C2—H2A | 108.5 | S2—C10—S3 | 118.30 (19) |
C3—C2—H2B | 108.5 | C12—C11—S4 | 123.3 (2) |
C1—C2—H2B | 108.5 | C12—C11—S3 | 123.5 (2) |
H2A—C2—H2B | 107.5 | S4—C11—S3 | 113.19 (16) |
C2—C3—C4 | 115.4 (3) | C11—C12—S5 | 121.2 (2) |
C2—C3—H3A | 108.4 | C11—C12—S6 | 121.7 (2) |
C4—C3—H3A | 108.4 | S5—C12—S6 | 117.09 (16) |
C2—C3—H3B | 108.4 | C14—C13—C17 | 108.2 (3) |
C4—C3—H3B | 108.4 | C14—C13—S6 | 118.5 (2) |
H3A—C3—H3B | 107.5 | C17—C13—S6 | 133.4 (3) |
C3—C4—S1 | 114.2 (3) | C15—C14—C13 | 107.6 (3) |
C3—C4—H4A | 108.7 | C15—C14—S5 | 135.4 (2) |
S1—C4—H4A | 108.7 | C13—C14—S5 | 117.0 (2) |
C3—C4—H4B | 108.7 | N1—C15—C14 | 107.9 (3) |
S1—C4—H4B | 108.7 | N1—C15—H15 | 126.0 |
H4A—C4—H4B | 107.6 | C14—C15—H15 | 126.0 |
C6—C5—H5A | 109.5 | N1—C16—H16A | 109.5 |
C6—C5—H5B | 109.5 | N1—C16—H16B | 109.5 |
H5A—C5—H5B | 109.5 | H16A—C16—H16B | 109.5 |
C6—C5—H5C | 109.5 | N1—C16—H16C | 109.5 |
H5A—C5—H5C | 109.5 | H16A—C16—H16C | 109.5 |
H5B—C5—H5C | 109.5 | H16B—C16—H16C | 109.5 |
C7—C6—C5 | 112.5 (5) | N1—C17—C13 | 105.7 (3) |
C7—C6—H6A | 109.1 | N1—C17—C18 | 126.9 (3) |
C5—C6—H6A | 109.1 | C13—C17—C18 | 127.3 (3) |
C7—C6—H6B | 109.1 | O1—C18—C17 | 123.6 (3) |
C5—C6—H6B | 109.1 | O1—C18—H18 | 118.2 |
H6A—C6—H6B | 107.8 | C17—C18—H18 | 118.2 |
C6—C7—C8 | 112.7 (4) | C15—N1—C17 | 110.6 (3) |
C6—C7—H7A | 109.0 | C15—N1—C16 | 124.0 (3) |
C8—C7—H7A | 109.0 | C17—N1—C16 | 125.0 (3) |
C6—C7—H7B | 109.0 | C9—S1—C4 | 101.26 (16) |
C8—C7—H7B | 109.0 | C10—S2—C8 | 102.69 (17) |
H7A—C7—H7B | 107.8 | C11—S3—C10 | 94.65 (15) |
C7—C8—S2 | 111.8 (3) | C11—S4—C9 | 94.30 (15) |
C7—C8—H8A | 109.3 | C14—S5—C12 | 93.61 (14) |
S2—C8—H8A | 109.3 | C13—S6—C12 | 93.09 (14) |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3B···O1i | 0.97 | 2.79 | 3.444 (5) | 125 |
C4—H4A···O1i | 0.97 | 2.71 | 3.368 (5) | 126 |
C18—H18···O1ii | 0.93 | 2.58 | 3.412 (5) | 150 |
Symmetry codes: (i) x+1, y+1, z; (ii) −x, −y−1, −z. |
Experimental details
Crystal data | |
Chemical formula | C18H23NOS6 |
Mr | 461.73 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 291 |
a, b, c (Å) | 7.4227 (15), 8.8356 (18), 17.811 (4) |
α, β, γ (°) | 93.44 (3), 99.37 (3), 105.31 (3) |
V (Å3) | 1105.1 (4) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.63 |
Crystal size (mm) | 0.12 × 0.11 × 0.10 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID |
Absorption correction | Multi-scan (ABSCOR; Higashi, 1995) |
Tmin, Tmax | 0.929, 0.940 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 10707, 4956, 3298 |
Rint | 0.035 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.176, 1.06 |
No. of reflections | 4956 |
No. of parameters | 238 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.51, −0.44 |
Computer programs: RAPID-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3B···O1i | 0.97 | 2.79 | 3.444 (5) | 125.0 |
C4—H4A···O1i | 0.97 | 2.71 | 3.368 (5) | 125.9 |
C18—H18···O1ii | 0.93 | 2.58 | 3.412 (5) | 149.6 |
Symmetry codes: (i) x+1, y+1, z; (ii) −x, −y−1, −z. |
Acknowledgements
The authors acknowledge financial support from the National Natural Science Foundation of China (grant No. 20662010), the Specialized Research Fund for the Doctoral Programme of Higher Education (grant No. 2006184001) and the Open Project of the State Key Laboratory of Supramolecular Structure and Materials, Jilin University.
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The tetrathiafulvalenes (TTFs) have become an interesting theme of organic synthesis (Jeppesen et al., 1999). This is due to the high electrical conductivity and super conductor properties of these highly sophisticated compounds. Becher has recently synthesized a series novel donor-π-acceptor dyads based on the monopyrrolo-TTF (MPTTF), which exhibit good third-order non-linear optical properties (Hansel et al. 2004). In this paper, we report the crystal structure of the title compound, which is a key precursor of the dyads.
The title compound, as shown in Fig. 1, all bond lengths and angles are normal and comparable with those reported for the related structure (Leng et al., 2009). In the title compound, the dithiolopyrrole ring and attached C16, C18 and O1 atoms are nearlly coplanar [mean deviation from the mean plane = 0.044 (3) Å. The dihedral angle between the dithiolopyrrole ring and dithiole ring is 25.11 (7) °. In the crystal, weak C—H···O hydrogen bonds (table 1) link the molecules into dimer firstly and the dimers are further linked to form one-dimensional chain along [a+b] direction.