6,7-Bis(methylsulfanyl)-2,3-[(3,6,9-trioxaundecane-1,11-diyl)bis(sulfanediylmethylene)]-1,4,5,8-tetrathiafulvalene

In the title compound, C18H26O3S8, the two five-membered rings exhibit envelope conformations. The two S atoms in the 17-membered macrocycle deviate from the plane of the fused five-membered ring by 1.429 (3) and −1.434 (3) Å in opposite directions.

In the title compound, C 18 H 26 O 3 S 8 , the two five-membered rings exhibit envelope conformations. The two S atoms in the 17-membered macrocycle deviate from the plane of the fused five-membered ring by 1.429 (3) and À1.434 (3) Å in opposite directions.
In (I) (Fig. 1), all bond lengths and angles are normal and comparable to those observed in the related structure (Hou et al., 2009). Two five-membered rings have an envelope conformation. Two S atoms in the 17-membered macrocycle deviate from the plane of the fused five-membered ring in opposite directions at 1.429 (3) and -1.434 (3) Å, respectively. The mean planes of two five-membered rings form a dihedral angle of 29.84 (10) °.

Experimental
The title compound was prepared according to the literature (Chen et al., 2005). Single crystals suitable for X-ray diffraction were prepared by slow evaporation a mixture of dichloromethane and petroleum (60-90 °C) at room temperature.

Special details
Experimental. (See detailed section in the paper) Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.