Dithiolates 4,5-dithiolato-1,3-dithiol-2-thione

Several complexes between tin(rv) centers and the l,3-dithiole-2-thione-4,5-dithiolato or l,3-dithiole-2-one-4,5-dithiolato ligands have been prepared by Wardel s group by methathesis reactions involving addition, elimination, and substitution at the metal atom (Scheme 5) C1998POL4475, 1999JOM140>. 

Compound Me2Sn(DMIT) (24b) and orthorhombic Et2Sn(DMTT) (24c) are linked into chains as a result of intermolecular S(thione) —Sn interactions. The tin centers are pentacoordinate with distorted TBP geometries. The intermolecular S — Sn bonds of 3.001 and 2.960 A in the two independent molecules of 24b, and 3.008 A in 24c at 150 K (3.037 A at 298 K), are considerably longer than the covalent Sn bonds to the dithiolato Sax and Seq atoms between 2.440 and 2.523 A (Table 5). As expected, the axial dithiolate— tin bond of 2.523 A is longer than the equatorial bond, 2.459 A. The distortions from ideal trigonal-bipyramidal arrays in 24a-c are not the result of the presence of the chelate, since the chelate bite angles are near 90° in all cases. 

Thione-l,3-dithiole-benzo [Pg.469]

Figure 3 Examples of molecular conductor building blocks. TTF, tetrathiofulvalene TSF, tetraselena-fulvalene TMTSF, tetramethyltetraselenafulvalene TCNQ, tetracyanoquinodimethane BEDT-TTF, bis-ethylene-dithio-tetrathiofulvalene EDT-TTF, ethylene-dithio-tetrathiofulvalene dmit, dimercaptoisotri-thione or 2-thioxo-l,3-dithiole-4,5-dithiolato dmise, 2-selenoxo-l,3-dithiole-4,5-dithiolato dddt, 5,6-dihydro-...

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