Tris[(alkylthio)methyl]silanes: Syntheses and Structures of Chromium, Molybdenum, and Tungsten Complexes with a Tripodal Thioether Ligand

The first member of a new family of tripodal thioether ligands, the methyltris[(alkylthio)methyl]silanes MeSi(CH2SR)3 (R = Me), has been synthesized and characterized. Reactivity studies lead to the isolation of the complete
series of group 6 metal carbonyl derivatives {η3-MeSi(CH2SMe)3}M(CO)3 (M = Cr, Mo, W), whose structures
have been determined by single-crystal X-ray diffraction. The three complexes are isomorphous and display distorted
octahedral structures with face-capping tridentate thioether ligands. {η3-MeSi(CH2SMe)3}Cr(CO)3 is monoclinic,
P21/c, a = 8.1658(2) Å, b = 15.0563(2) Å, c = 26.5791(3) Å, β = 90.3653(6)°, V = 3267.74(8) Å3, Z = 8.
{η3-MeSi(CH2SMe)3}Mo(CO)3 is monoclinic, P21/c, a = 8.34630(6) Å, b = 15.2747(2) Å, c = 27.1865(4) Å,
β = 90.8987(9)°, V = 3465.44(10) Å3, Z = 8. {η3-MeSi(CH2SMe)3}W(CO)3 is monoclinic, P21/c, a = 8.1582(2)
Å, b = 14.9903(2) Å, c = 26.7268(4) Å, β = 90.6568(8)°, V = 3268.30(9) Å3, Z = 8.