The first member of a new family of tripodal thioether ligands, the methyltris[(alkylthio)methyl]silanes MeSi(CH(2)SR)(3) (R = Me), has been synthesized and characterized. Reactivity studies lead to the isolation of the complete series of group 6 metal carbonyl derivatives {eta(3)-MeSi(CH(2)SMe)(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. {eta(3)-MeSi(CH(2)SMe)(3)}Cr(CO)(3) is monoclinic, P2(1)/c, a = 8.1658(2) Å, b = 15.0563(2) Å, c = 26.5791(3) Å, beta = 90.3653(6) degrees, V = 3267.74(8) Å(3), Z = 8. {eta(3)-MeSi(CH(2)SMe)(3)}Mo(CO)(3) is monoclinic, P2(1)/c, a = 8.34630(6) Å, b = 15.2747(2) Å, c = 27.1865(4) Å, beta = 90.8987(9) degrees, V = 3465.44(10) Å(3), Z = 8. {eta(3)-MeSi(CH(2)SMe)(3)}W(CO)(3) is monoclinic, P2(1)/c, a = 8.1582(2) Å, b = 14.9903(2) Å, c = 26.7268(4) Å, beta = 90.6568(8) degrees, V = 3268.30(9) Å(3), Z = 8.
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