Activation of C-H bonds mediated by Mo[triple bond]Mo moieties in heterobimetallic Zn/O/Mo clusters.
Heterobimetallic drive and cooperativity lead to a striking scenario for C-H bond activation and heteroaggregation involving Mo(III) dimers. Reaction of (RO)(3)Mo[triple bond]Mo(OR)(3) with molar excess of ZnMe(2) at-78 degrees C affords the novel mixed Zn, Mo oxo clusters [Mo(2)(MeZn)(6)(mu(2)-Me)(mu(3)-CH(2))(2)(OR)(7)] 1 (R = neopentyl) and 2 (R = cyclohexyl) preserving the Mo[triple bond]Mo triple bond, while the same reaction performed at ambient temperature gives rise to the related cluster [Mo(2)(MeZn)(6)(mu(2)-CH(2))(mu(3)-CH(2))(2)(OR)(6)] 3. These complexes represent the first examples of heterobimetallic Mo[triple bond]Mo complexes with bridging methyl and methylene groups and agostic C-H-->Mo interactions, as well as penta-coordinate carbon. The complexes 1-3 were characterized by elemental analyses, multinuclear NMR and single-crystal X-ray diffraction analysis.
Ma
Jian-Gong
JG
Institute of Chemistry: Metalorganics and Inorganic Materials, Sekr. C2, Technische Universität Berlin, Strasse des 17. Juni 135, D-10623, Berlin, Germany.
Aksu
Yilmaz
Y
Gregoriades
Laurence J
LJ
Sauer
Joachim
J
Driess
Matthias
M