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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2010, 39, 103 - 106, DOI: 10.1039/b917585g

Activation of C–H bonds mediated by MoMo moieties in heterobimetallic Zn/O/Mo clusters

Jian-Gong Ma, Yilmaz Aksu, Laurence J. Gregoriades, Joachim Sauer and Matthias Driess

Heterobimetallic drive and cooperativity lead to a striking scenario for C–H bond activation and heteroaggregation involving MoIII dimers. Reaction of (RO)3MoMo(OR)3 with molar excess of ZnMe2 at–78 °C affords the novel mixed Zn, Mo oxo clusters [Mo2(MeZn)6(2-Me)(3-CH2)2(OR)7] 1 (R = neopentyl) and 2 (R = cyclohexyl) preserving the MoMo triple bond, while the same reaction performed at ambient temperature gives rise to the related cluster [Mo2(MeZn)6(2-CH2)(3-CH2)2(OR)6] 3. These complexes represent the first examples of heterobimetallic MoMo complexes with bridging methyl and methylene groups and agostic C–HMo 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.

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