Ru-M heterometallics

As was the case for Fe, stabilizing Ru-Group 4 complexes has benefited from the use of tripodal triamido ligands at the early metal. Several Ru-Ti complexes were formed in salt elimination reactions between K[Ru(CO)2Cp] and a Ti(L)X precursor, where L is a tripodal triamido ligand, such 

The RuMo and RuW analogs were structurally characterized, but only in the case of a mixed porphyrin dimers. The [(TPP)RuMo(OEP)]PFg salt crystallized as two independent molecules in the asymmetric unit. Of interest, one molecule was an eclipsed conformer (torsion angle of 4.4°), while the other exhibited a sta ered geometry (43.5°) [255], The presence of both rotamers implicates a low energy barrier between the two conformations, and a steric energy difference of 5.5 kcal mol  

Proposed catalytic cycle for the dehydrogenation of McjNH BHj with a Zr-Ru heterobimetal- 

93 RUj 2.70 Ru 2.42. Of note, the heteromettJlic mettil-mettJ bonds in RuM + + species are significantly stronger than the homometaUic bonds, including the (d-d) Ru2 species. 

Using a different Ru(Il) metalloligand, [CpRu(q -dmpm)(qUclnipm)]PF5 (where dmpm = dimethylphosphinomethane), the RuPt + complex, [CpRuPt( i-dmpm)2(PPh3)]PFg, was isolated from a reaction with Pt(C2H )(PPh3)2 [264]. The Ru-Pt distance is 2.769(1) A (FSR 1.09), and akin to the RuPd complex, the Group 10 metal is square planar. 

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