Triple bridged anionic dimetallic complexes from cis-[Mo(η3-methallyl)Cl(CO)2(NCMe)2] and pyrazolates

The reactions of cis-[Mo(η3-methallyl)Cl(CO)2(NCMe)2] and 0.5 equivalents of tetra-n-butylammonium salts of pyrazolate (pz), 3,5-dimethylpyrazolate (dmpz) or indazolate (inz) lead to NnBu4[{Mo(η3-methallyl)(CO)2(μ-Cl)}2(μ-pz*)] (pz* = pz, dmpz, inz), where the bridging pyrazolato is coordinated trans to the allyl group and both bridging chlorido ligands are coordinated trans to the carbonyls.

The substitution of acetonitriles in the title compound has been so far focussed on neutral ligands, whereas its reactivity toward anionic ligands is practically unexplored. The coordination of pyrazolates is herein described, which gives rise to not very common triple bridged anionic dimetallic complexes.Figure optionsDownload as PowerPoint slideHighlights
► The substitution of acetonitriles in the title complex toward anionic ligands is practically unexplored.
► There are not previous reports on pyrazolates bridging two “Mo(η3-allyl)(CO)2” moieties.
► Clean conversion of terminal to bridging chlorido is not common.