Inorganic Chemistry, Vol.42, No.20, 6160-6162, 2003
Synthesis and structural characterization of cationic rhenium(V) and technetium(V) dioxo complexes containing four N-heterocyclic carbene ligands
Cationic dioxorhenium and dioxotechnetium complexes of the composition [MO2(L-1)(4)](+) (L-1 = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) have been prepared from various starting materials and studied spectroscopically and by X-ray crystallography. The metal-carbon distances range from 2.216(4) to 2.232(4) Angstrom indicating mainly sigma-bonding.