Organogermanium complexes of molybdenum and tungsten

Infrared and kinetic studies of Group VI metal pentacarbonyl amine compounds

“…Kinetic studies of Mo (CO^amine complexes in solution have shown these complexes to decompose readily yielding Mo(CO)6.1 The decomposition is suggested to proceed by a rate-determining dissociation of the amine, resulting in the production of [Mo(CO)s] as the reactive intermediate (eq 1 and 2).2 In the presence of Lewis bases (L), such as phosphines or arsines, the [Mo (CO) 5] intermediate is trapped in the form of Mo(CO)sL complexes. This substitution process can also occur via an Sn2 process (eq 3).…”

Nucleophilic displacement of transition metal carbonyl anions from metal-metal bonded compounds

“…This is somewhat surprising in view of the fact that (CeH6)3Sn-C1 is not appreciably ionized in this solvent.11 A chemical reaction of (C6H5)3SnCo(CO)4 with the solvent or other decomposition process which might have led to the observed Co(CO)4~w as eliminated by the recovery of 94% of the pure, crystalline compound upon vacuum evaporation of the DMF and recrystallization of the cream-colored residue from hexane. Furthermore, behavior typical of_a strong electrolyte was shown by a plot of AM vs. V C which was linear in the region of C = 0.04M to C = 0.0002 M. Systems 5, 6, and 7 show that pentacarbonylmanganese derivatives dissociate less readily than the corresponding tetracarbonylcobalt systems. The absorptions at 1900 and 1865 cm-1 attributed to Mn-(CO)5_ may be compared with previously reported values of 1898 and 1863 cm-1 for this anion in tetrahydrofuran.12 Good qualitative agreement between the intensities of these bands and the respective molar conductivities lends additional support to this assignment.…”