(Pentamethylcyclopentadienyl)molybdenum(IV) Chloride. Synthesis, Structure, and Properties

Syntheses and structures of molybdenum and tungsten pentabenzylcyclopentadienyl complexes: new chlorination reactions

“…The reaction of equimolar amounts of 2a and PhI Á Cl 2 led to the synthesis of [Mo(CpBz)(CO) 3 Cl], 5, whereas the use of an excess of PhI Á Cl 2 gave [Mo(CpBz)Cl 4 ], 6. These results show that the reactivity of [Mo(CpBz)CO) 3 CH 3 ] with PhI Á Cl 2 pursue via (i) the replacement of a Me by a Cl ligand and (ii) decarbonylation of the metal centre in consequence of its oxidation, a pattern that has been commonly observed for similar complexes [7,17].…”

Reduction of [Mo2O5] by mercaptopropionic acid in an aqueous medium. Isolation and characterization of a dinuclear oxo- and 3-sulfido-proprionato(2-)-bridged molybdenum(IV) compound

“…Rather, these peaks could correspond to minor fragmentation pathways involving the elimination of SCH 2 CH 2 CO (m/z 88), thereby leaving an oxo bridge on the dinuclear complex. (3) Mo (2) [28] and Cp à 2 Mo 2 X 4 (l-X) 2 (X = Cl, Br) [29,30]. It probably involves alkylsulfido bridges rather than hydroxo bridges, since the former groups are generally better bridging ligands.…”

Preparation of trichloro- and tribromocyclopentadienyltungsten(IV)

“…For the heavier Group 6 metals (Mo and W), systems with the metal in the oxidation states V, (Ring)MX 4 (Ring= Cp or substituted analogue) [2 -5], and III, [(Ring)MX 2 ] 2 [5 -8], have been known for some time. The corresponding systems of Mo(IV), [(Ring)MoX 3 ] 2 , have been more recently developed [9][10][11][12][13]. Here, we report on the corresponding development of the previously unknown systems of W(IV).…”

“…The W compound has a tendency to maximize the metal-metal bonding at the expense of metal-ligand bonding. The structure of [Cp*MoX 3 ] 2 (X=Cl, Br) was shown to be of type III with no direct metal-metal bonding interaction and the compounds show magnetic properties consistent with antiferromagnetic coupling between two S= 1 d 2 metal centers [11,12]. This structure is also found for the corresponding d 1 -d 1 Ta(IV) system, [(h 5 -C 5 Me 4 Et)TaBr 3 ] 2 [14], which similarly has no metalmetal bond.…”