(Pentamethylcyclopentadienyl)molybdenum Bromides and Iodides

Contrary to the (pentamethylcyclopentadienyl)trichloromolybdenum(IV) system, for which the molecular [Cp{sup *}MoCl{sub 2{minus}}({mu}-Cl)]{sub 2} complex is the only form observed, the corresponding chemistry of the heavier halide systems is much more complex. Three compounds or mixtures of compounds that correspond to the overall stoichiometry {open_quotes}Cp{sup *}MoX{sub 3}{close_quotes} (X=Br,I) can exist in the solid state and/or in solution [A = Cp{sup *}{sub 2}Mo{sub 2}X{sub 4}({mu}-X){sub 2}; B = ([Cp{sup *}{sub 2}Mo{sub 2}({mu}X){sub 4}]{sup +}[Cp{sup *}MoX{sub 4}]{sup {minus}} + Cp{sup *}MoX{sub 4}); C= [Cp{sup *}{sub 2}Mo{sub 2}({mu}-X){sub 4}]{sup +}(X{sup {minus}}){sub 0.5}(X{sub 3}{sup {minus}}){sub .05}], and various combinations of them can be obtained depending on the halide nature, synthetic method and reaction conditions.