Abstract
A general synthetic route to electron rich half-sandwich tungsten(IV) complexes with a series of 4,4′-disubstituted 2,2′-bipyridyl (R2bipy) donor ligands of the type [WIVCp*(R2bipy)Cl3] has been elaborated. The crystal structure and conductivity measurements of the R = methyl derivative evidenced quite weak bonding of the chloride ligands in these complexes. This propensity has been utilized to prepare the novel square pyramidal, 16e– Lewis acid [WCp*(Me2bipy)Cl2]+BPh4– through halide abstraction from [WCp*(Me2bipy)Cl3] with NaBPh4. The crystal structures of the cationic complex and its 18e– CO adduct [WCp*(Me2bipy)(CO)Cl2]+BPh4– obtained through carbon monoxide addition to the former have been determined.
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