Synthesis of bis(diphenylphosphinocyclopentadienyl)yttrium chloride complexes and heterodimetallic derivatives. X-ray structure of bis[(mu-chloro)bis(diphenylphosphinocyclopentadienyl)yttrium(III)]

Reaction of lithium diphenylphosphinocyclopentadienide with YCl3 or YCl3(THF)(3) and working lead to the formation of three yttrocene phosphines: the lithium metal adduct isolated as (Ph(2)PC(5)H(4))(2)Y(mu-Cl)(2)Li(THF)(2) . 0.5 LiCl (1), the chloride-bridged dimeric species {(Ph(2)PC(5)H(4))(2)Y(mu-Cl)}(2) (2), and the coordinated monometal species [(Ph(2)PC(5)H(4))(2)YCl(THF)] (3). The X-ray structure of 2 is remarkable in that the crystal exhibits two independent chloride-bridged dimers that differ in the arrangement (syn, anti) of the diphenylphosphino groups. Chelation of phosphorus atoms to a molydenum carbonyl moiety is also reported.