SYNTHESIS OF BIS(DIPHENYLPHOSPHINOCYCLOPENTADIENYL)YTTRIUM CHLORIDE COMPLEXES AND HETERODIMETALLIC DERIVATIVES - X-RAY STRUCTURE OF IS(DIPHENYLPHOSPHINOCYCLOPENTADIENYL)YTTRIUM(III)]

Reaction of lithium diphenylphosphinocyclopentadienide with YCl3 or YC l3(THF)(3) and working lead to the formation of three yttrocene phosph ines: 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 {(P h(2)PC(5)H(4))(2)Y(mu-Cl)}(2) (2), and the coordinated monometal speci es [(Ph(2)PC(5)H(4))(2)YCl(THF)] (3). The X-ray structure of 2 is rema rkable in that the crystal exhibits two independent chloride-bridged d imers that differ in the arrangement (syn, anti) of the diphenylphosph ino groups. Chelation of phosphorus atoms to a molydenum carbonyl moie ty is also reported.