Synthesis and Structure of Cyclopentadienylmolybdenum Tricarbonylate Complexes of Y and Yb

The heterobimetallic complex [(G)Y(m-CO)MoCp(CO)] (1) was obtained by the salt metathesis reaction of equimolar amounts of the yttrium bis-guanidinate chloride complex (G)Y(μ-Cl)Li(THF) and Na[CpMo(CO)] in a yield of 72%. The reaction of the monoamidinide bisalkyl derivative of yttrium AmdY(CHSiMe)(THF) with two equivalents of molybdenum hydride CpMo(CO)H, accompanied by the elimination of SiMe, also made it possible to obtain the heterobimetallic complex [AmdY(THF){(m-CO)MoCp(CO)(μ-CO)MoCp(CO)}] (2), the yield of which was 66%. Using the interaction of the naphthalene complex (CH)Yb(THF) with CpMo(CO)H in a molar ratio of 1:2 it was shown that the method can also be used to synthesize the heterobimetallic complex of divalent ytterbium [Yb(THF){(m-CO)MoCp(CO)}] (3). X-ray analysis revealed that complexes 1-3 contain a tetranuclear heterobimetallic skeleton LnMo in which the Y or Yb ions are linked to molybdenum ions by bridging isocarbonyl groups, while complex 3 is a coordination polymer.