The preparation of [M2Cp2(CO)4(μ-η2-PE)] (E = As or Sb), the first complexes with naked heterodiatomic Group 15 ligands, and of their adducts with W(CO)5
Abstract
Addition of one equivalent of the Group 15 trichlorides ECl3 (E = P, As, or Sb) to the phosphido-bridged dimetallic anions [M2Cp2(CO)4(μ-PH2)]− (M = Mo or W) afforded moderate yields of the complexes [M2Cp2(CO)4(μ-η2-PE)], which feature a pseudo-tetrahedral M2PE core. Treatment of the new complexes with [W(CO)5(THF)] led to preferential co-ordination of this Lewis acid to the phosphorus atom. The additional co-ordination of a W(CO)5 fragment to the As atom in [M2Cp2(CO)4(μ-η2-PAs)] to give a 2∶1 adduct is reversible at room temperature on dissolution in