Influence of the group 11 metal on the emissive properties of complexes [M{(PR2)2C2B9H10}L]

Abstract

The metal atoms in group 11 complexes [M{(PR₂)₂C₂B₉H₁₀}L] [R = Ph, ⁱPr; L = tertiary phosphane; M = Au, Ag, Cu] play an important role in the emissive properties of these compounds. The influence of the metal follows the order Au ≫ Ag ≥ Cu. The three-coordinated complexes are obtained from the reaction of [AuClL], [Ag(OTf)L], or [Cu(NO₃)(PPh₃)₂] with the closo carborane diphosphane in refluxing ethanol. For L = PPh₂NHPy, cleavage of the P–N bond and the formation of the monophosphane PPh₂OEt are observed, depending on the metal and the nido carborane diphosphane substituent (ⁱPr or Ph).