Synthesis and characterization of non-bridging mono- and bis-σ-η1-alkynyl derivatives of the phosphido-bridged hexaplatinum core [Pt6(μ-PBut2)4(CO)4]2+.

Several mono- or bis-alkynyl derivatives of general formula Pt₆(μ-PBu^t₂)₄(CO)₄X(C≡C–R), Pt₆(μ-PBu^t₂)₄(CO)₄(C≡C–R)₂ or Pt₆(μ-PBu^t₂)₄(CO)₄(C≡C–R)(C≡C–R′) were obtained under Sonogashira type conditions. The new clusters have been characterized with microanalysis and using IR and multinuclear NMR spectroscopy. The crystal and molecular structures of Pt₆(μ-PBu^t₂)₄(CO)₄(C≡C–R)₂ (R = H, C₆H₄-4-n-C₅H₁₁) are presented and electrochemical and spectroelectrochemical studies of some representative compounds are also reported. [ABSTRACT FROM AUTHOR]