Luminescence behavior of polynuclear alkynylcopper(I) phosphines

A series of soluble trinuclear and tetranuclear copper(I) complexes contain ing mu(3)-eta(1) acetylides [Cu-3(mu-dppm)(3)(mu(3)-eta(1)-C equivalent to CR)](2+), [Cu-3(mu-dppm)(3)(mu(3)-mu(1)-C equivalent to CR)(2)](+) and [Cu- 4(PPh3)(4)(mu(3)-eta(1)-C equivalent to CR)(4)] have been synthesized and s hown to exhibit rich photoluminescent behaviour at room temperature. The el ectrochemistry of the trinuclear Cu(I) acetylide: complexes and the excited - state redox properties of [Cu-3(mu-dppm)(3)(mu(3)-eta(1)-C equivalent to CC6H4OMe-p)(2)](+) have been investigated. The X-ray crystal structures of [Cu-3(mu-dppm)(3)(mu(3)-eta(1)-C equivalent to CC6H4OMe-p)(2)](+) and [Cu-4 (PPh3)(4)(mu(3)-eta(1)-C equivalent to CC6H4OMe-p)(4)] have been determined .