Copper(I) halide complexation to norbornene: (CuCl)5(norbornene)4: A complex of novel structure

Abstract

Cu(I) bromide and chloride formπ complexes with norbornene which differ in stoichiometry and copper-halide motif. (CuCl)5(norbornene)4: [triclinic space group P¯1,a=12.138(6),b=22.849(6),c=5.953(1)A,α=90.012(3),β=75.792(3), γ=87.776(4)°,Z=2,R=10.8%, 1365 obs. refl.] displays a structure of new motif in which an eight-membered ring of alternating copper and chloride atoms is bridged by a fifth copper atom which binds to ring chloride atoms in the 1,5 positions and is further bound to a terminal chlorine atom. The four copper atoms of the ring are eachπ bound to a norbornene molecule. [CuBr(norbornene)]4 crystallizes with an eight membered tub shaped ring of alternating copper and bromine atoms having each copper atom bound to a norbornene molecule viaπ donation of the electrons of the double bond.