Structural variants of tetranuclear L4Cu4X4. Influence of L on the coordination mode of copper(I)

The synthesis and characterization of Cu2Cl2(C5H8), Cu4Br2Cl2(C7H8)4 and Cu4Br4(C7H8)4 are presented. Cu2Cl2(C5H8) is prepared from the reaction of copper(I) chloride and ethyl vinyl chloride with 1,4-pentadiene. Cu4Br2Cl2(C7H8)4 is generated from the reaction of copper(I) chloride with copper(I) bromide, while Cu4Br4(C7H8)4 is prepared from copper(I) bromide in norbornadiene. The first complex has cubane cores bridged by 1,4-pentadiene ligands to form an infinite ribbon. The second and third complexes are isostructural with Cu4Cl4(C7H8)8.