One-dimensional butterfly and cubane argento-selenotungstate clusters bridged by bis(diphenylphosphino)ethane ligands

Interaction of [Et4N]2[WSe4], AgBr and bis(diphenylphosphino)ethane (dppe) in a 1:2:1 ratio afforded the polymeric trinuclear cluster {[Et4N][(μ-Br)(μ3-WSe4)Ag2(μ-dppe)]}n (1), while the similar reaction of [Et4N]2[WSe4], AgCl and dppe in a 1:3:1 ratio in the presence of [Et4N]Br gave the polymeric tetranuclear cluster {[Et4N][(μ3-Br)(μ3-WSe4)Ag3Cl(μ-dppe)]}n (2). Two one-dimensional butterfly and cubane-like argento-selenotungstate clusters bridged by dppe ligands were characterized by single crystal X-ray diffraction and the optical limiting properties of polymeric cluster 2 with non-central symmetry were also investigated.