A W-Ag-Se cluster compound: (mu(3)-bromo) (mu(3) -tetraselenidotungstide)tris(triphenylphosphinesilver) ethanol solvate, [(mu(3)-Br)(mu(3)-WSe4)(AgPPh3)(3)]center dot EtOH

The title compound, mu 3-bromo-2:3:4 kappa(3)Br-tri-mu(3)-selenido-1:2:3 ka ppa(3)Se;1:2:4 kappa(3)Se;1:3:4 kappa(3)Se-selenido-1 kappa Se- tris(triphe nylphosphine)-2 kappa P,3 kappa P,4 kappa P-trisilvertungsten ethanol solva te, [Ag3WBrSe4(C18H15P)(3)] . C2H5OH, is composed of discrete [(mu(3)-Br)(m u(3)-WSe4)(AgPPh3)(3)] neutral clusters and EtOH molecules. The structure c an be described either as (i) a cubane-like [WAg3Se3Br](2+) cluster core wi th another Se2- ligand bound to the W atom and three PPh3 ligands attached to the three Ag atoms, or as (ii) three Ag(PPh3)(+) fragments linked by one mu(3)-WSe42- and one mu(3)-Br ligand. The average W-Ag bond distance is 3. 01(1) Angstrom, which is too long to be considered a metal-metal interactio n.