COPPER DISORDERED HEXAKIS(PHENYL-ETHYNYL)PENTAARGENTATE(I) CLUSTER

The X-ray single-crystal structure determination of an anionic cluster, [Ag4.46CU0.54(C8H5)(6)], with bis(triphenylphosphine)iminium counterions, [N(C18H15P)(2)], prepared from the reaction of [Cu(C=Ph)(2)](-) and [{Ag(C=CPh)}(n)] in a 1:4 mole ratio, revealed a trigonal bipyramidal arrangement of Ag-5 with positional disorder, with copper substituting silver in some equatorial positions making the ratio of metal atoms 8.3Ag:1Cu. Each equatorial metal atom is a bonded to the alkynyl ligands in an almost linear fashion. Ag atoms in apical positions are asymmetrically pi bonded, with varying degrees of strength, to three alkyne ligands each.