Silver Acetate–Triphenylphosphine Complexes. Acetatobis(triphenylphosphine)silver(I) and its Sesquihydrate, and Bis[acetato(triphenylphosphine)silver(I)] Hydrate and its Hemihydrate

Abstract

The Ag atom in both independent molecules of acetatobis(triphenylphosphine)silver(I), [Ag(C2H3O2)(C18H15P)2], is bonded to the triphenylphospine and chelating acetato ligands in a distorted tetrahedral environment. Acetatobis(triphenylphosphine)silver(I) sesquihydrate, [Ag(C2H3O2)(C18H15P)2].1.5H2O, also crystallizes as two independent molecules whose Ag atoms adopt a similar geometry. One [Ag(C2H3O2)(C18H15P)2] molecule is linked through a water molecule to another complex molecule, which in turn is linked to the symmetry-related first molecule through the other two water molecules, one of which is disordered affording a chain structure parallel to the b axis. Bis(μ-acetato)-O,O':O;O:O-bis[(triphenylphosphine)silver(I)] hydrate, [Ag2(C2H3O2)2(C18H15P)2].H2O comprises two [Ag(C2H3O2)(C18H15P)] moieties; the acetato ligand behaves as a bidentate chelating anion in one complex moiety but as a monodentate anion in the other. The two moieties link through the singly bonded ester O atom into a dinuclear entity. Neighboring dinuclear entities are linked by hydrogen bonds involving their doubly bonded carboxyl ends with the disordered water molecule into a zigzag chain along the c axis. In bis(μ-acetato-O:O)bis[(triphenylphosphine)silver(I)] hemihydrate, [Ag2(C2H3O2)2(C18H15P)2].0.5H2O, the two Ag—Ocarboxyl distances are long enough for the geometry of the Ag atoms to be regarded as being essentially trigonal planar in the two complex units. The dinuclear molecule uses its doubly bonded O atoms to link with the disordered water molecule to afford a hydrogen-bonded tetranuclear entity.