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

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—O_carboxyl 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.

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