Crystal structure of (mu-1,4-dicarboxybutane-1,4-dicarboxylato) bis[bis(triphenylphosphane) silver(I)] dichloromethane trisolvate

The molecular structure of the tetrakis(triphenylphosphanyl) disilver salt of butane-1,1,4,4-tetracarboxylic acid, [Ag-2(C8H8O8)(C18H15P)(4)] center dot 3CH(2)Cl(2), crystallizes with one and a half molecules of dichloromethane in the asymmetric unit. The coordination complex exhibits an inversion centre through the central CH2-CH2 bond. The Ag I atom has a distorted trigonal-planar P2O coordination environment. The packing is characterized by intermolecular Tshaped pi-pi interactions between the phenyl rings of the PPh3 substituents in neighbouring molecules, forming a ladder-type superstructure parallel to [010]. These ladders are arranged in layers parallel to (101). Intramolecular hydrogen bonds between the OH group and one O atom of the Ag-bonded carboxylate group results in an asymmetric bidendate coordination of the carboxylate moiety to the Ag-I ion.