Crystal structure of cyclo-bis(μ4-2,2-diallylmalonato-κ6 O1,O3:O3:O1',O3':O1')tetrakis(triphenylphosphane-κP)tetrasilver(I)

Abstract

In the tetranuclear molecule of the title compound, [Ag4(C9H10O4)2(C18H15P)4], the AgI ion is coordinated by one P and three O atoms in a considerably distorted tetrahedral environment. The two 2,2-diallylmalonate anions bridge four AgI ions in a μ4-(κ6 O1,O3:O3:O1',O3':O1') mode, setting up an Ag4O8P4 core (point group symmetry -4..) of corner-sharing tetrahedra. The shortest intramolecular Ag⋯Ag distance of 3.9510(3)Å reveals that no direct d10⋯d10 interactions are present. Four weak intramolecular C-H⋯O hydrogen bonds are observed in the crystal structure of the title compound, which most likely stabilize the tetranuclear silver core.