Silver(I) Phenoxyalkanoates: The Crystal and Molecular-Structures of catena-[Bis-μ-(phenoxyacetato-O,O')-disilver(I)] and Bis[bis-μ-(4-fluoro-phenoxyacetato-O,O')-bis{aquasilver(I)}]

Abstract

The crystal structures of the silver(I) complexes with phenoxyacetic acid and 4-fluorophenoxyacetic acid, catena-[ bis-μ-(phenoxyacetato-O,O′)- disiver (I)] (1) and bis [ bis-μ(4-fluorophenoxyacetato-O,O′)-{ aquasilver (I)}] (2) have been determined and refined to residuals R 0.068 and 0.036 respectively for 1783 and 2549 observed reflections. Both structures are based on similar bis ( carboxylato -O,O′) bridged dimers with Ag-Ag 2.866(2)Ǻ (1) and 2.836(2)Ǻ (2). However, (1) forms a step polymer through terminal oxygens [Ag-O 2.417, 2.443(9)Ǻ], while (2) is a discrete centrosymmetric tetramer with a water molecule on each of the four silver atoms [Ag- Ow 2.499(4)Ǻ], and an Ag-O bridge distance of 2.498(4)Ǻ. This results in triangular coordination about one silver and tetrahedral about the second. Experimental data indicate that anhydrous silver(I) 4-chlorophenoxyacetate (3) is similar to complex (1).