Poly[triaquahexa-μ-cyanido-terbium(III)-trisilver(I)]: A 4f-4d bimetallic coordination polymer

The title compound, [Ag3Tb(CN)6(H2O)3] n , consists of hydrated Tb 3+ cations that are linked with dicyano-argentate anions into a three-dimensional network. The resultant TbN6O3 coordination polyhedra have a tricapped trigonal prismatic geometry. Six N atoms from the dicyano-argentate groups form the corners of the trigonal prisms, while the O atoms of three water mol-ecules reside in the capping positions to complete the coordination environment around terbium. Argentophilic inter-actions give rise to a two-dimensional network of Ag atoms. All of the atoms in the structure are located on special crystallographic positions. Only one unique atom of each type is found in the structure. The site symmetry of each is: Tb ( 2m), Ag (2/m), C (m), N (m), O (m2m) and H (m). © International Union of Crystallography 2007.