The one-dimensional, polymeric compound (C15H11N3)Eu(H2O)2(NO3)(Pt(CN)4).CH3CN (1) has been shown to display an efficient donor-acceptor intramolecular energy-transfer (IET) process where ligand donors transfer energy to the Eu (III) acceptor. Single-crystal X-ray diffraction has been used to investigate the structural features of this compound in order to help understand the observed IET process. Crystallographic data: 1, monoclinic, space group P2(1)/c, a = 12.835(1) A, b = 15.239(1) A, c = 13.751(2) A, beta = 105.594(9) degrees , V = 2590.8(5) A(3), and Z = 4 (T = 290 K).

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Key indicators: single-crystal X-ray study; T = 290 K; mean (N-C) = 0.006 Å; R factor = 0.019; wR factor = 0.047; data-to-parameter ratio = 10.8.The title compound, [Ag 3 Tb(CN) 6 (H 2 O) 3 ] n , consists of hydrated Tb 3+ cations that are linked with dicyanoargentate anions into a three-dimensional network. The resultant TbN 6 O 3 coordination polyhedra have a tricapped trigonal prismatic geometry. Six N atoms from the dicyanoargentate groups form the corners of the trigonal prisms, while the O atoms of three water molecules reside in the capping positions to complete the coordination environment around terbium. Argentophilic interactions 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 (62m), Ag (2/m), C (m), N (m), O (m2m) and H (m). inorganic compounds i162 # 2007 International Union of Crystallography