Catena-Poly[[[pentaaquathulium(III)]-μ-5-sulfonatobenzene-1,3-dicarboxylato] 4,4′-bipyridyl 1.5-solvate hemihydrate

Abstract

The crystal structure of the title compound, {[Tm(C(8)H(3)O(7)S)(H(2)O)(5)] x 1.5C(10)H(8)N(2) x 0.5H(2)O}(n), is built up from two [Tm(SIP)(H(2)O)(5)] molecules (SIP(3-) is 5-sulfonatobenzene-1,3-dicarboxylate), three 4,4'-bipyridyl (bpy) molecules and one solvent water molecule. One of the bpy molecules and the solvent water molecule are located on an inversion centre and a twofold rotation axis, respectively. The Tm(III) ion coordination is composed of four carboxylate O atoms from two trianionic SIP(3-) ligands and five coordinated water molecules. The Tm(3+) ions are linked by the SIP(3-) ligands to form a one-dimensional zigzag chain propagating along the c axis. The chains are linked by interchain O-H...O hydrogen bonds to generate a two-dimensional layered structure. The bpy molecules are not involved in coordination but are linked by O-H...N hydrogen bonds to form two-dimensional layers. The two-dimensional layers are further bridged by the bpy molecules as pillars and the solvent water molecules through hydrogen bonds, giving a three-dimensional supramolecular structure. pi-pi stacking interactions between the parallel aromatic rings, arranged in an offset fashion with a face-to-face distance of 3.566 (1) Angstrom, are observed in the crystal packing.