catena-Poly[[[diapua[trans-3-(4-pyridyl)acrylato]samarium(III)]-di-μ-trans-3-(4-pyridyl)acrylato] dihydrate]

In the title compound, {[Sm(4-pya)3(H2O) 2]̇2H2O}n [4-pya is trans-3-(4-pyridyl) acrylate, C8H6NO2], each SmIII atom is ten-coordinated and has a bicapped square-antiprismatic coordination geometry. There is a crystallographic center of symmetry at the mid-point of the Sm⋯Sm line within each [Sm(4-pya)3(H2O) 2]2 dimer. Each dimer is interconnected by two pairs of bridging 4-pya ligands to form a one-dimensional chain. Neighboring chains are connected via hydrogen bonds to form a three-dimensional network. © 2005 International Union of Crystallography.