catena-Poly[sodium [[tris(3-methyl­pyridine-2-carboxylato)europate(III)]-μ-3-methylpyridine-2-carboxylato] trihydrate]

In the title structure, {Na[Eu(C(7)H(6)NO(2))(4)]·3H(2)O}(n), the Eu(III) atom is nine-coordin­ated within a slightly distorted tricapped trigonal-prismatic coordination geometry defined by five carboxyl­ate-O atoms and four pyridine-N atoms. One of the carboxyl­ate ligands bridges the Eu cations, forming a one-dimensional coordination polymer along the b axis. The Eu—O bond distances lie within the range 2.362 (4)–2.461 (4) Å. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds link the polymers into a three-dimensional network.