catena-Poly[[[pentaaquaeuropium(III)]-μ-5-sulfonatoisophthalato-κ(4) O (1),O (1′):O (3),O (3′)] 4,4’-bipyridine N,N′-dioxide hemisolvate trihydrate]

In the crystal structure of the title compound, {[Eu(C(8)H(3)O(7)S)(H(2)O)(5)]·0.5C(10)H(8)N(2)O(2)·3H(2)O}(n), the Eu(III) coordination polymer displays a ribbon motif as the 5-sulfoisopthalate anion uses one of carboxyl –CO(2) units to chelate to a Eu atom and the other to bind to other two Eu atoms; the sulfonyl –SO(3) unit is not involved in coordination. Adjacent ribbons are linked by O—H⋯O hydrogen bonds, generating a three-dimensional network. The 4,4′-bipyridine-N,N′-dioxide mol­ecule lies on an inversion centre and is hydrogen-bonded to the complex network. The coordination geometry of the Eu atom is a monocapped square anti­prism.