catena-Poly[[tetra-aqua-(μ-4,4'-bipyridine-κN:N')zinc(II)] fumarate tetra-hydrate].

In the title compound, {Zn(C(10)H(8)N(2))(H(2)O)(4)·4H(2)O}(n), the Zn(II) atom is coordinated by two N atoms from two μ-4,4'-bipyridine ligands and four water mol-ecules in a distorted octa-hedral geometry. The coordination unit is extended through the Zn-N bond, leading to a one-dimensional cationic chain. A twofold rotation axis passes through the Zn atom and along the axis of the 4,4'-bipyridine ligand. Each uncoordinated water mol-ecule acts as both hydrogen-bond donor and acceptor. A three-dimensional network is constructed through hydrogen bonds involving water mol-ecules and fumarate dianions.