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The title complex, [Zn(C 10 H 8 N 2 ) 2 (H 2 O) 4 ](C 9 H 7 O 3 ) 2 , was obtained by the hydro­thermal reaction of zinc sulfate with mixed 4-hydroxy­lcinnamic acid (H 2L ) and 4,4′-bipyridine (4,4′-bipy) ligands. The complex consists of a centrosymmetric [Zn(4,4′-bipy) 2 (H 2 O) 4 ] 2+  cation with the metal centre in a distorted ZnN 2 O 4  coordination, and of two H L−  anions. Extensive O—H⋯O and O—H⋯N hydrogen-bonding inter­actions between the constituents lead to the formation of a three-dimensional network.

Tetraaquabis(4,4′-bipyridine)zinc(II) bis(trans-4-hydroxycinnamate)