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The asymmetric unit of the title compound, {[Zn(C 7 H 7 O 2 ) 2 (C 10 H 8 N 2 )]·4H 2 O}  n  , contains a highly distorted octa­hedral Zn II  metal center strongly coordinated by two N atoms of two 4,4′-bipyridine (4,4′-bipy) ligands and chelated by two 4-methyl­benzoate anions. The crystallographic inversion center and glide plane present at the center of the C—C single bond of 4,4′-bipy, along with the  cis  coordination motif of the 4,4′-bipy, lead to one-dimensional zigzag chains. There are a large number of water mol­ecules in the crystal structure, which also form one-dimensional chains through O—H⋯O hydrogen bonds.

catena-Poly[[[bis(4-methylbenzoato-κ2O,O′)zinc(II)]-μ-4,4′-bipyridine-κ2N:N′] tetrahydrate]

catena-Poly[[[bis(4-methylbenzoato-κ²O,O′)zinc(II)]-μ-4,4′-bipyridine-κ²N:N′] tetrahydrate]