Bis(μ-3-hy-droxy-benzoato)-κO,O:O;κO:O,O-bis-[(3-hy-droxy-benzoato-κO,O')(iso-nicotinamide-κN)cadmium] tetra-hydrate.

In the title centrosymmetric binuclear Cd(II) compound, [Cd(2)(C(7)H(5)O(3))(4)(C(6)H(6)N(2)O)(2)]·4H(2)O, the six-coordinated Cd(II) atom is chelated by the carboxyl-ate groups of the two 3-hy-droxy-benzoate (HB) anions; the two monomeric units are bridged through the two O atoms of the two carboxyl-ate groups. In the crystal, O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional network. π-π Contacts between the pyridine rings and between the benzene rings [centroid-centroid distances = 3.770 (1), 3.769 (1) and 3.632 (1) Å] may further stabilize the structure.