Bis(μ-3-hydroxybenzoato)-κ ³ O ¹,O ^1′:O ¹;κ ³ O ¹:O ¹,O ^1′-bis-[(3-hydroxybenzoato-κ ² O,O′)(iso-nicotinamide-κN ¹)cadmium] tetra-hydrate

In the title centrosymmetric binuclear Cd ^II compound, [Cd ₂(C ₇H ₅O ₃) ₄(C ₆H ₆N ₂O) ₂]·4H ₂O, 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 carboxylate groups. In the crystal, O - H⋯O, N - H⋯O and C - H⋯O hydrogen bonds link the molecules 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.