Diaqua­Bis­(2-Hy­Droxy­Benzoato-Κo 1)Bis­(Nicotinamide-Κn 1)Cadmium–Diaqua­Bis­(2-Hy­Droxy­Benzoato-Κ2 O 1,O 1′)(Nico­Tin­Amide-Κn)Cadmium–Water (1/2/4)

Abstract

The crystal structure of the title compound, [Cd(C7H5O3)2(C6H6NO)2(H2O)2]·2[Cd(C7H5O3)2(C6H6NO)(H2O)2]·4H2O, consists of two kinds of CdII complexes (A and B) and lattice water mol­ecules. In complex A, [Cd(C7H5O3)2(C6H6NO)2(H2O)2], the CdII cation is located on an inversion center and is coordinated by two salicylate anions, two nicotinamide (NA) ligands and two water mol­ecules in a slightly distorted octa­hedral geometry. In complex B, [Cd(C7H5O3)2(C6H6NO)(H2O)2], the CdII cation is coordinated by two salicylate anions, one nicotinamide (NA) ligand and two water mol­ecules in an irregular seven-coordinate geometry. There are extensive intra­molecular O—H⋯O and weak C—H⋯O hydrogen bonds as well as extensive inter­molecular O—H⋯O and N—H⋯O hydrogen bonding in the crystal structure. π–π stacking between the pyridine and benzene rings, between the benzene rings, between the benzene and pyridine rings and between the pyridine rings [centroid–centroid distances = 3.5989 (10), 3.6005 (10), 3.5800 (9) and 3.5205 (10) Å, respectively] further stabilize the crystal structure. A weak N—H⋯π inter­action also occurs. One of the lattice water mol­ecules is disordered over two positions with an occupancy ratio of 0.70:0.30.