C 18 H 22 Mo 8 N 3 NaO 34 ,monoclinic, P12 1 /c1(no. 14), a =15.329(3) Å, b =13.598(2) Å, c =21.674(4) Å, b =109.345(1)°, V =4262.8 Å 3 , Z =4,R gt (F) =0.038, wR ref (F 2 ) =0.095, T =293 K. Source of materialAmixture of MoO 3 (0.144 g, 1mmol), isonicotinic acid (0.13 g, 1mmol),Na 2 CO 3 (0.04 g, 0.5mmol) and water (15 mL) in amolar ratio of 2:2:1:1666 was in an autoclave inside aprogrammable electric furnace at 160°C for three days. After cooling to room temperature, block-shaped crystals of the title compound were obtained. + and polyoxoanion chains within the hybrids are linked together via multiple N-H×××Oand O-H×××Ohydrogen bonds leading to athree-dimensional supramolecular framework. Experimental details

In the title compound, [Cd(C8H4O5)(C12H12N2)], the CdII cation is coordinated by three 5-hy­droxy­isophthalate anions and one 5,5′-bimethyl-2,2′-bipyridine ligand in a distorted CdO4N2 octa­hedral geometry. The 5-hy­droxy­isophthalate anions bridge the Cd cations, forming a two-dimensional polymeric complex parallel to (100). In the complex, the hy­droxy group is linked to the uncoordinated carb­oxy-O atom via an O—H⋯O hydrogen bond. Weak C—H⋯O hydrogen bonds are also present in the crystal structure. One of the methyl groups is disordered over two positions in a 0.536 (11):0.464 (11) ratio.