Self-assembly of a Co(II) dimer through H-bonding of water molecules to a 3D open-framework structure

Reaction of pyridine-2,4,6-tricarboxylic acid (ptcH3) with Co(NO3)2.6H2O in presence of 4,4- bipyridine (4,4´-bpy) in water at room temperature results in the formation of {[Co2(ptcH)2(4,4´-bpy) (H2O)4].2H2O}, (1). The solid-state structure reveals that the compound is a dimeric Co(II) complex assembled to a 3D architecture via an intricate intra- and inter-molecular hydrogen-bonding interactions involving water molecules and carboxylate oxygens of the ligand ptcH2–. Crystal data: monoclinic, space groupP21/c,a =11,441(5) Å,b =20,212(2) Å,c = 7,020(5) Å,b =103,77(5)^0, V =1576,7(1)Å3, Z =2, R1 =0,0363, wR2 =0,0856, S =1,000.