Metal(II) coordination polymers based on a flexible N,N′,N″-tris(3-pyridyl)-1,3,5-benzenetricarboxamide ligand and organic polycarboxylate ligands: Syntheses, structures, and luminescence

Four metal(II) coordination polymers based on a flexible ligand N , N ′, N ″-tris(3-pyridyl)-1,3,5-benzenetricarboxamide (L), namely, [Co(L 1 )(L)] n ( 1 ), {[Cd(L 1 )(L)]·0.5H 2 O} n ( 2 ), {[Zn 1.5 (L 2 )(L)(H 2 O) 2 ]·1.5H 2 O} n ( 3 ) and {[Co 1.5 (L 2 )(L)(H 2 O) 2 ]·1.5H 2 O} n ( 4 ), where H 2 L 1 = 1,4-benzenedicarboxylic acid and H 3 L 2 = 1,3,5-benzenetricarboxylic acid, have been synthesized under hydrothermal conditions. The structure analyses reveal that compounds 1 and 2 are isomorphic three-dimensional networks and posses (3,5)-connected nets with (4 2 ·6) 2 (4 2 ·6 4 ·8 10 ·10) topology. Both 3 and 4 are isomorphic layered structures, which can be simplified as 2D → 2D interpenetrating undulated 6 3 - hcb nets. The structural differences indicate that the effect of polycarboxylate ligands play an important role in the resulting structures of these networks. Moreover, thermal properties and luminescent properties were also investigated for the compounds.