Design and synthesis of coordination networks containing amide,pyridine and carboxylate functionalities

The reactions of bis(pyridinecarboxamido)alkane with copper(II) in the presence of mono or dicarboxylic acids resulted in discrete species, one-dimensional and two-dimensional networks. The carboxylates considered for this study include m-nitrobenzoic acid, isophthalic acid and succinic acid. In the presence of m-nitrobenzoic acid the ligands with Cu(II) form 1D coordination networks which include m-nitrobenzoic acid and water molecules as guests. The use of isophthalic acid resulted in discrete species while the use of succinic acid resulted in a two-dimensional layer containing rectangular grids of dimension 9.7 × 16.5 Å². The 2D layers in this complex exhibit inclined 2-fold interpenetration. Further, all these coordination networks are assembled via hydrogen bonding interactions between the amides and water molecules. The Cu(II) centre exhibits a unique octahedral coordination geometry, for the complexes reported here, as it coordinates with two each of pyridine moieties, water molecules and carboxylates.