Synthesis, structure and fluorescence of two novel manganese(II) and zinc(II)-1,3,5-benzene tricarboxylate coordination polymers: Extended 3D supramolecular architectures stabilised by hydrogen bonding

Two new coordination polymers {[Mn(H2btc)(phen)(H2O)2]H2btc · H2O}n (1) [H3btc = 1,3,5-benzene tricarboxylic acid, phen = phenanthroline] and {[Zn3(btc)2(H2O)8](H2O)4}n (2) have been synthesised and structurally characterised. Both the complexes crystallise as 1D chain, which further propagates through ligand-based hydrogen bonding interactions into a 3D supramolecular architecture. Supramolecular framework of 1 is constructed by [Mn(H2btc)(phen)(H2O)2]+ as well as the constituent materials–uncoordinated H2btc− and water molecules. Complex 2 exists as a corrugated chain with both the bridging and terminal Zn2+ ions and each zinc centre is coordinated to four water molecules. Both 1 and 2 are stacked by mutual π-stacking of the ligands and exhibit strong fluorescence emission band at 414 and 400 nm, respectively.

Two new one-dimensional coordination polymers {[Mn(H2btc)(phen) (H2O)2]H2btc · H2O}n (1) {[Zn3(btc)2(H2O)8] (H2O)4}n (2) have been synthesised at ambient temperature without applying hydrothermal procedure. Binding mode of 1,3,5-benzene tricarboxylic acid with the Mn(II) and Zn(II) ions is different. Both the structures exhibit 3D supramolecular frameworks by the numerous hydrogen bonding interactions involving the constituent materials.Figure optionsDownload as PowerPoint slide