Amine and ether bis-1,2,3-triazole ligands and their transition metal complexes

The stereochemistry of flexible tridentate ligands influences many important properties like stability and reactivity in a chemical or biological environment. Metal coordination with bis-1, 2, 3- triazole ligands is an unexplored area of research in comparison to the structurally related dipicolylamine derivatives. In this work, bis-1, 2, 3-triazole derivatives with unsubstituted N- and O-central donor atoms were prepared using click chemistry by the reaction of aromatic azides with dipropargylamine and dipropargyl ether, respectively. Coordination of transition metals was studied in solution by NMR and UV-Vis spectrometry, along with characterisation in solid-state by single- crystal X-ray crystallography. Our research has shown that these types of ligands prefer formation of ML2 metal complexes. Study of the stereochemical preferences is currently underway as these ligands are able to form cis-, trans-fac or mer-isomers.