Exploring different coordination modes of the first tetradentate NHC/1, 2, 3-triazole hybrid ligand for group 10 complexes. Issue 39 (25th September 2019) - Schlagintweit, Jonas F.
Abstract : Synthesis and characterisation of the first tetradentate N-heterocyclic carbene (NHC)/1, 2, 3-triazole hybrid ligand obtained by means of copper(i ) catalyzed "click" chemistry and its application for the synthesis of group 10 complexes is reported. Abstract : Synthesis and characterisation of the first tetradentate N-heterocyclic carbene (NHC)/1, 2, 3-triazole hybrid ligand obtained by means of copper(i ) catalyzed "click" chemistry and its application for the synthesis of group 10 complexes is reported. For palladium(ii ), two complexes with different ligand coordination modes were obtained. One compound depicts a NCCN coordination sphere with all 1, 2, 3-triazole and NHC moieties coordinating to the metal, whereas the other one depicts a CCCC coordination sphere resulting from NHC coordination of two ligands. The non-coordinating 1, 2, 3-triazoles form strong intramolecular hydrogen bonds as proven by SC-XRD. The resulting rigid conformation is retained in solution even at 70 °C as demonstrated by variable temperature NMR spectroscopy. In contrast to palladium(ii ), both nickel(ii ) and platinum(ii ) exclusively form complexes with a CCCC coordination sphere regardless of reaction conditions. Both compounds share characteristics with their palladium(ii ) counterpart, including strong intramolecular hydrogen bonds.