Phosphine-Based Hybrid Ligands and Their Coordination Chemsitry
The development of new phosphine-based hybrid ligands and the synthesis of novel complexes incorporating these ligands lies at the very heart of our research. Along these lines, we have designed a number of significantly new hybrid ligands with different charges and unprecedented topologies. In addition to trianionic tripods, we also prepared dianionic molecular claws and meridionally coordinating pincer ligands in our laboratory already. Over the past years, we mainly focused on amidophosphines (N,P-hybrid ligands) and their coordination chemistry with early transition metals (see illustration shown below). Structurally related C,P- and O,P-hybrid ligands and their complexes are presently under investigation.
Cyclometallation, C−H-Activation and Homogeneous Catalysis
As a result of their design, some of our complexes are prone to cyclometallation. As intended, this feature often allows for the isolation of C−H-activated complexes, which tend to react with gaseous dihydrogen. Productive hydrogenations of this type usually lead to the formation of reactive hydrido complexes or to the formation of species that originate from transient hydrides (c.f. [PNP]-coordinated zircona-norbornadienes). In our laboratory, we employ such complexes to accomplish intriguing stoichiometric and catalytic reactions (see illustration shown below).