Homo- and heteroleptic group 4 2-(diphenylphosphino)pyrrolide complexes: Synthesis, coordination chemistry and solution state dynamics

摘要

The synthesis and solid state structures of homo- and heteroleptic Zr and Ti complexes of 2-(diphenylphosphino)pyrrolide (NP) are reported. The homoleptic Zr(NP)(4) (1) and Ti(NP)(4) (2) are 8-coordinate in the solid state, and both show extremely long M-P bonds of approximately 2.9 angstrom. In solution, the phosphine ligands in all complexes are labile: in the titanium complexes phosphine dissociation is rapid at room temperature and equilibrates all phosphines into a single P-31 resonance, whereas in the Zr complex 1 dissociation is slower and full equilibration does not occur until 90 degrees C. The potential to utilize these novel complexes as metalloligands toward other transition metals is discussed. (C) 2014 Elsevier Ltd. All rights reserved.