Palladium complexes bearing κ2-N,N and κ3-N,N,O pendant amine bis (phenolate) ligands

The synthesis and characterization of ten new palladium(II) amine bis(phenolate) complexes is reported. Solution and single-crystal X-ray diffraction studies reveal the presence of both kappa(2)-N,N and kappa(3) -N,N,O binding modes in these square planar complexes. For complexes with sterically less demanding phenolate donors, addition of external acidic or basic reagents allows for the selective masking of a coordination site at Pd. Complexes bearing bulky cumyl substituents on phenolate donors exhibited unusual 1 1-I NMR spectroscopic features that are consistent with an anagostic interaction with the palladium center. Computational analysis at the omega B97X-D/LAN2LDZ level of theory supported the assertion that such an anagostic interaction may play a role in stabilizing kappa(2) complexes bearing a cumyl-substituted amine bis(phenolate) ligand. X-ray crystallographic data for H(1)a-PdCl2, H(2)2a-PdCl2, H1b-PdCl, H2b-PdCl, H1d-PdCl, and H1e-PdCl are reported.