Palladium complexes of sterically hindered meridonal tridentate NNN ligands

Acetatopalladium(II) complexes of two new 1,3-bis(arylimino)isoindoline ligands H(bai), 1,3-bis(3,6-dimethylpyridylimino)-α,α′-dimethoxyisoindoline H(3,6-MepMeOi) (5) and 1,3-bis(4-methyl-5-isopropylthiazolylimino)isoindoline H(iPrbti) (6) have been prepared from commercial precursors and palladium(II)acetate in 4 and 3 steps, respectively. The new complexes 7 and 8 were characterized by 1H and 13C NMR spectroscopy and mass spectrometry and could be further investigated by single crystal X-ray diffraction studies. The molecular structures of 7 × 2 CHCl3 and of 8 show differences in the conformational fine-tuning and unravel a higher degree of similarity with related tripyrrinates for the bti derivative 8 than for the bpi species 7.

Graphical abstractAcetatopalladium(II) complexes of two new 1,3-bis(arylimino)isoindoline ligands H(bai) have been prepared from commercial precursors and palladium(II)acetate in 4 and 3 steps, respectively, and their molecular structures were determined by single crystal structure analyses. Intramolecular strain and molecular distortion obviously depend mainly on the size of the terminal heterocyclic ring, which changes upon going from a bpi to a bti derivative.Figure optionsDownload full-size imageDownload as PowerPoint slide