Bis(2-pyridylimino)isoindole (BPI) Ligands with Novel Linker Units: Synthesis and Characterization of Their Palladium and Platinum Complexes

Summary. With the aim of immobilizing bis(2-pyridylimino)isoindolate (BPI) ligands their backbone structure has been functionalized with several linker units. Their fixation was carried out at the stage of the phthalodinitrile precursor by nucleophilic ipso-substitution of 4-nitrophthalodinitrile. Subsequent synthesis of the functionalized phthalodinitriles with two molar equivalents of the 2-aminopyridine derivatives gave the corresponding BPI ligands. Reaction of the ethyleneglycol functionalized BPI derivative with the zeroth generation carbosilane dendrimer G-0]_4-exo-Cl yielded the functionalized dendrimer G-0]_4-exo-O(CH₂)₂O]-10-MeBPI (7). The synthesis of the palladium complexes was carried out by reaction of the protioligands with (PhCN)₂PdCl₂] in benzene using triethylamine as auxiliary base whereas the first examples of BPI-platinum complexes were prepared using (COD)PtCl₂] as starting material.