Bifunctional metallodendrimers based on AB5 derivatives of cyclotriphosphazene as core and P,N ligands as terminal functions

•Synthesis of new phosphine imine (P,N) ligands.•Grafting of P,N ligands as terminal groups of dendrimers.•Palladium complexes of P,N dendrimeric ligands.•Bifunctional dendrimers with specific ratio of two functions.•31P NMR to account for subtle differences in the environment of phosphorus atoms.

The specific functionalization of hexachlorocyclotriphosphazene with one function different from the five others was used for the synthesis of bifunctional dendrimers having one protected amine linked to the core and either 5 phosphines or 10 phosphine imines (P,N ligands) as terminal groups. In the latter case, reaction with PdCl2(COD) affords the corresponding complexes of the P,N ligands. All compounds were characterized by multinuclear NMR, and particularly by 31P NMR, which proved to be a very precious tool for the characterization of sophisticated structures such as dendrimers.

Graphical abstractThe specific functionalization of hexachlorocyclotriphosphazene with one function different from the five others was used for the synthesis of bifunctional dendrimers having one protected amine linked to the core and either 5 phosphines or 10 phosphine imines (P,N ligands) as terminal groups, which were then used for the complexation of PdCl2.Figure optionsDownload full-size imageDownload as PowerPoint slide