Single and double crown macrocyclic derivatives of cyclotriphosphazene as receptors of silver(I) ions

We report the preparation of new single and double PNP-lariat ether derivatives. L1 was synthesized from a MONO-ANSA precursor and L2 was synthesized from a BIS-ANSA precursor by subsequent substitution of the chlorine atoms. The reactive chlorine atoms were substituted by piperidinyl groups. Their structures were established by elemental analysis, MS, H-1 NMR, P-31 NMR and C-13 NMR spectroscopy. Furthermore, this work includes an investigation of the complexation of silver(I) ions by the two new ligands in methanol and acetonitrile solutions. H-1 NMR, P-31 NMR and C-13 NMR spectra were recorded to investigate how the complexation of silver(I) ions by the investigated macrocyclic ligands occurs.