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Abstract
In order to complex cations and neutral molecules, hosts including the phosphoramide group have been designed and studied by nmr and X-ray crystallography. Macrocyclic derivatives containing the phosphoryl group can be easily synthesized from a diamine and an appropriate diaminophosphane. The complexation of alkaline and ammonium cations has been studied. The stability of the complexes is strongly related to the preorganized character of the phosphorus ligands. The formation of bis-macrocyclic compounds, bearing an asymmetric phosphorus atom is also reported.