Salt structures in a series of hexacoordinated phosphorus polycyclic derivatives

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Recently we synthesized polycyclic framework structures of new type formed via the nitrogen– phosphorus intramolecular coordination bonding [1]. The presence of a secondary amino group connected with the phosphorus atom through a carbon atom (aminoalkylphosphonate analog) determines a possibility to form a salt structure on this basis. Compounds Ia–Id were found to react with dibromoacetic and picric acids in a solvent at room temperature to afford the compounds of salt structure IIa–IId. The chemical shift of the phosphorus atom is observed in the range of –113 to –116 ppm, which is characteristic of the compounds of the hexacoordinated phosphorus atom. DOI: 10.1134/S1070363211020277