In the present study, the proton affinity (PA) and the gas phase basicity have been calculated for a series of azine heterocycles bearing phosphazene motif by using the B3LYP/6-31 + G(d,p) method. The results indicate that the designed compounds meet remarkable superbasicity. The calculated PAs are in the range of 931-1117 kJ mol À 1 . The studied molecules have flexible structure and can be used as anion receptors through strong hydrogen bonding. The interaction of superbases 7-9 with F À , Cl À and NO 3 À anions has been also investigated using the Density Functional Theory. The anion receptors show a high affinity toward F À anion, therefore, they may be considered as selective F À receptors.

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