The folded, tetrameric phosph(III)azane macrocycle [{P(μ-NtBu)}2{1,4-(NH)2C6H4}]4

The tetrameric macrocycle [{P(μ-NtBu)}2{1,4-(NH)2C6H4}]4, obtained from the reaction of the phosphazane dimer [ClP(μ-NtBu)]2 with p-phenylenediamine, has an unusual folded conformation in the solid state and contains a roughly tetrahedral arrangement of endo N–H groups for the potential coordination of anions.