The folded, tetrameric phosph(III)azane macrocycle [{P(mu-(NBu)-Bu-t)}(2){1,4-(NH)(2)C6H4}](4)

The tetrameric macrocycle [{P(mu-(NBu)-Bu-t)}(2){1,4-(NH)(2)C6H4}](4), obtained from the reaction of the phosphazane dimer [CIP(mu-(NBu)-Bu-t)](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.