1,1-Bis(di­phenyl­phosphor­yl)hydrazine

The title compound, C24H22N2O2P2, contains a diphosphazane backbone, as well as a hydrazine entity. The P—N—P diphosphazane unit and the N-amine N atom are almost coplanar, and the O atoms of the Ph2P(O) units are oriented trans to each other with respect to the P⋯P axis. In the crystal, centrosymmetrically related mol­ecules are linked into dimers by pairs of N—H⋯O hydrogen bonds, forming rings of graph-set motif R22(10).