Received 13 July 2011
The P atom in the title molecule, C19H31N2O2P, is in a distorted tetrahedral configuration with the bond angles in the range 101.48 (10)-118.58 (9)°. The N-H units have a syn orientation with respect to one another. In the crystal, molecules are connected via two different intermolecular N-HO(P) hydrogen bonds into chains along the a axis in which the O atom of the P=O group acts as a double acceptor.
For background to phosphoramidate compounds, see: Pourayoubi et al. (2011). For bond lengths in related structures, see: Sabbaghi et al. (2011); Rudd et al. (1996). For double hydrogen-bond acceptors, see: Steiner (2002).
Data collection: X-AREA (Stoe & Cie, 2005); cell refinement: X-AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL, PLATON (Spek, 2009) and enCIFer (Allen et al., 2004).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH5287 ).
Support of this investigation by North Tehran Branch, Islamic Azad University, is gratefully acknowledged.
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