The crystal structure of a new diazaphosphorinane-holding amidophosphoester, (C6H5O)[C10H6](NH)2P(O), is studied. The asymmetric unit is composed of three symmetry- independent molecules, which are similar in the viewpoint of bond lengths/angles. The main differences of these molecules are related to some torsion angles, especially the ones defining the orientation of C6H5O moiety with regard to the P═O group. Typically, the C—O—P═O torsion angles show the +ap, –sc and –sc conformations (ap = antiperiplanar and sc = synclinal). Thus, the distances of phenyl groups (of C6H5O segments) from the naphthalene rings are different in three molecules. In the crystal structure, the molecules are aggregated through N—H…O═P hydrogen bonds in a tape arrangement. This assembly includes eight-membered ring hydrogen bond motifs, and the P═O groups take part as a double-hydrogen bond acceptor.

Keywords