The interplay between conformation and hydrogen bond pattern was studied in 211 (C(O)NH)(N)2 P(O)-based phosphoric triamides retrieved from the Cambridge Structural Database (CSD) and one new molecular structure, (CHCl2C(O)NH)(CH3CH2CH2NH)2P(O). The O═C–N–P and C–N–P═O torsion angles were extracted for the conformational study of the C(O)NP(O) segment, and the conformations of ±sp±ap, ±sp±sc and ±ap±sp were found (sp = synperiplanar, ap = antiperi- planar, sc = synclinal). The conformations of hydrogen bond donor group(s) with respect to the acceptor group(s) were also considered. The investigated structures belong to three classes of (RC(O)NH)(R1R2N)2P(O) (R1 and R2 ≠ H), (RC(O)NH)(R1NH)2P(O) (R1 ≠ H) and heterocyclic (RC(O)NH)P(O)[NR1]2R2 phosphoric triamides (R1 = H or ≠ H, R2 = a hydrocarbon fragment), and the hydrogen bond patterns include dimer, tetramer, chain, tape, ladder, two-dimensional assembly and three-dimensional architecture. In the new structure, the conformation of the C(O)NP(O) fragment is –sp+ap, and molecules are assembled in a tape arrangement (parallel to the [110] axis) through NCP–H···O═P and NP–H···O═C hydrogen bonds (NCP is the nitrogen atom of the C(O)NHP(O) fragment and NP is the other N atom bonded to phosphorus).

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