N,N′,N′′,N′′′-Tetrakis(2-methylphenyl)­oxybis(phospho­nic diamide): a redetermination at 150 K with Mo Kα radiation

The structure of the title compound, C28H32N4O3P2, has been redetermined at 150 K, with much improved precision. The structure and mol­ecular packing of the title compound was previously determined using Cu Kα radiation, with an R value of 0.0933 [Cameron et al. (1978 ▶). Z. Naturforsch. Teil B, 33, 728–730]. The c-axis length in this structure [13.8401 (8) Å] is almost half that reported in the original study. In the title compound, two (C6H4(2-CH3)NH)2P(O) units are bridged via an O atom [P—O—P = 133.31 (11)°]. The P atoms adopt a slightly distorted tetra­hedral coordination geometry. In the crystal, mol­ecules are linked via N—H⋯OP hydrogen bonds into extended chains parallel to the c axis. An intra­molecular N—H⋯O=P hydrogen bond is also found in the mol­ecule

N-Benzoyl-N′,N′′-dicyclo­hexyl­phospho­ric triamide

In the title compound, C19H30N3O2P, the central P atom has a distorted tetra­hedral configuration. The N atoms in both cyclo­hexyl­amide moieties exhibit a slight deviation [0.32 (7) and 0.44 (6) Å] from planarity, while the benzoyl­amide N atom is planar [0.11 (3) Å]. In the crystal, mol­ecules are linked via N—H⋯O(P) and N—H⋯O(C) hydrogen bonds, forming R 2 2(10) rings within linear arrangements parallel to the b axis

N,N′-Dibenzyl-N,N′-dimethyl-N′′-(4-nitro­benzo­yl)phospho­ric triamide

The P atom in the title compound, C23H25N4O4P, is in a slightly distorted tetra­hedral coordination environment and the N atoms show sp 2 character. The phosphoryl group and the NH unit are syn with respect to each other. In the crystal, pairs of inter­molecular N—H⋯O(P) hydrogen bonds form centrosymmetric dimers

N,N′-Dicyclohexyl-N,N′-dimethyl-N′′-(4-nitrobenzoyl)phosphoric triamide

The P atom in the title compound, C21H33N4O4P, is in a slightly distorted tetrahedral coordination environment and the phosphoryl and carbonyl groups are anti to each other. The environment of each N atom is essentially planar (average angles of 119.9 and 118.4°). In the crystal structure, the H atom of the C(=O)NHP(=O) group is involved in an intermolecular –P=O...H–N– hydrogen bond, forming centrosymmetric dimers