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

Abstract

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.