page_title: 1,5-Diaza-3,7-diphosphacyclooctanes
section_title: Synthesis and reactions
hierarchical_section_title: 1,5-Diaza-3,7-diphosphacyclooctanes / Synthesis and reactions
caption_attribution_description: English: conformation of P2N2-M and P2N-M complexes
context_page_description: 1,5-Diaza-3,7-diphosphacyclooctanes are organophosphorus compounds with the formula [R'NCH₂PCH₂]₂, often abbreviated Pᴿ₂NR'₂. They are air-sensitive, white solids that are soluble in organic solvents. The ligands exist as meso and d, l-diastereomers, but only the meso forms function as bidentate ligands.
  Some metal-Pᴿ₂NR'₂ complexes catalyze the production and oxidation of hydrogen. The catalytic mechanism involves the interaction of substrate with the amines in the second coordination sphere.
context_section_description: The ligands are prepared by the condensation of a primary phosphine, formaldehyde, and a primary amine:
  2 RPH₂  +  4 CH₂O  +  2 RNH₂  →   [RNCH₂P(R')CH₂]₂  +  4 H₂O
  Diazadiphosphacyclooctanes function as chelating diphosphine ligands.  Typical nickel complexes contain two such ligands are give the formula [Ni(Pᴿ₂NR'₂)₂]²⁺.
  Cationic complexes of these P₂N₂ and related ligands often exhibit enhanced reactivity toward H₂.  These complexes serve as electrocatalysts for H₂ production.
caption: Conformation of chelate rings in P2N2-M and P2N-M complexes.
exif: {}