33. DANIEL-BERNARD LEZNOFF
Information acquired: 2025
DANIEL-BERNARD LEZNOFF is an academic who published a paper in 1997 entitled Paramagnetic organometallic complexes of chromium, iron and cobalt. DANIEL-BERNARD LEZNOFF published this work as part of a team: Leznoff, Daniel Bernard. Here is a description of this work: The,,chemistry of the amidodiphosphine ligand â»N (SiMeâ‚‚CHâ‚‚PPhâ‚‚) â‚‚ with chromium, iron and cobalt metal centres in the 2 and 3 oxidation states is explored. Metal-chloride complexes MCl[N (SiMeâ‚‚CHâ‚‚PPhâ‚‚) â‚‚] are high-spin and tetrahedral for iron (II) and cobalt (II) and dinuclear with bridging chlorides for chromium (II). Alkylation reactions give high-spin, square-planar CrR[N (SiMeâ‚‚CHâ‚‚PPhâ‚‚) â‚‚] (R = Me, CHâ‚‚Ph, SiMesâ‚‚H) , the benzyl fragment in Cr (r] ²â» CHâ‚‚Ph) [N (SiMeâ‚‚CHâ‚‚PPhâ‚‚) â‚‚ ] is n²-bound. The analogous cobalt (II) alkyl complexes, CoR[N (SiMeâ‚‚CHâ‚‚PPhâ‚‚) â‚‚] (R = Me, CHâ‚‚Ph, CHâ‚‚SiMe₃), are square-planar and low-spin, the benzyl fragment is n²-bound. CrMe[N (SiMeâ‚‚CHâ‚‚PPhâ‚‚) â‚‚] reacts with Hâ‚‚ to give {[ (Phâ‚‚PCHâ‚‚SiMeâ‚‚) â‚‚N]Cr) â‚‚ (μ-H) â‚‚, which is isostructural with the bridgin.