518344-69-9Relevant academic research and scientific papers
Palladium and platinum complexes containing the linear tetraphosphine bis[((diphenylphosphino)ethyl)phenylphosphino]methane
Nair, Padma,Anderson, Gordon K.,Rath, Nigam P.
, p. 1494 - 1502 (2008/10/08)
The linear tetraphosphine bis [((diphenylphosphino)ethyl)phenylphosphino] methane (DPPEPM) has been prepared and separated into its meso and racemic forms. Each has been reacted with elemental sulfur, and the structure of the meso compound DPPEPM-S4 has been determined crystallographically. The meso or racemic form of DPPEPM reacts with 2 equiv of [MCl2(cod)] (M = Pd, Pt) or [PtR2(cod)] (R = Me, Ph, CH2Ph, C6H4Me-4) to give complexes of the form [M2X4(μ-DPPEPM)], in which DPPEPM acts as both a chelating and a bridging ligand. Complexes containing additional chloride bridges, [M2R2(μ-Cl)(μDPPEPM)]PF6, have been prepared from DPPEPM and [PtClR(cod)] (R = Me, Ph, CH2Ph), [PdClR(cod)] (R = Me, CH2Ph), or [Pd2R2(μ-Cl)2(AsPh3)2] (R = Ph, COMe), followed by TlPF6. Chloride-bridged compounds could also be prepared by treatment of [M2Cl4(μ-DPPEPM)] with 1 equiv of TlPF6. Addition of Bu4NI to [M2Me2(μ-Cl)(μ-DPPEPM)]PF6 resulted in bridge opening, and further treatment with TlPF6 gave the corresponding iodide-bridged species. The compounds have been characterized by NMR spectroscopy and by elemental analysis or high-resolution mass spectrometry. The solid-state structures of [Pd2Cl4(μ-DPPEPM)] and [Pt2Ph4(μ-DPPEPM)] are also reported.
