518344-53-1Relevant 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.
Approaches to bi- and trimetallic platinum and palladium complexes using the DPPEPM ligand
Nair, Padma,Anderson, Gordon K.,Rath, Nigam P.
, p. 1307 - 1310 (2008/10/08)
Bis{(diphenylphosphinoethyl)phenylphosphino}methane (DPPEPM) reacts with [PtR2(cod)] in 1:1 ratio to give [PtR2 (DPPEPM-PP)] (2a, R = Me; 2b, R = Ph), whereas with [PtCl2(cod)] or [PdCl 2(cod)] it yields the ionic species [M(DPPEPM-PP)2] 2+ (3 and 4). With [MClMe(cod)], the product is [MMe(DPPEPM-PPP)]+ (5, M = Pt; 6, M = Pd), in which one of the internal P atoms of the ligand is uncoordinated. These complexes undergo oxidation of the free P atom to give 7 and 8 on standing in solution. Complexes 2-4 may be used to construct bimetallic and trimetallic mixed metal complexes. The molecular structures of 7 and [PtMe2(μ-DPPEPM)PdCl 2] (11) are reported.
