132512-45-9Relevant academic research and scientific papers
Bis(diphenylphosphino)methane-assisted Synthesis of Iron-platinum and -palladium Clusters. Crystal Structures of and (dppm=Ph2PCH2PPH2)
Braunstein, Pierre,Richert, Jean-Luc,Dusausoy, Yves
, p. 3801 - 3814 (1990)
Reactions of (dppm=Ph2PCH2PPh2) complexes with carbonyl reagents afforded dppm-bridged Fe-M mixed-metal complexes: (1) was best obtained using , (2) by the reaction K, (4) by the reaction with Na2, and (5) by the reaction with Na2.Reactions of Pd with Na2 afforded (6; M=Pd) and (7; M=Pt) in high yields.Cluster (7) was shown to exist in two isomeric forms.The kinetic isomer, isolated pure at -20 deg C, contains a terminal Pd-bound carbonyl whereas the thermodynamic isomer has a terminal Pt-bound carbonyl ligand.A 1:1 ratio is observed at equilibrium.The cluster (3) was obtained quantitatively by reaction of (1) or with 1 or 2 equivalents of dppm.These reactions were shown to occur first by substitution of the Pt-bound carbonyl ligand.Low-yield interconversion of (1) and (2) was observed as a result of metal-exchange reactions.The structures of clusters (1) and (2) have been established by single-crystal X-ray diffraction studies.In (1) a Fe-Pt bond is bridged by the dppm ligand and Fe(1)-Fe(2) 2.740(2), Pt-Fe(1) 2.542(1), and Pt-Fe(2) 2.557(1) Angstroem.In (2) the Pt-Pt bond is bridged by the dppm ligand and Fe-Pt(1) 2.541(3), Fe-Pt(2) 2.541(4), and Pt(1)-Pt(2) 2.581(1) Angstroem.The i.r. and n.m.r. spectra (1H, 1H-31P>, and 31P-1H>) of the new compounds are reported and discussed.
