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Reactions of the dinuclear palladium(I) complex, [Pd2(RNC)6](PF6)2 (R = 2,6-xylyl (Xyl), 2,4,6-mesityl (Mes)), with 1,1?-bis-(diphenylphosphino)ferrocene (dppf) gave dipalladium(I) complexes with dppf ligands, [Pd2(dppf)2(RNC)2](PF6)2 (1, R = Xyl, 66%; 2, R = Mes, 18%), which were characterized by elemental analysis, 1H- and 31P-NMR spectroscopy, IR and UV-vis absorption spectroscopic analyses, and cyclic voltammetry. The structure of 1 was characterized by X-ray crystallography. The cation of compound 1 is composed of two Pd(I) atoms joined by a Pd-Pd sigma-bond (2.602(1) A), and each palladium ion has a square planar structure ligated by a terminal isocyanide, two P atoms of dppf, and the neighboring Pd atom. The dppf ligands chelate to the metal with an average P-Pd-P bite angle of 99.19 and an average Pd…Fe distance of 4.236 A. The cyclopentadienyl rings of dppf ligands are in staggered form. The 1H- and 31P-NMR and the electronic absorption spectra of 1 and 2 indicated that the metal-metal bonded structure as observed in the crystal of 1 was retained in the solution. Complexes 1 and 2 were extremely photosensitive, and underwent a homolytic cleavage even under a room light. The reaction was monitored by the electronic absorption spectral changes and might generate a cation radical, [Pd(dppf)(RNC)]+. The cyclic voltammograms of 1 and 2 in acetonitrile solution showed two successive quasi-reversible oxidation waves at E1/2 = 0.60, 0.72 V (vs. Ag/AgPF6) (1) and 0.62, 0.73 V (2) and an irreversible reduction wave at E1/2 = -1.23 V (1) and -1.22 V (2). The former oxidation waves can be assigned to Fe(II)/Fe(III) processes of the two ferrocenyl groups and demonstrated that a charge-transfer communication between the Fe centers occurred through the Pd-Pd single bond.
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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate