Abstract
Two dinuclear complexes of palladium(I) and platinum(II) have been prepared by using a tridentate ligand containing three kinds of coordination sites, i.e. oxygen, nitrogen, and phosphorus atoms. Treatment of palladium(II) acetate with a mixture of 6-(diphenylphosphino)-2-pyridone (abbreviated as PyphosH) and sodium methoxide in diglyme produced a dimeric palladium(I) complex containing a metal−metal bond, Pd2(pyphos)2(pyphosH)2 (1), in 43% yield. The dinuclear complex 1 has a Pd−Pd single bond [2.623(1) A] surrounded by two pyphos ligands and two pyphosH ligands, where the pyphos ligand connected to pyphosH through an intramolecular hydrogen bond [1: monoclinic, space group C2/c with a = 19.794(7) A, b = 14.753(7) A, c = 25.626(5) A, β = 107.65(2)°, V = 7131(4) A3, Z = 4, and R = 0.058 for 4760 reflections with I > 3σ(I) and 451 parameters]. In the case of platinum, a dinuclear platinum(II) complex, Pt2(pyphos)4 (3), was prepared in 84% yield by treatment of PtCl2(pyphosH)2 (2) with 2 equiv of sodium me...
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