180777-29-1Relevant academic research and scientific papers
Dinuclear Pd(I)-Pd(I) and Pt(II)...Pt(II) Complexes Supported by Tridentate Pyphos Ligands (Pyphos = 6-(Diphenylphosphino)-2-pyridonate)
Mashima, Kazushi,Tanaka, Mitsuhiro,Tani, Kazuhide,Nakano, Hiroshi,Nakamura, Akira
, p. 5244 - 5248 (2008/10/09)
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 PtCh2-(pyphosH)2 (2) with 2 equiv of sodium methoxide in ethanol. The dimeric structure of 3 was confirmed by X-ray analysis. The interatomic distance between the two platinum atoms of 3 is 4.3615(6) A. Thus, complex 3 does not contain any metal-metal bond [3: monoclinic, space group C2/c with a = 19.646(2) A, b = 11.411-(4) A, c = 30.368(3) A, β= 109.782(8)°, V = 6406(1) A3, Z = 4, R = 0.046 for 5844 reflections with I > 3σ(I) and 425 parameters].
