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- W2022012134 abstract "Several novel Pd(II), Pt(II) and Pt(IV) dimers containing 1,2-bis(diphenylphosphino)acetylene (dppa) as bridging ligand have been prepared and characterized by X-ray diffraction methods, NMR spectroscopy (195Pt{1H}, 31P{H1H}), IR spectroscopy, elemental analyses and melting points. The X-ray structures of the former reported complexes [Pd2Cl4(dppa)2] (1) and [Pt2Cl4(dppa)2] (2) are given for the first time: 1: monoclinic, P21/n, a =14.401(3), b = 12.100(2), c = 15.880(3) Å, β = 91.36(3)°, Z = 2, R = 0.039 for 6432 observed reflections (1>3σ(1)); 2: orthorhombic, Pbcn, a = 13.995(3), b = 17.669(4), c== 21.960(4) Å, Z = 4, R = 0.052 for 2332 observed reflections (1>3σ(1)). These two X-ray structures are discussed with respect to the former given ambiguous interpretation of the X-ray structure of [PtPdCl4(dppa)2]. Replacement of the chlorides in 1 or 2 by iodides leads to [Pd2I4(dppa)2] (3) or [Pt2I4(dppa)2] (4). 4 is also fully characterized by an X-ray structure analysis for the first time: 4: monoclinic, P21/c, a = 10.586(2), b = 30.526(6), c = 18.383(4) Å, β = 100.09(3)°, Z = 4, R = 0.061 for 4698 observed reflections (1>3σ(1)). The X-ray structures of 1,2 and 4 reveal different orientations of the dppa bridges due to metal-phosphorus dπ-dπ back bonding leading to different angles between the square-planar coordination units, respectively. Replacement of the chlorides in 1 by NO2− leads to [Pd2(NO2)4(dppa)2] (5), whereas in 2 only one chloride can be substituted by NO2− and [Pt2Cl3(NO2) (dppa)2] (6) is formed. A similar reaction of 2 with 2,2′-bipyridine (bipy) produces [Pt2Cl2(dppa)2(bipy)](BF4)2 (7). Oxidation of 2 by chlorine gives the Pt(IV) dimer [Pt2Cl8(dppa)2] (8). An equimolar amount of PdCl2 reacts with one triple bond of 2 leading to [Pt2PdCl6(dppa)2] (9). an analogous manner [Pd4Cl8(dppa)2] (10) is formed from 1 and two equimolar amounts of PdCl2. The stability and reactivity of complexes 1–10 are discussed with respect to the X-ray structures of 1,2,4 and [PtPdCl4(dppa)2]." @default.
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- W2022012134 date "1997-03-01" @default.
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- W2022012134 title "Binuclear palladium(II), platinum(II) and platinum(IV) complexes containing 1,2-bis (diphenylphosphino)acetylene: different orientations of the diphosphine-bridges due to metal-phosphorus dπ-dπ back bonding" @default.
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- W2022012134 doi "https://doi.org/10.1016/s0020-1693(96)05449-7" @default.
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