Reference of 14871-92-2, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14871-92-2, Name is (2,2¡ä-Bipyridine)dichloropalladium(II), molecular formula is C10H8Cl2N2Pd. In a Article£¬once mentioned of 14871-92-2
Di- and tripalladium(II) and -platinum(II) complexes containing 7-amino- 1,8-naphthyridin-2-one as a bridging ligand – Oxidation of a [Pt3]6+ core to [Pt3]8+
All three dinuclear complexes [Pd2(donp)2(bpy)2] (1) (H2donp = 1,8- naphthyridin-2,7-dione), [Pd2(H2nonp)2(bpy)2](ClO4)2 (2), and [Pt2(H2nonp)2(bpy)2](PF6)2 (3) (H3nonp = 7-amino-1,8-naphthyridin-2- one) exhibit the mu-1kappaN1:2kappaN8 bridging mode for their head/tail orientated naphthyridine ligands. Whereas 1 and 3 may be prepared by direct reaction of the dinucleating ligand with [MCl2(bpy)], formation of competing tripalladium(II) complexes must be avoided for 2 by employment of the precursor H2acnonp (7-acetamido-1,8-naphthyridin-2-one), which affords [H2nonp]- on cleavage of its original acetyl group. A mixture of the head/tail (4a) and head/head (4b) isomers of [Pd3(Hnonp)2(bpy)3](ClO4)2 is obtained when H3nonp is treated with [PdCl2(bpy)] and LiOH at room temperature for 2 d, followed by precipitation with LiClO4. Contrastingly exclusive formation of 4a is observed upon refluxing this reaction mixture for 3 d in aqueous solution. The [Hnonp]2- ligands exhibit a mu3- 1kappaN1:2kappaN8:3kappaN7 bridging mode that leads to short Pd ¡¤¡¤¡¤ Pd interactions of 2.781(2) and 2.775(2) A. Similar metal-metal distances of 2.771(3) and 2.816(3) A are observed in head/head- [Pt3(acnonp)(Hnonp)(bpy)3]Cl2 (5). An in situ 2e–oxidation (Ag+/Ag) of the [Pt3]6+ core in triplatinum(II) species such as 5 formed by the reaction of [PtCl2(bpy)] with H2acnonp allows the isolation of diamagnetic dark-brown head/head-[Pt3(Hnonp)2(NO3)(bpy)3](ClO4)2 (NO3) (6) with an average oxidation state of Pt (2.67+). The Pt-Pt distances of 2.723(2) and 2.670(2) A are markedly shorter than in 5.
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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method