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Issue 39, 2007
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Dinuclear palladium(II) complexes with bridging amidate ligands

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New homonuclear dimeric Pd(II) complexes have been synthesized by the reaction of Pd(en)2+ or Pd(bipy)2+ (where en = ethylenediamine and bipy = 2,2′-bipyridine) units with acetamide or by the Pd(II) mediated hydrolysis of CH3CN. In these dimers the two metal centers are bridged by either two amidates or by the combination of one hydroxo group and one amidate ligand. The crystal structures of complexes {[Pd(bipy)]2(µ-1,3-CH3CONH)2}(NO3)2·H2O·1/2(CH3)2CO·1/2CH3CN (3) and {[Pd(bipy)]2(µ-1,3-CH3CONH)2}(OTf)2 (4) showed intrametallic Pd–Pd distances of 2.8480(8) Å (3) and 2.8384(7) Å (4), respectively, in accordance with the accepted values for a strong Pd–Pd interaction. The presence of π⋯π interactions between the bipyridine ligands on the di-µ-amidate complexes of Pd(bipy)2+ shortens the distance between the two Pd centers and allows the formation of the metal–metal interaction. By contrast, the crystal structure of complex {[Pd(en)]2(µ-1,3-CH3CONH)2}(OTf)2·H2O (6), (where OTf = triflate) where there is no π⋯π interaction between the ligands on the metal centers, is also reported, and no Pd–Pd interaction is observed. Additionally, one of the complexes, {[Pd(en)]2(µ-OH)(µ-CH3CONH)}(NO3)2 (5), presents an interesting hydrogen bonded 3-D network formed by nitrate ions and water molecules. All complexes have been characterized by infrared and 1H NMR spectroscopy.

Graphical abstract: Dinuclear palladium(ii) complexes with bridging amidate ligands

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The article was received on 24 May 2007, accepted on 31 Aug 2007 and first published on 13 Sep 2007

Article type: Paper
DOI: 10.1039/B707878A
Citation: Dalton Trans., 2007,0, 4399-4404
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    Dinuclear palladium(II) complexes with bridging amidate ligands

    R. A. Adrian, S. Zhu, D. R. Powell, G. A. Broker, E. R. T. Tiekink and J. A. Walmsley, Dalton Trans., 2007, 0, 4399
    DOI: 10.1039/B707878A

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