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Dimeric palladium complexes with bridging aryl groups: when are they stable?

Ana C Albéniz1, Pablo Espinet, Oscar López-Cimas

  • 1Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain. albeniz@qi.uva.es

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 19, 2004
PubMed
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Stable dimeric palladium(II) complexes with aryl bridges were synthesized and characterized. Ligand choice and aryl properties are key to stabilizing these palladium complexes, influencing their structure and solution behavior.

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Dimeric palladium(II) complexes are of interest due to their catalytic and structural properties.
  • Stabilizing bridging ligands in such complexes presents synthetic challenges.

Purpose of the Study:

  • To synthesize and characterize stable dimeric palladium(II) complexes with aryl bridges.
  • To investigate factors influencing the stability and structure of these complexes.

Main Methods:

  • Synthesis of palladium(II) complexes with general formula [Pd(2)(mu-R)(2)(eta(3)-allyl)(2)] where R=haloaryl or mesityl.
  • X-ray crystallography to determine complex structures.
  • Solution state NMR spectroscopy to study fluxional behavior.

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Main Results:

  • Stable dimeric palladium(II) complexes with haloaryl and mesityl bridges were successfully prepared.
  • X-ray structures revealed coplanar coordination square planes in most complexes.
  • Haloaryl complexes exhibited fluxional behavior in solution via solvent-assisted bridge splitting.
  • Attempts to use other ancillary ligands or bridging phenyls resulted in instability or alternative products.

Conclusions:

  • Stabilization of aryl bridges in dimeric palladium(II) complexes depends on ancillary ligand size and electronic properties, and aryl ligand reluctance to C-C coupling.
  • These factors are more critical than bridge strength for stabilizing bridging aryl complexes.