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Synthesis and solution characterization of [Ru(bpy)2]2+ modified polyazines.

Meng Cheng1, William B Euler

  • 1Department of Chemistry, 51 Lower College Road, University of Rhode Island, Kingston, Rhode Island 02881.

Inorganic Chemistry
|August 20, 2003
PubMed
Summary
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Ruthenium(II) polypyridyl complexes linked by azine units were synthesized. These metal-containing polymers exhibit unique electronic properties, including intervalence transfer, influenced by the metal centers.

Area of Science:

  • Coordination Chemistry
  • Polymer Science
  • Spectroscopy

Background:

  • Ruthenium(II) polypyridyl complexes are widely studied for their photophysical and electrochemical properties.
  • Azine-bridged polymers offer a versatile platform for constructing extended metal-containing systems.

Purpose of the Study:

  • To synthesize and characterize a series of ruthenium(II) polypyridyl complexes linked by azine units.
  • To investigate the electronic communication and properties of these polymers in the solution phase.

Main Methods:

  • Synthesis of polymers and dimer model compounds.
  • Electrochemical analysis using cyclic voltammetry.
  • Spectroscopic characterization including IR, NMR, and visible-NIR spectroscopy.
  • Density Functional Theory (DFT) calculations.

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Main Results:

  • Ruthenium(II) sites influenced main chain properties up to 15 Å.
  • The first oxidation was primarily ligand-centered but influenced by Ru(II).
  • Polymers exhibited a spectroscopic band consistent with intervalence transfer (IT), absent in dimer models.

Conclusions:

  • The IT transition in the polymers is assigned to a ligand-ligand transition spanning multiple repeat units.
  • The study highlights the electronic communication and unique properties of azine-bridged ruthenium polypyridyl polymers.