| Autor: |
Cameron, C. G., Pittman, T. J., Pickup, P. G. |
| Zdroj: |
The Journal of Physical Chemistry - Part B; September 2001, Vol. 105 Issue: 37 p8838-8844, 7p |
| Abstrakt: |
A series of conjugated polymer−redox polymer hybrids based on the complexation of poly-(bibenzimidazoles) with bis-(2,2-bipyridyl)Ru2+ and bis-(2,2-bipyridyl)Os2+ has been prepared to investigate the effects of electronic communication between metal centers through the conjugated backbone. Electron transport rates in the mixed valence M(III/II) states have been measured as electron diffusion coefficients (De) by impedance spectroscopy and dual (sandwich) electrode voltammetry. De values are generally higher than for nonconjugated Ru(2,2-bipyridyl)33+/2+-type polymers, and their dependencies on the metal (Os or Ru), pH and nature of the polymer backbone are consistent with significant contributions from superexchange mechanisms. Hole-type superexchange appears to dominate in the Ru polymers, while a number of observations indicate that electron-type superexchange may dominate for the Os complexes. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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