Semiconductor Photochemistry And Photophysics by V. Ramamurthy, Kirk S. Schanze

By V. Ramamurthy, Kirk S. Schanze

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A 2000, 104, 4256. 10. ; Freund, M. ; Gray, H. ; Winkler, J. ; Lewis, N. S. J. Phys. Chem. B 2001, 105, 392. 11. ; Bignozzi, C. ; Heimer, T. ; Castellano, F. ; Meyer, G. J. J. Am. Chem. Soc. 1995, 117, 11,815. 12. ; Bignozzi, C. ; Heimer, T. ; Castellano, F. ; Meyer, G. J. J. Phys. Chem. B 1997, 101, 2591. 13. ; Scandola, F. Supramolecular Photochemistry; Horwood: Chichester, 1991. 14. ; Bignozzi, C. ; Scandola, F. J. Am. Chem. Soc. 1990, 112, 7099. 15.

Nonconjugated polymers with pendant ligands capable of complexing transition metals, so-called metallopolymers [75], have been prepared as electrochromic materials using both reductive and oxidative electropolymerisation techniques [76]. The electrochromic effect is due to the changes in the absorption bands of the complexes upon oxidation and reduction of the metal. Attachment of the chromophores to a polymer backbone facilitates the preparation of all-solid-state systems. Iron, ruthenium, and osmium have shown interesting results, usually in combination with polypyridyl ligands, such as bipyridyl, terpyridyl, or phenanthroline.

In both cases, the molecular design is closely correlated to specific features expected for the device and should meet requirements such as light absorption, vectorial energy and electron transfer, and assembling of suitable redox components. The study of these heterogeneous systems is essential to a better understanding of the surface photochemical or electrochemical processes and can provide the basis for the design of novel microheterogeneous assemblies with great potential for a variety of applications.

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