Electronic properties of hydroquinone-containing ruthenium complexes in different oxidation states

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Tia E. Keyes, Pradeep M. Jayaweera, John J. McGarvey and Johannes G. Vos


Abstract

Some novel bis(2,2′-bipyridyl)ruthenium(II) complexes based on the ligands 1,4-dihydroxy-2,5-bis(pyrazol-1-yl)benzene (H2Lp) and 1,4-dihydroxy-2,3-bis(pyrazol-1-yl)benzene (H2Lo) have been prepared and characterized. The spectroscopic properties of the analogous H2Lp complex containing deuteriated 2,2′-bipyridyl were also studied. The compounds have been oxidized and the electronic properties associated with both oxidation states examined in detail using resonance-Raman and UV/VIS/NIR spectroscopy. In the parent compounds the first redox process is hydroquinone based and the lowest-energy absorption is assigned to a hydroquinone to 2,2′-bipyridyl interligand transition. The products obtained upon oxidation are best described as ruthenium(II)–quinone complexes and their lowest-energy transition is assigned to a RuII to quinone charge transfer.


References

  1. A. Juris, V. Balzani, F. Barigelletti, S. Campagna, P. Belser and A. von Zelewsky, Coord. Chem. Rev., 1988, 84, 85 CrossRef CAS; V. Balzani, A. Juris, M. Venturi, S. Campagna and S. Serroni, Chem. Rev., 1996, 96, 759 CrossRef CAS.
  2. M. Haga, E. S. Dodsworth and A. B. P. Lever, Inorg. Chem., 1986, 25, 447 CrossRef CAS; H. Masui, A. B. P. Lever and P. R. Auburn, Inorg. Chem., 1991, 30, 2402 CrossRef CAS.
  3. J. C. Jeffery and M. D. Ward, J. Chem. Soc., Dalton Trans., 1992, 2119 RSC; J. C. Jeffery, E. Schatz and M. D. Ward, J. Chem. Soc., Dalton Trans., 1992, 1921 RSC; B. M. Holligan, J. C. Jeffery, M. K. Norgett, E. Schatz and M. D. Ward, J. Chem. Soc., Dalton Trans., 1992, 3345 RSC; D. A. Bardwell, D. Black, J. C. Jeffery, E. Schatz and M. D. Ward, J. Chem. Soc., Dalton Trans., 1993, 2321 RSC.
  4. S. Ernst, P. Hanel, J. Jordanov, W. Kaim, V. Kasack and E. Roth, J. Am. Chem. Soc., 1989, 111, 1733 CrossRef CAS; M. Haga, Inorg. Chim. Acta, 1983, 75, 29 CrossRef CAS; A. M. El Handawy, Polyhedron, 1991, 10, 21 337; G. Juriga, M. Sattgast and M. E. McGuire, Inorg. Chim. Acta, 1991, 183, 39 CrossRef CAS; M. J. Ridd, D. J. Gakowski, G. E. Sneddon and F. R. Keen, J. Chem. Soc., Dalton Trans., 1992, 1949 RSC.
  5. T. E. Keyes and J. G. Vos, unpublished work.
  6. R. Wang, T. E. Keyes, R. Hage, R. H. Schmehl and J. G. Vos, J. Chem. Soc., Chem. Commun., 1993, 1652 RSC.
  7. B. O'Regan and M. Grätzel, Nature (London), 1991, 353, 737 CrossRef CAS.
  8. J. Catalan, F. Fabero, M. S. Guijarro, R. M. Claramount, M. D. Santa Maria, M. de la Concepcion Foces-Foces, F. H. Cano, J. Elguero and R. Sastre, J. Am. Chem. Soc., 1990, 112, 747 CrossRef CAS; P. Cornago, C. Escolastico, M. D. Santa Maria, R. M. Claramount, D. Carmona, M. Esteban, L. A. Oro, C. Foces-Foces, A. L. Llamas-Siaz and J. Elguero, J. Organomet. Chem., 1994, 467, 293 CrossRef CAS.
  9. R. A. McNicholl, J. J. McGarvey, A. H. R. Al-Obaidi, S. E. J. Bell, P. M. Jayaweera and C. G. Coates, J. Phys. Chem., 1995, 99, 12 268 CrossRef CAS.
  10. B. P. Sullivan, D. J. Salmon and T. J. Meyer, Inorg. Chem., 1978, 17, 3334 CrossRef CAS.
  11. T. E. Keyes, F. Weldon, E. Muller, P. Pechy, M. Grätzel and J. G. Vos, J. Chem. Soc., Dalton Trans., 1995, 2705 RSC.
  12. M. J. Clarke and M. G. Dowling, Inorg. Chem., 1991, 20, 3506.
  13. A. B. P. Lever, H. Masui, R. A. Metcalf, D. J. Stufkens, E. S. Dodsworth and P. R. Auburn, Coord. Chem. Rev., 1993, 125, 317 CrossRef CAS.
  14. D. P. Strommen, P. K. Mallick, G. D. Danzer, R. S. Lumpkin and H. J. R. Kincaid, J. Phys. Chem., 1990, 94, 1357 CrossRef CAS.
  15. K. Burger, Coordination Chemistry: Experimental Methods, Butterworths, London, 1973 Search PubMed; K. Nakamoto, IR and Raman Spectra of Inorganic and Coordination Compounds, Wiley-Interscience, New York, 4th edn., 1986 Search PubMed.
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