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Issue 10, 2002
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Photoinduced charge separation in R–CO2–Re(CO)3(2,2′-bipyridine) complexes. Two emitting charge transfer excited states

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Abstract

Excited state properties of the newly prepared complexes R–CO2–Re(CO)3(2,2′-bipy), where R–CO2 = naphthalene-2-carboxylate, anthracene-9-carboxylate, pyrene-1-carboxylate and acetate, were investigated by steady state and time resolved spectroscopy. The X-ray structure revealed that the R containing ligand is coordinated through the carboxylate group to Re(I). Results showed that two emitting excited states play a major role in the photophysics of the complexes. The fast component of the complexes luminescence was associated with the charge transfer excited state, MLCT, Re-to-2,2′-bipyridine, while experimental evidence led to the long lived component being attributed to a ligand-to-ligand charge transfer excited state. This emissive LLCT excited state can also evolve to a photodissociative state which ultimately produces the complex decarboxylation. On the other hand, the carboxylate bridge was shown to be able to impede connection between R and the Re(CO)3(2,2′-bipy) chromophore.

Graphical abstract: Photoinduced charge separation in R–CO2–Re(CO)3(2,2′-bipyridine) complexes. Two emitting charge transfer excited states

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Publication details

The article was received on 14 Sep 2001, accepted on 21 Feb 2002 and first published on 23 Apr 2002


Article type: Paper
DOI: 10.1039/B108349J
J. Chem. Soc., Dalton Trans., 2002, 2194-2202

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    Photoinduced charge separation in R–CO2–Re(CO)3(2,2′-bipyridine) complexes. Two emitting charge transfer excited states

    E. Wolcan, G. Torchia, J. Tocho, O. E. Piro, P. Juliarena, G. Ruiz and M. R. Féliz, J. Chem. Soc., Dalton Trans., 2002, 2194
    DOI: 10.1039/B108349J

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