Issue 10, 2002

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

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

Supplementary files

Article information

Article type
Paper
Submitted
14 Sep 2001
Accepted
21 Feb 2002
First published
23 Apr 2002

J. Chem. Soc., Dalton Trans., 2002, 2194-2202

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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