SciELO - Scientific Electronic Library Online

vol.17 issue8Resonance Raman spectroscopy of FeII FeIII and FeIII FeIII model complexes containing an unsymmetrical dinucleating ligand: a biomimetic redox pair for uteroferrinCatalytic activity in oxidation reactions of anionic iron(III) porphyrins immobilized on raw and grafted chrysotile author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053On-line version ISSN 1678-4790


FRIN, Karina M.  and  IHA, Neyde Y. Murakami. Photoinduced isomerization and luminescence of fac-[Re(CO)3(ph2phen)(bpe)]+. J. Braz. Chem. Soc. [online]. 2006, vol.17, n.8, pp.1664-1671. ISSN 0103-5053.

The fac-[Re(CO)3(ph2phen)(trans-bpe)]PF 6 complex, ph2phen = 4,7-diphenyl-1,10-phenanthroline and trans-bpe = trans-1,2-bis(4-pyridyl)ethylene, was synthesized, characterized and its photochemical and photophysical behavior was investigated. This complex exhibits trans®cis photoisomerization of the coordinated trans-bpe ligand. The apparent quantum yields in CH3CN, determined by absorption changes, are F313 nm = 0.19 ± 0.02, F365 nm = 0.18 ± 0.04 and F404 nm = 0.18 ± 0.02. Higher true quantum yields (F365 nm = 0.40 ± 0.06) were determined by 1H NMR spectroscopy. The coordination of the trans-bpe ligand to the rhenium(I) polypyridyl complex enables a photosensitized isomerization under a lower energy region irradiation, where the free ligand does not absorb. The increasing luminescence as the photoproduct, fac-[Re(CO)3(ph2phen)(cis-bpe)] +, is formed is ascribed to the change of the lowest lying excited state from 3IL to 3MLCT. The emission exhibits a hypsochromic shift associated with the rigidochromic effect.

Keywords : photoisomerization; rhenium(I) carbonyl complexes; trans-bpe; luminescence; rigidochromic effect.

        · abstract in Portuguese     · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License