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Revista de la Sociedad Química de México
versão impressa ISSN 0583-7693
Resumo
RIVERA, Ernesto. Study of the Influence of the Polyacetylene Main Chain Configuration and the Internal Stacking of Pendant Groups over the Optical and Photophysical Properties of trans and cis-Poly(1-pyrenylacetylene)s by UV-Vis and Fluorescence Spectroscopy. Rev. Soc. Quím. Méx [online]. 2004, vol.48, n.1, pp.38-45. ISSN 0583-7693.
The influence of the polyacetylene backbone configuration and the internal stacking of pendant groups over the optical and photophysical properties of trans-poly(1-ethynylpyrene) (trans-PEP) and cis-poly(1-ethynylpyrene) (cis-PEP) was studied by UV-vis and fluorescence spectroscopy. From the absorption spectra of both polymers, it was found that trans-PEP possesses a higher degree of conjugation than its cis analogue. Besides, intramolecular interactions occur between the pendant pyrene units (associated pyrenes) present in each polymer, giving rise to a new emission. These interactions are stronger in cis-PEP due to a coiling of the main polyacetylene chain. Excitation spectra jointly with fluorescence decay profiles show that these interactions occur in the ground state (static excimer).
Palavras-chave : Intramolecular interactions; polyarylacetylenes; pyrene; UV-vis; fluorescence.