Picosecond Structural Relaxation of Abietic Acid Based Amine End Capped Para-Ph...

• Autor(es): Paolo, Roberto E. Di ; Gigante, Barbara ; Esteves, Maria A. ; Pires, Natércia ; Santos, Célia ; Lameiro, Maria H. ; Melo, João Seixas de ; Burrows, Hugh D. ; Maçanita, António L.
• Data: 2008
• Identificador Persistente: http://hdl.handle.net/10316/8250
• Origem: Estudo Geral - Universidade de Coimbra
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

The synthesis and photophysical properties of six new abietic acid based amine end-capped p-phenylenevinylene trimers (AECPV3) in their lowest excited singlet states are presented. The AECPV3 compounds show a large red-shift of both the absorption (25-30 nm) and emission (37-42 nm) maxima with respect to those of the corresponding trimers. Picosecond time-resolved fluorescence data reveal the presence of a fast conformational relaxation process (40-62 ps) of the initially excited compounds, leading to more planar conformers. The conformational relaxation time is proportional to the volume of both the side chain and the amine groups. http://dx.doi.org/10.1002/cphc.200800374