Picosecond structural relaxation of abietic acid based amine end capped para-phenylenevinylene trimers in solution.
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.
Di Paolo
Roberto E
RE
Centro de Química Estrutural, Departamento de Engenharia Química e Biológica, Instituto Superior Técnico, Lisboa, Portugal. roberto.paolo@ist.utl.pt
Gigante
Barbara
B
Esteves
Maria A
MA
Pires
Natércia
N
Santos
Célia
C
Lameiro
Maria H
MH
de Melo
João Seixas
JS
Burrows
Hugh D
HD
Maçanita
António L
AL
D045784:Abietanes / Q000737:chemistry*; D000588:Amines / Q000737:chemistry*; D005453:Fluorescence; D008968:Molecular Conformation; D010777:Photochemistry; D011145:Polyvinyls / Q000138:chemical synthesis / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods; D013696:Temperature; D013997:Time Factors
D045784:Abietanes; D000588:Amines; D011145:Polyvinyls; D012996:Solutions; D012997:Solvents; C470024:poly(4-phenylenevinylene); C023710:abietic acid