César A. Sierra, P. M. Lahti
2004
Citations
1
Influential Citations
25
Citations
Journal
Chemistry of Materials
Abstract
The syntheses and electronic spectroscopy of E,E-2,5-bis[2-hydroxyethoxy]-1,4-bis[2-(3,4,5-trimethoxyphenyl-1,2-ethenediyl]benzene, 3, and alternating block copolymer analogue alt-poly[1,8-octanedioxy-2,6-dimethoxy-1,4-phenylene-1,2-(E)-ethenediyl-2,5-(2-hydroxyethoxy)-1,4-phenylene-1,2-(E)-ethenediyl-3,5-dimethoxy-1,4-phenylene], 2, are described. Polymer 2 has UV−vis absorbances at 320 nm (shoulder) and 389 nm (maximum), with fluorescence emission at 449 nm (maximum) and 480 nm (shoulder) upon excitation at various wavelengths. Model compound 3 shows virtually identical spectral behavior. Neat solid films of polymer 2 show UV−vis absorbance in the 400−450-nm region (broad) and fluorescence at about 490 nm. The 40-nm shift from solution to neat film emission for 2 is attributed to hydrogen-bond-assisted interactions between chromophores in the solid state. The fluorescence quantum yields in chloroform at room temperature (365-nm excitation) for 2 and 3 are 0.36 and 0.74, respectively, relative to quinine...