LOCALIZED ELECTRONIC EXCITATIONS IN PHENYLACETYLENE DENDRIMERS

Electron-hole pairs created upon optical excitation of conjugated dend rimers (fractal antenna macromolecules) are shown to be localized with in segments connected by benzene rings substituted at the meta-positio n. The absorption spectra of two families of dendrimers are analyzed u sing collective electronic normal modes representing the changes in ch arge and bond-order distributions induced by the optical field. The pr esent approach may be used in the design of artificial light-harvestin g antennae with controlled energy-funneling pathways.