Synthesis and energy-transfer properties of poly(amidoamine) dendrons modified with naphthyl and dansyl groups
作者:Wu-Song Li、Ming-Jun Teng、Xin-Ru Jia、Bing-Bing Wang、Jui-Ming Yeh、Yen Wei
DOI:10.1016/j.tetlet.2008.01.083
日期:2008.3
Poly(amidoamine) dendrons of 1-3 generations with naphthyl groups at the periphery and a dansyl group at the focal point were synthesized and carefully characterized. Intramolecular energy-transfer properties of these flexible aliphatic-scaffold light-harvesting dendrons were investigated by UV-vis absorption and fluorescence spectroscopy. Efficient energy transfer from the naphthyl groups to the dansyl group occurred for both the first and the second generation dendrons (the energy-transfer efficiency was 94.3% and 76.9%, respectively), whereas the third generation dendron exhibited a low energy-transfer efficiency of 17.8%. The average donor-acceptor distances between the naphthyl and dansyl groups were calculated for different generation dendrons. Different degrees of the backfolding of dendritic branches were used to interpret the different donor-acceptor distances. (c) 2008 Elsevier Ltd. All rights reserved.