期刊
DYES AND PIGMENTS
卷 81, 期 1, 页码 18-26出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2008.08.009
关键词
1,8-Naphthalimide; Polyamidoamine (PAMAM); Fluorescence; Light harvesting antenna; pH sensing; Photoinduced electron transfer (PET)
资金
- National Science Foundation of Bulgaria [VU-X-201/06]
- University of Chemical Technology and Metallurgy (Sofia, Bulgaria)
The system surface was labeled with blue emitting 1,8-naphthalimide donor dyes capable of absorbing light and efficiently transferring the energy to a single yellow-green emitting 1,8-naphthalimide acceptor dye. The overlap between the blue emission of the donor and the absorbance of the acceptor (focal dye) was >70%. Due to the energy transfer from the periphery to the focal 1,8-naphthalimide chromophore (67%) the core fluorescence (lambda(ex) = 360 nm) was enhanced >36 times. It was also found that the novel light harvesting system displayed sensitive fluorescence signaling over a wide pH scale, which was ascribed to photoinduced electron transfer from the dendron bone to the blue emitting periphery. In acidic media the electron transfer was switched off and, in turn, the periphery emission was switched on, resulting in energy transfer enhancement to the focal chromophore up to 92%. This indicates the high potential of the novel light harvesting system as an efficient pH hemosensing material. (C) 2008 Elsevier Ltd. All rights reserved.
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