期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 150, 期 2, 页码 655-666出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.08.023
关键词
1 8 Naphthalimide; Polyamidoamine (PAMAM); Fluorescence; Light harvesting antennae; Energy transfer; pH sensing; Photoinduced electron transfer (PET)
资金
- National Science Foundation of Bulgaria [VU-X-201/06]
- Science Foundation at the University of Chemical Technology and Metallurgy (Sofia Bulgaria)
This work presents the design convergent synthesis and spectral characteristics of novel PAMAM dendrons core and peripherally functionalized with 1 8-naphthalimide fluorophores The novel compounds were configured as light-harvesting antennae where the system surface is labeled with a different number of blue-emitting 4-allyloxy-1 8-naphthalimide donor fluorophores capable of absorbing light and efficiently transferring the energy to a single yellow-green emitting 4-alkylamino-1 8-naphthalimide acceptor dye The overlap between the blue emission of the donor periphery and the absorption of the acceptor (focal dye) was more than 95% Novel light-harvesting systems showed highly efficient energy transfer (91-94%) Nevertheless fluorescence quenching of the core chromophore was observed which is related to a possible photoinduced electron transfer (PET) from the 4-alkoxy-1 8-naphthalimide periphery towards the focal 4-alkylamino-1 8-naphthalimide Novel PAMAM light-harvesting systems were also configured in a fluorophore-spacer-receptor format and as such displayed sensitive fluorescence signaling over a wide pH scale which is attributed to a PET process from the tertiary amines in the dendron bone to the fluorophores This assigns the synthesized light-harvesting antennae to potential use as highly efficient pH chemosensing materials (C) 2010 Elsevier B V All rights reserved
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