Browsing by Author "Wang, Hsuan-Fu"

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A Pyrene-based Highly Selective Turn-on Fluorescent Chemosensor for Iron(III) Ions and its Application in Living Cell Imaging
(2013-11-01)
Chung, Peter Kun
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Liu, Shi-Rong
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Wang, Hsuan-Fu
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Wu, Shu-Pao
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應用化學系
A new pyrene-based chemosensor (1) exhibits excellent selectivity for Fe3+ ions over a wide range of tested metal ions Ag+, Ca2+, Cd2+, Co2+, Cu2+, Fe2+, Hg2+, K+, Mg2+, Mn2+, Ni2+, Pb2+, and Zn2+. The binding of Fe3+ to chemosensor 1 produces an emission band at 507 nm due to the formation of a Py-Py* excimer that is induced by Fe3+-binding. The binding ratio of 1-Fe3+ was determined to be 1:1 from a Job plot. The association constant of 1-Fe3+ complexes was found to be 1.27 x 10(4) M-1 from a Benesi-Hildebrand plot. In addition, fluorescence microscopy experiments show that 1 can be used as a fluorescent probe for detecting Fe3+ in living cells.
A pyrene-based highly selective turn-on fluorescent sensor for copper(II) ions and its application in living cell imaging
(2013-05-01)
Wang, Hsuan-Fu
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Wu, Shu-Pao
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應用化學系
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Department of Applied Chemistry
A new pyrene derivative (1) containing a benzothiazolenhydrazone moiety exhibited high selectivity for Cu2+ detection. In the presence of Cu2+, chemosensor 1 provided significant fluorescence enhancement, while Ag+, Ca2+, Cd2+, Co2+, Fe2+, Fe3+, Hg2+, K+, Mg2+, Mn2+, Ni2+, Pb2+, and Zn2+ metal ions produced only minor changes in fluorescence intensity. The association constant (K-a) for Cu2+ binding to 1 had a value of 5.00 x 10(8) M-2. The maximum fluorescence enhancement induced by Cu2+ binding to the chemosensor was observed over the range pH 2-8.5. Our fluorescence microscopy experiments demonstrate that chemosensor 1 may have application as a fluorescent probe for detecting Cu2+ in living cells. (c) 2013 Elsevier B.V. All rights reserved.
Highly selective fluorescent sensors for mercury(II) ions and their applications in living cell imaging
(2013-02-25)
Wang, Hsuan-Fu
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Wu, Shu-Pao
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應用化學系
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Department of Applied Chemistry
Three new pyrene derivatives (MS1, MS2, and MS3) containing two triazole units exhibited fluorescence quenching in the presence of Hg2+ ions. Other metal ions Ag+, Ca2+, Cd2+,Co2+, Cu2+, Fe2+, Fe3+, K+, Mg2+, Mn2+, Na+, Ni2+, Pb2+, Rb+, and Zn2+ produced only minor changes in the fluorescence of MS1, MS2, and MS3. The binding ratio of the chemosensor-Hg2+ complexes was found to be 1:1 according to Job plot experiments. The association constants (K-a) of chemosensor-Hg2+ complexes were found to be 1.68x10(3) M-1 (MS1), 1.57x10(3) M-1 (MS2), and 1.52x10(3) M-1 (MS3), respectively. Moreover, fluorescence microscopy experiments showed that MS1 could be used as a fluorescent probe for detecting Hg2+ in living cells. (C) 2013 Elsevier Ltd. All rights reserved.