Browsing by Author "Wang, Yu-Yun"

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A Bifunctional Chromogenic Calix[4]arene Chemosensor for Both Cations and Anions: A Potential Ca(2+) and F(-) Switched INHIBIT Logic Gate with a YES Logic Function
(2010-08-01)
Chang, Kai-Chi
;
Su, In-Hao
;
Wang, Yu-Yun
;
Chung, Wen-Sheng
;
應用化學系
A bifunctional chromogenic calix[4]arene 3, which contains both triazoles and hydroxy azophenols as both cationic and anionic recognition sites and the azophenol moiety as a coloration unit, was designed and synthesized. The recognition of Ca(2+) by 3 gave rise to a marked colour change from greenish to bright yellow, whereas the recognition of F(-) by 3 showed a colour change from light green to bluish. The colour changes of 3 by the inputs of Ca(2+) and F- have been implemented to construct a combinational logic circuit at the molecular level.
A Bifunctional Chromogenic Calix[4]arene Chemosensor for Both Cations and Anions: A Potential Ca2+ and F- Switched INHIBIT Logic Gate with a YES Logic Function
(2010-08-01)
Chang, Kai-Chi
;
Su, In-Hao
;
Wang, Yu-Yun
;
Chung, Wen-Sheng
;
應用化學系
A bifunctional chromogenic calix[4]arene 3, which contains both triazoles and hydroxy azophenols as both cationic and anionic recognition sites and the azophenol moiety as a coloration unit, was designed and synthesized. The recognition of Ca2+ by 3 gave rise to a marked colour change from greenish to bright yellow, whereas the recognition of F- by 3 showed a colour change from light green to bluish. The colour changes of 3 by the inputs of Ca2+ and F- have been implemented to construct a combinational logic circuit at the molecular level.
Highly Selective Fluorescent Sensors for Hg(2+) and Ag(+) Based on Bis-triazole-Coupled Polyoxyethylenes in MeOH Solution
(2009-12-01)
Hung, Hao-Chih
;
Cheng, Chi-Wen
;
Wang, Yu-Yun
;
Chen, Yu-Jen
;
Chung, Wen-Sheng
Fluorescent chemosensors 6-9, with variable length polyoxyethylenes between two triazolylmethyl ether units, have been synthesized under "click" conditions in which the bis-triazoles and polyoxyethylenes were used as metal-ion binding sites and the pyrenes as fluorophores. Of the 15 metal ions screened, the fluorescence of chemosensors 6-9 in methanol solution was found to be selectively quenched by only Hg(2+) and Ag(+). In contrast, the fluorescence of control compound 10, a [(triazol-4-yl)methoxymethyl]pyrene, was quenched by only Hg(2+). These results imply that the recognition of Hg(2+) does not need the cooperation of two triazole groups. Binding constants for the interactions of 6-9 with Ag(+) increased as the chain length of the polyoxyethylene increased. Finally, a very high selectivity of compound 9 towards Hg(2+) in aqueous methanol solution was observed. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Highly Selective Fluorescent Sensors for Hg2+ and Ag+ Based on Bis-triazole-Coupled Polyoxyethylenes in MeOH Solution
(2009-12-01)
Hung, Hao-Chih
;
Cheng, Chi-Wen
;
Wang, Yu-Yun
;
Chen, Yu-Jen
;
Chung, Wen-Sheng
Fluorescent chemosensors 6-9, with variable length polyoxyethylenes between two triazolylmethyl ether units, have been synthesized under "click" conditions in which the bis-triazoles and polyoxyethylenes were used as metal-ion binding sites and the pyrenes as fluorophores. Of the 15 metal ions screened, the fluorescence of chemosensors 6-9 in methanol solution was found to be selectively quenched by only Hg2+ and Ag+. In contrast, the fluorescence of control compound 10, a [(triazol-4-yl)methoxymethyl]pyrene, was quenched by only Hg2+. These results imply that the recognition of Hg2+ does not need the cooperation of two triazole groups. Binding constants for the interactions of 6-9 with Ag+ increased as the chain length of the polyoxyethylene increased. Finally, a very high selectivity of compound 9 towards Hg2+ in aqueous methanol solution was observed. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)