Organic radical-induced Cu²⁺ selective sensing based on thiazolothiazole derivatives

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• 作者：Xin Zhang ; Minkyung Kang ; Hyun-A Choi ; Ji Young Jung ; K.M.K. Swamy ; Soojin Kim ; Dabin Kim ; Jinheung Kim ; Chongmok Lee ; Juyoung Yoon
• 关键词：Cu2+ sensor ; Organic radical ; Colorimetric sensor ; Fluorescent sensor ; Thiazolothiazole
• 刊名：Sensors and Actuators B: Chemical
• 出版年：1 March, 2014
• 年：2014
• 卷：192
• 期：Complete
• 页码：691-696
• 全文大小：1171 K

文摘

As a new approach to detect Cu²⁺, colorimetric detection of Cu²⁺ via organo radical formation of thiazolothiazole is reported. Upon the addition of Cu²⁺, thiazolothiazole derivatives 1 and 2 form relatively stable organo radicals, resulting in a distinct colorimetric change from greenish yellow to blue. Among the various metal ions, only Cu²⁺ showed a new peak appearance at 610 nm. In addition, a selective fluorescence quenching was also observed with Cu²⁺. To understand the origin of the Cu²⁺ selectivity of 1 and 2, series of electrochemical data are reported. Finally, EPR (electron paramagnetic resonance) data clearly support the formation of this unique organic radical formation.