A Highly Selective Redox, Chromogenic, and Fluorescent Chemosensor for Hg2+ in Aqueous Solution Based on Ferrocene鈥揋lycine Bioconjugates

详细信息    查看全文

• 作者：Arunabha Thakur ; Sinjinee Sardar ; Sundargopal Ghosh
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：August 1, 2011
• 年：2011
• 卷：50
• 期：15
• 页码：7066-7073
• 全文大小：1087K
• 年卷期：v.50,no.15(August 1, 2011)
• ISSN：1520-510X

文摘

The synthesis, electrochemical, optical, and metal-cation-sensing properties of ferrocene鈥揼lycine conjugates C₃₀H₃₈O₈N₈Fe (2) and C₂₀H₂₄O₄N₄Fe (3) have been documented. Both compounds 2 and 3 behave as very selective redox (螖E_1/2 = 217 mV for 2 and 螖E_1/2 = 160 mV for 3), chromogenic, and fluorescent chemosensors for Hg²⁺ cations in an aqueous environment. The considerable changes in their absorption spectra are accompanied by the appearance of a new low-energy peak at 630 nm (2, 蔚 = 1600 M^鈥? cm^鈥?; 3, 蔚 = 822 M^鈥? cm^鈥?). This is also accompanied by a strong color change from yellow to purple, which allows a prospective for the 鈥渘aked eye鈥?detection of Hg²⁺ cations. These chemosensors present immense brightness and fluorescence enhancement (chelation-enhanced fluorescence = 91 for 2 and 42 for 3) following Hg²⁺ coordination within the limit of detection for Hg²⁺ at 7.5 parts per billion.