Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India.
Inorg Chem. 2011 Aug 1;50(15):7066-73. doi: 10.1021/ic200573m. Epub 2011 Jun 27.
The synthesis, electrochemical, optical, and metal-cation-sensing properties of ferrocene-glycine conjugates C(30)H(38)O(8)N(8)Fe (2) and C(20)H(24)O(4)N(4)Fe (3) have been documented. Both compounds 2 and 3 behave as very selective redox (ΔE(1/2) = 217 mV for 2 and ΔE(1/2) = 160 mV for 3), chromogenic, and fluorescent chemosensors for Hg(2+) 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, ε = 1600 M(-1) cm(-1); 3, ε = 822 M(-1) cm(-1)). This is also accompanied by a strong color change from yellow to purple, which allows a prospective for the "naked eye" detection of Hg(2+) cations. These chemosensors present immense brightness and fluorescence enhancement (chelation-enhanced fluorescence = 91 for 2 and 42 for 3) following Hg(2+) coordination within the limit of detection for Hg(2+) at 7.5 parts per billion.
报道了二茂铁-甘氨酸缀合物 C(30)H(38)O(8)N(8)Fe(2)和 C(20)H(24)O(4)N(4)Fe(3)的合成、电化学、光学和金属阳离子传感性质。化合物 2 和 3 均表现出对 Hg(2+)阳离子非常选择性的氧化还原（ΔE(1/2)为 217 mV 的 2 和 ΔE(1/2)为 160 mV 的 3）、显色和荧光化学传感器，在水相环境中。它们吸收光谱的显著变化伴随着新的低能量峰在 630nm 处的出现（2，ε=1600 M(-1)cm(-1)；3，ε=822 M(-1)cm(-1)）。这也伴随着从黄色到紫色的强烈颜色变化，这使得对 Hg(2+)阳离子的“肉眼”检测成为可能。这些化学传感器在 Hg(2+)配位后呈现出巨大的亮度和荧光增强（2 的螯合增强荧光=91，3 的螯合增强荧光=42），Hg(2+)的检测限为 7.5 十亿分之几。
