School of Chemistry and Chemical Engineering, Central South University, Changsha, People's Republic of China.
J Fluoresc. 2011 Jan;21(1):141-8. doi: 10.1007/s10895-010-0698-x. Epub 2010 Jul 20.
A novel chromogenic and fluorogenic chemosensor RhB-pMOSal comprising a rhodamine fluorophore and a salicylaldehyde receptor being connected by an iminohydrazine link was synthesized and fully characterized. Its sensing behavior toward various metal ions in neutral aqueous solution was investigated by absorption and fluorescence spectroscopy. RhB-pMOSal exhibited a reversible and sensitive "turn-on" response of absorption and fluorescence toward Cu(2+) in aqueous acetonitrile solution. Approximate 65 and 6-fold enhancement in the absorbance at 556 nm and fluorescence intensity at 573 nm were estimated when equivalent Cu(2+) was added to the RhB-pMOSal solution. Under the same conditions, RhB-pMOSal displayed more sensitive than a reported analogue RhB-Sal to Cu(2+) ion. The competition experiments for Cu(2+) mixed with common metal ions exhibited no obvious change in absorption and emission except Cr(3+) ion that can induce the fluorescence quenching of RhB-pMOSal to some extent.
一种新型的比色和荧光化学传感器 RhB-pMOSal，由一个罗丹明荧光团和一个水杨醛受体通过亚氨基腙键连接而成，已被合成并进行了充分的表征。通过吸收和荧光光谱法研究了其在中性水溶液中对各种金属离子的传感行为。在水-乙腈溶液中，RhB-pMOSal 对 Cu(2+)表现出可逆和灵敏的“开-关”响应，在 556nm 处的吸收和 573nm 处的荧光强度分别有约 65 倍和 6 倍的增强。在相同条件下，与报道的 RhB-Sal 类似物相比，RhB-pMOSal 对 Cu(2+)离子的灵敏度更高。与常见金属离子混合的 Cu(2+)的竞争实验除了 Cr(3+)离子外，在吸收和发射方面没有明显变化，Cr(3+)离子在一定程度上可以引起 RhB-pMOSal 的荧光猝灭。
