Ion-mediated single-molecular optical switching and sensing based on the fluorophore-tethered calix[4]pyrrole
作者:Divya Sareen、Ji Hye Lee、Hyonseok Hwang、Soeun Yoo、Chang-Hee Lee
DOI:10.1039/c6cc01679k
日期:——
The design and synthesis of the first asymmetrically "two-walled" meso-substituted calix[4]pyrrole tethered by fluorophore and its subsequent implication as an archetype sequential 'on-off-on-off' fluorescent single-molecular switch is reported. Current system...
The eco-friendly and selective syntheses of 5-methyl-5-aryldipyrromethanes (1-4) in which aryl is FC6H4 1, ClC6H5 2, CH3OC6H5 3 and CH3C6H5 4, have been reported in the presence of citric acid (weak organic acid) and characterised by IR, H-1 NMR, C-13 NMR and mass spectroscopy. The structures of 2-4 have been confirmed by X-ray crystallography. Anion binding studies of 1-4 with different anions (e.g. F-, Cl-, CH3COO-, and ) have been carried out by H-1 NMR titrations and binding constants have been evaluated using EQNMR program, revealing that they bind fluoride selectively compared with other anions with 1:1 stoichiometry in CDCl3. The binding affinities of these compounds are influenced by the nature of the substituent on the meso-carbon atom.
Salt (LiF) Regulated Fluorescence Switching
作者:Punidha Sokkalingam、Jaeduk Yoo、Hyonseok Hwang、Phil Ho Lee、Young Mee Jung、Chang-Hee Lee
DOI:10.1002/ejoc.201100359
日期:2011.6
A supramolecular host-guest complex stimulated by lithium cation and fluoride anion, functioning as reliable fluorescence "Off-On-Off" switching system has been developed. Nonfluorescent, receptor-bound fluorophore is exclusively displaced by second guest, fluoride anion to release the fluorophore that becomes highly fluorescent in guest concentration dependent way. Again, this process is completely
已开发出一种由锂阳离子和氟阴离子刺激的超分子主客体复合物,可用作可靠的荧光“关-开-关”切换系统。非荧光的、受体结合的荧光团被第二客体氟阴离子完全取代,以释放荧光团,该荧光团以客体浓度依赖的方式变得高度荧光。同样,这个过程在暴露于 Li + 时完全逆转。整个过程是基于荧光的逻辑系统的优秀模型。