Interaction of Sulfonated Calix[n]arenes with Rhodamine B and Its Application to Determine Acetylcholine in a Real Neutral Aqueous Medium
✍ Scribed by Yong-Jun Zhang; Wei-Xiao Cao; Jian Xu
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 284 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0256-7660
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Complexation between Rhodamine B (RB) and sulfonated calix [n] arenes (SC__n__A) were studied by means of UV‐vis spectroscopy and fluorescence spectroscopy. In the presence of sulfonated calix[n] arenes, the absorption band of Rhodamine B shifts to longer wavelength and its intensity decreases. The formation of a host‐guest type complex also results in the fluorescence quenching of Rhodamine B. The association constants for the RB/SC__n__A complexes increase in the order of SC4A < SC6A < SC8A and show dependence on the size of the cavities of the calixarenes. The fluorescence is selectively regenerated by adding acetylcholine. Based on this observation, a method to determine acetylcholine in a real neutral aqueous medium was developed.