Crown ethers at the aqueous solution-air interface. Part 2. Electrolyte effects, ethylene oxide hydration and temperature behaviour |
| |
Authors: | Niga Petru Johnson C Magnus Frey Jeremy G Rutland Mark W |
| |
Institution: | School of Chemical Science and Engineering, Royal Institute of Technology, Stockholm, 100 44, Sweden. |
| |
Abstract: | Vibrational Sum Frequency Spectroscopy (VSFS) was employed to study adsorbing films of 4-Nitro Benzo-15-Crown-5 (NB15C5) and Benzo-15-Crown-5 (B15C5) at the aqueous solution-air interface. The surface of the solution is strongly influenced by the presence of crown ether species. Changes in the orientation of NB15C5 were monitored as a function of solution concentration, by targeting the ratio of peak intensities of the CN and NO(2) vibrational modes. The water of hydration has also been probed as a function of crown concentration, salt concentration, and temperature. The latter study strongly suggests that the surface can be treated as a charged interface, and that the associated ordered water decreases with increasing ionic strength of the bulk solution. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|