FT-IR and FT-Raman study of hydrogen bonding in p-alkylcalix[8]arenes |
| |
Institution: | 1. Kazan State Architect and Civil Engineering University, 1 Zelenaya Str., 420043 Kazan, Russia;2. A.E. Arbuzov Institute of Organic and Physical Chemistry, RAS, 8 Arbuzov Str., 420088 Kazan, Russia;3. Kazan Federal University, Kremlyovskaya Str., 420008 Kazan, Russia |
| |
Abstract: | The FTIR and FT Raman spectra of p-alkylcalix8]arenes (alkyl = tert-butyl, isononyl) were recorded. Analysis of IR spectra showed that the cyclic cooperative intramolecular hydrogen bond is realized in calix8]arene. It was found that the strength of the cyclic cooperative intramolecular hydrogen bond in the series of alkyl derivatives of calix8]arenes depends very little on the replacement of the p-tert-butyl groups by the more bulky isononyl group. From our data follows that the orientation of aromatic fragments in calixarene molecules depends on the type of alkyl substituent.An analysis of the changes in the IR spectra with heating and dissolution shows that the conformation of the “pleated-loop” is retained in p-tert-butylcalix8]arene. It turned out that the intramolecular hydrogen bond is a “probe” of the conformation of calixarene molecules and IR spectroscopy is a unique method that allows one to follow the slightest nuances of changes in the H-bound system of these supermolecules. |
| |
Keywords: | Calixarenes IR spectra Raman spectra Hydrogen bonding DFT |
本文献已被 ScienceDirect 等数据库收录! |
|