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| Content Provider | Springer Nature Link |
|---|---|
| Author | Wu, Dan Guo, Yuan Liu, GuangMing Zhang, GuangZhao |
| Copyright Year | 2012 |
| Abstract | The effect of pH on the conformation of surface alkyl groups and the structure of interfacial water molecules on poly[2-(dimethylamino)ethyl methacrylate] (PDEM) at the air/water interface were investigated with sum frequency generation vibrational spectroscopy (SFG-VS). At pH 4.1, the hydrogen bonding SFG spectra were similar to that of the air/pure water interface. As the pH increased from 5.4 to 9.6, the SFG intensities of both highly ordered hydrogen bonding (3200 cm$^{−1}$ band) and less-ordered hydrogen bonding (3400 cm$^{−1}$ band) were enhanced because of the charge-induced effect of deprotonated PDEM. The free OH peak disappeared completely because it was replaced by interfacial PDEM molecules. At pH 11.5, a new spectral band appeared at about 3580 cm$^{−1}$ in the ppp and sps spectra, and this could be assigned to the C $_{2v}$ asymmetric stretching mode of the water molecules through molecular symmetry simulation. These hydrogen bonding structures are fully consistent with the conformational change of PDEM alkyl groups, and PDEM molecules act as a Hofmeister solvent. PDEM molecules are kosmotropic when they are charged and become more chaotropic as the pH increases. |
| Starting Page | 984 |
| Ending Page | 991 |
| Page Count | 8 |
| File Format | |
| ISSN | 10016538 |
| Journal | Chinese Science Bulletin |
| Volume Number | 57 |
| Issue Number | 9 |
| e-ISSN | 18619541 |
| Language | English |
| Publisher | SP Science China Press |
| Publisher Date | 2012-02-04 |
| Publisher Place | Heidelberg |
| Access Restriction | Subscribed |
| Subject Keyword | pH hydrogen bonding PDEM interface SFG-VS Earth Sciences Life Sciences Chemistry/Food Science Science Engineering Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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