- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Hidden Isolated OH at the Charged Hydrophobic Interface Revealed by Two-Dimensional Heterodyne-Detected VSFG Spectroscopy
摘要： Water around hydrophobic groups mediates hydrophobic interactions that play key roles in many chemical and biological processes. Thus, the molecular-level elucidation of the properties of water in the vicinity of hydrophobic groups is important. We report on the structure and dynamics of water at two oppositely charged hydrophobic ion/water interfaces, the tetraphenylborate-ion (TPB?)/water and tetraphenylarsonium-ion (TPA+)/water interfaces, which are clarified by two-dimensional heterodyne-detected vibrational sum-frequency generation (2D HD-VSFG) spectroscopy. The obtained 2D HD-VSFG spectra of the anionic TPB? interface reveal the existence of distinct π-hydrogen bonded OH groups in addition to the usual hydrogen-bonded OH groups, which are hidden in the steady-state spectrum. In contrast, 2D HD-VSFG spectra of the cationic TPA+ interface only show the presence of usual hydrogen-bonded OH groups. The present study demonstrates that the sign of the interfacial charge governs the structure and dynamics of water molecules that face the hydrophobic region.
关键词： hydrophobic interfaces,sum-frequency generation,ultrafast spectroscopy,interfacial water,vibrational dynamics
更新于2025-09-23 15:21:01
-
Hidden isolated OH at the charged hydrophobic interface revealed by two-dimensional heterodyne-detected VSFG spectroscopy
摘要： Water around the hydrophobic groups mediates hydrophobic interaction that plays key roles in many chemical and biological processes. Thus, molecular-level elucidation of the properties of the water in the vicinity of the hydrophobic group is important. We report on the structure and dynamics of water at two oppositely charged hydrophobic interfaces, i.e., the tetraphenylborate ion (TPB-)/water and tetraphenylarsonium ion (TPA+)/water interfaces, which are clarified by two-dimensional heterodyne-detected vibrational sum frequency generation (2D HD-VSFG) spectroscopy. The obtained 2D HD-VSFG spectra of anionic TPB- interface reveal the existence of distinct π-hydrogen bonded OH groups in addition to the usual hydrogen bonded OH groups, which is hidden in the steady-state spectrum. In contrast, 2D HD-VSFG spectra of cationic TPA+ interface only show the presence of usual hydrogen bonded OH groups. The present study demonstrates that the sign of the interfacial charge governs the structure and dynamics of water molecules that face the hydrophobic region.
关键词： sum-frequency generation,ultrafast spectroscopy,hydrophobic interfaces,interfacial water,vibrational dynamics
更新于2025-09-23 15:19:57