Spectroscopic Observation of Critical Guest Concentration Appearing in tert-Butyl Alcohol Clathrate Hydrate

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• 作者：Youngjune Park ; Minjun Cha ; Woongchul Shin ; Huen Lee ; John A. Ripmeester
• 刊名：Journal of Physical Chemistry B
• 出版年：2008
• 出版时间：July 24, 2008
• 年：2008
• 卷：112
• 期：29
• 页码：8443-8446
• 全文大小：225K
• 年卷期：v.112,no.29(July 24, 2008)
• ISSN：1520-5207

文摘

The tert-butyl alcohol (TBA) is the most hydrophobic of the simple alcohol and by itself does not form a clathrate hydrate with water. A genuine clathrate hydrate is synthesized by exposing a gaseous guest to solid TBA + H₂O powders. Here, we examine three consecutive spectroscopic approaches of (1) the occurrence of a “free” OH stretching band (ν(OH)) signal of TBA molecules representing an absence of hydrogen bonding between the host water and guest TBA, (2) a tuning effect for creating fresh cages via the rearrangement of the host−water lattice, and finally (3) the existence of a critical guest concentration (CGC) that appears only when the TBA concentration is dilute. The present findings from this simple three-step approach can be extended to other alcoholic guest species with the specific modifications to provide the new insights into inclusion chemistry.