4.6 Article

Effect of Guest-Host Hydrogen Bonding on Thermodynamic Stability of Clathrate Hydrates: Diazine Isomers

期刊

JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 19, 页码 10218-10226

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b01101

关键词

-

资金

  1. Ministry of Trade, Industry & Energy (MOTIE) through Recovery of Natural Gas Hydrate in Deep-Sea Sediments Using Carbon Dioxide and Nitrogen Injection project [KIGAM-Gas Hydrate RD Organization]
  2. Midcareer Researcher Program through National Research Foundation Korea (NRF) grant - Ministry of Science, ICT and Future Planning (MSIP) [NRF-2014-049237]
  3. POSTECH

向作者/读者索取更多资源

Guest-host hydrogen bonding strongly affects the physical properties of clathrate hydrate, such as the thermodynamic stability, water dynamics, and dielectric properties, but attempts to quantify the effects of hydrogen bonding on these properties are rare thus far. As a preliminary work, this study investigates methane clathrate hydrates with three diazine isomers, pyrazine, pyrimidine, and pyridazine, which expect nearly the same van der Waals volumes due to their similar molecular shapes and sizes, and their guest-host hydrogen-bonding behaviors. The crystal structures of all three binary diazine + CH4 hydrate phases were identified as a cubic Fd (3) over barm structure, including diazine molecules in the 5(12)6(4) cavity, commonly termed as structure II hydrate, by a high-resolution powder diffraction pattern analysis. The phase equilibrium curves of their clathrate hydrates were obtained by the P-T trajectory of the hydrate formation and dissociation process, and the thermodynamic stability trend was well-explained by the guest-host hydrogen bonding behavior as evaluated by the molecular polarities, proton affinities, and ring-breathing vibration frequencies of the three diazine isomers obtained from Raman spectroscopy. This study provides useful information that contributes to the realization of the expansion of the thermodynamics of clathrate hydrates to include guest-host hydrogen-bonding interactions.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据