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Temperature effects on the C–H symmetric stretching vibrational frequencies of guest hydrocarbon molecules in 512, 51262 and 51264 cages of sI and sII clathrate hydrates

机译:Si和Sii Clathrate水合物512,51262和51264笼中的客气烃分子的C-H对称拉伸振动频率的温度效应

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C–H symmetric stretching vibrational frequencies of CH _(4) , C _(2) H _(4) and C _(2) H _(6) molecules encapsulated in 5 ~(12) , 5 ~(12) 6 ~(2) and 5 ~(12) 6 ~(4) cages of structures I (sI) and II (sII) clathrate hydrates measured by Raman spectroscopy in the temperature range of 93–183 K was analysed. The slopes of the symmetric stretch vibrational frequencies under changing temperatures (Δ v /Δ T ) for CH _(4) , C _(2) H _(4) and C _(2) H _(6) molecules encapsulated in sII 5 ~(12) 6 ~(4) cages were smaller than those for molecules in sI 5 ~(12) 6 ~(2) cages, although sI 5 ~(12) 6 ~(2) cages are smaller than sII 5 ~(12) 6 ~(4) cages. We compared the results of Δ v /Δ T in this study with the geometrical properties of each host water cage, and these comparisons suggest that the geometry of host water cages affects Δ v /Δ T .
机译:C-H对称拉伸振动频率的CH _(4),C _(2)H _(4)和C _(2)H _(6)分子在5〜(12),5〜(12)6中封装〜(2)和5〜(12)6〜(4)笼的结构I(Si)和II(SiI)通过拉曼光谱法测量的II(SiI)克拉静水合物在93-183k的温度范围内测定。对称拉伸振动频率的倾斜度在改变温度(ΔV/δt)的CH _(4),C _(2)H _(4)和C _(2)H _(6)分子中封装在SII中的分子5〜(12)6〜(4)笼小于Si 5〜(12)6〜(2)笼中的分子,虽然Si 5〜(12)6〜(2)笼小于SII 5〜 (12)6〜(4)个笼子。我们将该研究中的ΔV/δt的结果与每个主体水笼的几何特性进行了比较,并且这些比较表明主体水笼的几何形状会影响ΔV/ΔT。

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