| 氯化癸铵的低频拉曼光谱研究 |
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| 引用本文： | 王玮,李来明,席时权.氯化癸铵的低频拉曼光谱研究[J].物理化学学报,1992,8(1):18-21. |
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| 作者姓名： | 王玮 李来明 席时权 |
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| 作者单位： | Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022 |
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| 摘 要： | 在290—340 K的温度范围内考察了氯化癸铵的低频拉曼光谱, 指认了210 cm~(-1)附近的谱带为分子烷基链的纵向声子振动带, 低于100 cm~(-1)的谱带为晶格振动带, 结果表明DeAC晶体存在313 K和321 K两个结构相变。在313 K以下的低温相, DeAC分子以完全有序的全反式链构象存在, 在313—321 K的中间相, 分子烷基链出现了旁式构象, 高温相与中间相相比主要是分子链横向堆积有序度明显降低, 而分子链构象特征无明显差异。
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| 关 键 词： | 氯化癸铵 低频拉曼光谱 纵向声子振动 分子构象 结构相变 |
| 收稿时间： | 1990-03-26 |
| 修稿时间： | 1990-09-25 |
STUDY ON LOW-FREQUENCY RAMAN SPECTRA OF n-DECYLAMMONIUM CHLORIDE |
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| Wang Wei,Li Laiming,Xi Shiquan Changchun Institute of Applied Chemistry,Academia Sinica,Changchun.STUDY ON LOW-FREQUENCY RAMAN SPECTRA OF n-DECYLAMMONIUM CHLORIDE[J].Acta Physico-Chimica Sinica,1992,8(1):18-21. |
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| Authors: | Wang Wei Li Laiming Xi Shiquan Changchun Institute of Applied Chemistry Academia Sinica Changchun |
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| Institution: | Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022 |
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| Abstract: | The low-frequency Raman spectrum of n-decylammonium chloride was measuredas a function of temperature in the temperature range from 290 to 340K, and thelongitudinal acoustical mode vibration band was assigned. The results showed thatthere are two phase transitions at 313K and 321K, respectively. The phase transitionat 313K is mainly induced by change of hydrocarbon chain conformations, while thatat 321K is mainly induced by change of order degree of molecular packing. Theresults suggest low-frequency Raman spectroscopy is a useful probe of structuralphase transition for long-chain compounds. |
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| Keywords: | n-Decylammonium chloride Low-frequency Raman spectroscopy longitudinal acoustical mode Molecular conformation structural phase transition |
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