High-Pressure Raman Study of Pyromellitic Dianhydride
CONG Guang-yu1, LI Dong-fei2*, LIU Jia-rui3
1. Department of Basic Education of Changchun Guanghua University, Changchun 130033，China
2. College of Physics, Changchun Normal University, Changchun 130032，China
3. College of Physics, Jilin Normal University, Siping 136000，China
Abstract：Raman spectra of pyromellitic dianhydride crystal have been measured from ambient to 24 GPa, and the Raman vibrational modes of pyromellitic dianhydride have been assigned. Based on the pressure dependence of Raman mode frequencies, it can be observed that a phase transition of pyromellitic dianhydride occurred from Phase Ⅰ to Phase Ⅱ at 2 GPa. In comparing the slopes of the pressure dependence of the Raman vibrational modes between Phase Ⅰ and Phase Ⅱ, it can be found that most of the slopes of Phase Ⅰ were smaller than Phase Ⅱ. The results indicate that the sensitivity of functional groups of pyromellitic dianhydride to pressure decreases with increasing pressure, and the molecular crystal of pyromellitic dianhydride has a more compact stacking structure in phaseⅡ. Besides, we also calculated the Raman intensities ratio of the overtone of C—O stretching vibration mode (located at 1 837 cm-1) and the fundamental of C═O stretching vibration mode (located at 1 865 cm-1) and the discontinuities of the Raman intensities ratio versus pressure was observed. This behavior confirms that the pyromellitic dianhydride crystal has undergone a phase transition at 2 GPa, as mentioned above.
Key words：Raman spectroscopy; High pressure; Phase transformation; Pyromellitic dianhydride
丛广宇，李东飞，刘嘉睿. 高压拉曼光谱研究均苯四甲酸二酐[J]. 光谱学与光谱分析, 2024, 44(09): 2434-2438.
CONG Guang-yu, LI Dong-fei, LIU Jia-rui. High-Pressure Raman Study of Pyromellitic Dianhydride. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(09): 2434-2438.
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