Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 29, Pages 16028-16034Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp504390u
Keywords
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Funding
- National Science Foundation of China [21090354, 21274135, 21174137]
- Doctoral Fund of Ministry of Education of China [20133402110042]
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The high-pressure structural properties of PCP were investigated by using Raman scattering techniques in a diamond anvil cell up to 10 GPa at room temperature. Compression caused a relative flat xylyl fragment and twisted ethylene bridges in PCP. Raman analysis showed that more peaks related to vibrational modes of aliphatic CH2 emerged due to the transition to a low symmetric phase after compression pressure reached 3.9 GPa. Other blue-shifting peaks showed discontinuity in the frequency pressure curves at pressure 3.9 GPa because of molecular relaxation by phase transition. Compression strengthened the conjugation of xylyl fragments. When releasing pressure, the normal vibrational modes could be recovered with a hysteresis of similar to 1.3 GPa. The normal phase of PCP could be fully recovered under ambient conditions.
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