Anna Marinopoulou, Vasiliki Christopoulou, Olga Karabinaki, Dimitris Christofilos, John Arvanitidis
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The high-pressure response of trans-cinnamic acid crystals studied by Raman spectroscopy
The pressure response of crystalline trans-cinnamic acid is studied by means of Raman spectroscopy up to 6 GPa. Pressure application causes the reversible shift of all the observed Raman peaks to higher frequencies and changes in their relative intensities, with the intermolecular vibrational modes being by far more sensitive to pressurization compared to the intramolecular ones. The present high-pressure Raman data indicate the structural stability of the trans-cinnamic acid crystal and molecular conformation up to the highest pressure attained in the experiments, the importance of the hydrogen bonding, as well as the considerable strengthening of the intermolecular interactions at elevated pressures.
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