PENTACENE AT HIGH PRESSURE
- 1 September 2003
- journal article
- Published by Taylor & Francis in High Pressure Research
- Vol. 23 (3) , 349-354
- https://doi.org/10.1080/0895795031000139145
Abstract
We report a high-pressure optical study of pentacene by Raman, absorption, and reflectance spectroscopy. Two modifications, denoted C and H, were used as starting material. Raman spectra indicate a sluggish phase transition of the polymorph C to the H-phase with a very low onset pressure of 0.2 GPa. The H-phase remains stable up to at least 11 GPa. The vibrational properties of the H phase in this pressure range were modeled by lattice dynamics calculations. The optical absorption edge of pentacene exhibits a initial red shift of about —80meV/GPa. At pressures near 10 GPa the ππ* reflection bands disappears gradually, indicating a loss of aromaticity due to the formation of saturated C—C bonds.Keywords
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