Autor: |
Zhuravlev, K. K., McCluskey, M. D. |
Předmět: |
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Zdroj: |
Journal of Chemical Physics; 8/22/2002, Vol. 117 Issue 8, p3748, 5p, 1 Diagram, 2 Charts, 5 Graphs |
Abstrakt: |
Changes in the conformations of conjugated molecules affect the optical and electronic properties significantly. Hydrostatic pressure has been used to probe the conformations of biphenyl (C[sub 12]H[sub 10]) and deuterated biphenyl (C[sub 12]D[sub 10]) at liquid-helium temperatures. Infrared (IR) spectra of these materials have been taken up to a pressure of 2 GPa. A disappearance of certain IR absorption peaks has been found to occur between 0.07 and 0.45 GPa, due to the phase transition from a twisted to a planar conformation. Numerical simulations together with group-theoretical analysis have been performed to identify the nature of the vibrational modes that lose IR activity upon planarization. [ABSTRACT FROM AUTHOR] |
Databáze: |
Complementary Index |
Externí odkaz: |
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