Effect of pressure on the conformation of <i>p</i>-terphenyl in carbon disulfide

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<jats:p>The effect of pressure on the conformation of p-terphenyl in carbon disulfide has been measured by using high pressure infrared spectroscopy with a diamond anvil cell up to 7.1 kbar. Pressure effects on the nonplanar vibrational modes indicate that p-terphenyl molecule in the solution gets more planar when compressed. The intensities at atmospheric pressure indicate that the conformation in the solution is predominantly in D2 symmetry. Assuming that the two dihedral angles between the adjacent phenyl rings are equal to each other at all pressures, we estimate the rate of decrease of the dihedral angles by compression to be 2° kbar−1, which is equal to that of biphenyl in previous work.</jats:p>

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