Effect of pressure on the internal rotation angle of biphenyl in carbon disulfide

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Abstract
The effect of pressure on the conformation of biphenyl in carbon disulfide was measured by using high pressure infrared spectroscopy with a diamond anvil up to 13 kbar. Pressure effects on the nonplanar vibrational modes indicate that the dihedral angle decreases at the rate of 2° kbar−1. Under high pressure the frequency of the C–H stretching vibrational modes shifts to blue so that the repulsive force becomes more predominant in the solute–solvent interactions between CH and CS2 molecule. The decrease in the dihedral angle of biphenyl induced by compression is related to the change of the intrinsic volume of the biphenyl molecule.