Biphenyl-3-carboxylic Acid at 296 and 203K

In biphenyl-3-carboxylic acid, C₁₃H₁₀O₂, hydrogen bonding is of the cyclic dimer type about a center of symmetry. The carboxyl H atom is ordered. The dihedral angle between the planar phenyl rings is 31.78 (8)° at 296 K and 31.27 (6)° at 203 K. The data show that the larger than average magnitudes of the displacement parameters of the carboxylic O atoms are due to thermal motion rather than static disorder.

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