Structure of the Lowest Temperature Phase of the Solid Benzene–Hexafluorobenzene Adduct

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Similarities with a number of liquid-crystal systems are revealed by the structural characterization of the low-temperature phases II-IV of the solid adduct from benzene and hexafluorobenzene (right). As the temperature is raised, increased rotation leads to a reduction in the interactions between neighboring columns of alternating C6H6 and C6F6 molecules. These results could only be obtained by using a combination of powder diffraction techniques with neutrons and synchrotron radiation.