Polymorphism in cyclohexanol

The crystal structures of phase II and the metastable phases III' and III of cyclohexanol, C₆H₁₁OH, have been determined using high-resolution neutron powder and single-crystal X-ray diffraction techniques. Phase II crystallizes in a tetragonal structure, space group , characterized by a hydrogen-bonded tetrameric ring motif. Phases III' and III are monoclinic, space groups P2₁/c and Pc, respectively, with molecules linked via hydrogen-bonded chains.