Order–disorder phase transition coupled with torsion in tri-n-butylammonium trichloroacetate (TBAT)

摘要: A novel molecular phase transition compound, tri-n-butylammonium trichloroacetate (TBAT), has been successfully synthesized with a reversible at 196 K. Its behaviour was confirmed by specific heat capacity and differential scanning calorimetry (DSC) measurements 2 K thermal hysteresis, indicating that the is first-order one. Dielectric further reveal nature of transition, which exhibits distinctive step-like anomalies between low high dielectric states. Moreover, temperature dependent single-crystal X-ray diffraction analyses TBAT disclose order–disorder transformation flexible cations haloacetic acids anion together torsion in stimulate structural transition. All these results open new way to design assemble materials.