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The title compound, C9H12NO3F3S, was synthesized and characterized by elemental analyses, IR spectroscopy, thermogravimetric analysis and single crystal X-ray diffraction. The crystals are monoclinic, space group P21/c, Z = 4, The structure is stabilized by N–H···O and C–H···F hydrogen-bonds forming a three-dimensional network. [ABSTRACT FROM AUTHOR]

Guanidine dichloroacetate was synthesized and separated as crystals. Differential scanning calorimetry (DSC) measurement shows that this compound undergoes a reversible phase transition at about 275 K with a heat hysteresis of 28 K. Step-like dielectric anomaly observed at 274 K further confirms the phase transition. The single-crystal X-ray diffraction data suggested that these was a transition from a room-temperature phase with the space group of P21/n (a = 8.030(5), b = 12.014(9), c = 8.124(6) Å, β = 96.089(1)°, V = 779.3(1) Å3, and Z = 4) to a low-temperature one with the space group of P21/c (a = 7.941(2), b = 11.828(3), c = 10.614(2) Å, β = 130.985(1)°, V = 752.6(3) Å3, and Z = 4). The displacements of hydrogen bonds induce the structure phase transition. [ABSTRACT FROM AUTHOR]