A Reversible Single-Crystal to Single-Crystal Thermal Phase Transformation of 3-(2-Bromo-4-(1-methylethyl)phenyl)-1,1-dimethyl urea

作者：Kariuki Benson M^*; El Hiti Gamal A^*

来源：Crystals, 2017, 7(3): 75.

DOI：10.3390/cryst7030075

• crystal-to-crystal
• 1,1-dimethylurea
• reversible
• phase transition
• thermal

3-(2-Bromo-4-(1-methylethyl)phenyl)-1,1-dimethylurea was synthesized and structurally characterized at 296 K, 200 K and 140 K. A reversible thermal phase transformation was observed at -170-180 K. On cooling, the structure transforms from a monoclinic to a triclinic crystal system. The isopropyl group is disordered above the phase transition temperature but is ordered below the transition temperature.