Symmetry Breaking and Switchable Thermal Dielectric Behaviors Triggered by Order-Disorder Phase Transition in a Neutral Co-crystallized Organic Adduct
Publication date: Available online 8 November 2018
Source: Chemical Physics Letters
Author(s): Shao-Peng Chen, Chang-Feng Wang, Hai-Tao Zhou, Yu-Hui Tan, He-Rui Wen, Yun-Zhi Tang
Reversible crystal state structural phase transitions molecular materials without metal have been received increasing interest recently. Here we successfully synthesized a novel ternary neutral co-crystallized organic adduct hexamethylenetetramine·1-adamantane carboxylic acid·chloroform, 1, which accompanies with an interesting reversible phase transition close to the zero temperature (263 K). We confirmed this reversible phase transition by its switchable thermal dielectric behaviors and unit cell constants anomalies around the phase transition temperature (Tc). X-ray single crystal diffraction analysis above (1-RTP) and below (1-LTP) Tc suggests that the order-disorder motion from the adamantane ring in 1-adamantane carboxylic acid triggered the reversible phase transition.