Reversible Transition between Discrete and 1D Infinite Architectures: A Temperature-Responsive Cu(I) Complex with a Flexible Disilane-Bridged Bis(Pyridine) Ligand
Zhao, Yongjin, Toyotaka Nakae, Satoshi Takeya, Mineyuki Hattori, Daisuke Saito, Masako Kato, Yoshinori Ohmasa, Shun Sato, Osamu Yamamuro, Tomasz Galica, Eiji Nishibori, Shiori Kobayashi, Tomohiro Seki, Teppei Yamada, and Yoshinori Yamanoi
Chemistry – A European Journal
Thermoresponsive molecular structure based on a disilane-bridged bis(pyridine) ligand and CuI is reported. Single-crystal X-ray analysis revealed that there are two polymorphs in the Cu(I) complex: octanuclear copper(I) complex at 20 °C and 1D staircase copper(I) polymer complex at −196 °C. The formation of these polymorphs is due to the flexibility of ligand. Cu‒I bond formation is observed upon cooling the sample from ‒10 °C to ‒170 °C. The temperature-induced phase transition progression was clarified by DSC, VT-PXRD, and VT-photoluminescence measurements and indicated a reversible temperature-controlled crystal-to-crystal phase transition. Observation on a VT-stage using a high-speed camera showed crystal cracking during single-crystal to single-crystal transitions between these polymorphic forms.