Affiliation:
1. Green Catalysis Centre College of Chemistry Zhengzhou University Henan 450001 China
2. Tianjin Institute for Food Safety Inspection Technology Tianjin 300308 China
3. School of Mathematics and Physics The University of Queensland Brisbane Queensland 4072 Australia
Abstract
AbstractAcid acts as a “fuel” in driving kinetic self‐assembly, with crystals of the CuII complex ([CuIICl2(BH)2], BH=benzothiadiazole helicene derivative) being successfully converted to crystals of 1 ([H2BH][CuBr3]) and 2 ([H2BH][CuBr3⋅2H2O]). The metastable features of 1 and 2 enable CuI guest release, with transformation into a thermodynamically favorable form 3 (H2BH⋅2Br). Compound 1 exhibits dual phosphorescence at 452 nm (3MC) and 709 nm (3CT) at room temperature. At lower temperatures, the 3CT band disappears and the 3MC band weakens, while a new emission band at 621 nm (3ππ*) is enhanced. In 1, the subtle structural change and significant emission change depending on temperature is reversible. In contrast, 2 exhibits only 3MC emission at room temperature, with less efficient triplet‐triplet energy transfer (TTET) below 250 K, and with residual 3ππ* emission occurring upon returning to room temperature, even after one week.
Funder
Australian Research Council