Yeung Jenny Yuk-Wa, Kong Fred Ka-Wai, Hau Franky Ka-Wah, Chan Michael Ho-Yeung, Ng Maggie, Leung Ming-Yi, Yam Vivian Wing-Wah
Institute of Molecular Functional Materials, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
Angew Chem Int Ed Engl. 2022 Aug 26;61(35):e202207313. doi: 10.1002/anie.202207313. Epub 2022 Jul 18.
A series of platinum(II) calix[4]arene-based molecular tweezers was synthesized. The studies of the host-guest association with a charge-neutral cyclometalated platinum(II) complex showed a drastic color change and the turning on of near-infrared emission resulting from Pt⋅⋅⋅Pt and π-π interactions. Control of the host-guest assembly process by varying the solvent composition can lead to a change from discrete host and guest molecules to high-ordered host-guest oligomers with the formation of sheet-like nanostructures, demonstrating a rare example of three-state supramolecular host-guest system with high solubility in solvents of diverse polarity. The change in host-guest assembly behaviors could be probed by drastic color changes from yellow to orange to green. The present study provides insights into the systematic design of solvent-responsive molecular materials using molecular tweezers-directed host-guest assembly, with potential applications in colorimetric sensing of changes in the micro-environment.
合成了一系列基于杯[4]芳烃的铂（II）分子镊子。对与电荷中性环金属化铂（II）配合物的主客体缔合研究表明，由于Pt⋅⋅⋅Pt和π-π相互作用，出现了剧烈的颜色变化并开启了近红外发射。通过改变溶剂组成来控制主客体组装过程，可导致从离散的主体和客体分子转变为具有片状纳米结构形成的高阶主客体低聚物，这展示了在多种极性溶剂中具有高溶解度的三态超分子主客体体系的罕见实例。主客体组装行为的变化可通过从黄色到橙色再到绿色的剧烈颜色变化来探测。本研究为使用分子镊子导向的主客体组装进行溶剂响应性分子材料的系统设计提供了见解，在微环境变化的比色传感中具有潜在应用。
