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Molecular Spring-like Triple-Helix Coordination Polymers as Dual-Stress and Thermally Responsive Crystalline Metal–Organic Materials |
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| Authors: | Dr Lei Mei Dr Shu-wen An Dr Kong-qiu Hu Dr Lin Wang Dr Ji-pan Yu Zhi-wei Huang Xiang-he Kong Prof Chuan-qin Xia Prof Zhi-fang Chai Prof Wei-qun Shi |
| Institution: | 1. Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China;2. Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China
College of Chemistry, Sichuan University, Chengdu, 610064 China These authors contributed equally to this work.;3. Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo, 315201 China;4. College of Chemistry, Sichuan University, Chengdu, 610064 China |
| Abstract: | Elastic metal–organic materials (MOMs) capable of multiple stimuli-responsiveness based on dual-stress and thermally responsive triple-helix coordination polymers are presented. The strong metal-coordination linkage and the flexibility of organic linkers in these MOMs, rather than the 4 Å stacking interactions observed in organic crystals, causes the helical chain to act like a molecular spring and thus accounts for their macroscopic elasticity. The thermosalient effect of elastic MOMs is reported for the first time. Crystal structure analyses at different temperatures reveal that this thermoresponsiveness is achieved by adaptive regulation of the triple-helix chains by fine-tuning the opening angle of flexible V-shaped organic linkers and rotation of its lateral conjugated groups to resist possible expansion, thus demonstrating the vital role of adaptive reorganization of triple-helix metal–organic chains as a molecular spring-like motif in crystal jumping. |
| Keywords: | elastic flexing mechanical responsiveness metal–organic materials molecular springs thermosalient effect |