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Multi-stimuli-responsive induced chirality of polyoxometalates in natural polysaccharide hydrogels
Rong Wang1, Xinhua Wan, Jie Zhang
1Beijing National Laboratory for Molecular Science, Key Laboratory of Polymer Chemistry and Physics of Minister of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. xhwan@pku.edu.cn jz10@pku.edu.cn.
Abstract:
Induced circular dichroism (ICD) of polyoxomolybdates and polyoxotungstates was realized in three kinds of natural polysaccharide hydrogels possessing hierarchical chirality. Interestingly, the extrinsic chiral factors were dominant in ionic κ/ι-carrageenan hybrids, while the ICD of clusters was dominantly influenced by the intrinsic alternating bond length (ABL) distortions of polyoxometalates in agarose hybrid. The optical activity of the POMs shows sensitive response to multiple stimuli, such as temperature, K+ salts, UV irradiation and redox agents.
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