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These results illustrate that metal complexes , besides being able to impart rich optical , electronic , redox , or magnetic properties to supramolecular hydrogels , also offer a unique geometrical control to prearrange the self - assembly motif prior to self - assembling .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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