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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 .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None