11829
Spectroelectrochemical studies on the ' dimers of dimers ' show no evidence of intervalence charge transfer bands in the mixed valence radical cations formed by one - electron oxidation , indicating that they are examples of proton - coupled mixed valency .
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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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