27470
Based on highly selective and irreversible Hg ( 2 + ) - promoted desulfurization reaction , a new and simple phenanthroimidazole - type sensor was prepared and exhibited high selectivity towards Hg ( 2 + ) ion over other metal ions , accompanied by transformation of a weakly fluorescent thioamide moiety ( colorless ) to a highly fluorescent amide one ( blue ) , with a 136 - fold increase in fluorescent intensity in aqueous solution with a pH span 2 . 57 - 9 . 12 .
 Chemical: Hg ( 2 + ); Chemical: phenanthroimidazole; Chemical: Hg ( 2 + ); Chemical: thioamide; Chemical: amide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Hg ( 2 + ); Chemical: phenanthroimidazole; Chemical: Hg ( 2 + ); Chemical: thioamide; Chemical: amide