3569
Preorganization of polypyridyl ligands ranging from bidentate to tetradentate by bridging benzo groups , as are present in 1 , 10 - phenanthroline ( phen ) compared to 2 , 2 ' - bipyridyl ( bpy ) , is discussed .
 Chemical: polypyridyl; Chemical: benzo; Chemical: 1 , 10 - phenanthroline; Chemical: phen; Chemical: 2 , 2 ' - bipyridyl; Chemical: bpy
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: polypyridyl; Chemical: benzo; Chemical: 1 , 10 - phenanthroline; Chemical: phen; Chemical: 2 , 2 ' - bipyridyl; Chemical: bpy