7988
The association constants for the formation of anion - pi complexes in acetonitrile are in the range of 239 to 16950 M ( - 1 ) , following the order of 1 . NO ( 3 ) ( - ) > 1 . BF ( 4 ) ( - ) > 1 . PF ( 6 ) ( - ) > 1 . SCN ( - ) .
 Chemical: acetonitrile; Chemical: NO ( 3 ) ( - ); Chemical: BF ( 4 ) ( - ); Chemical: PF ( 6 ) ( - ); Chemical: SCN ( - )
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: acetonitrile; Chemical: NO ( 3 ) ( - ); Chemical: BF ( 4 ) ( - ); Chemical: PF ( 6 ) ( - ); Chemical: SCN ( - )