7956
' 2 + 1 + 1 ' - type complexes include a N , N - bidentate chelate and two monodentate phosphines ( 1 - 8 ) and ' 3 + 1 ' - type complexes comprise a N , N , O - or N , N , N - tridentate chelate and one monodentate phosphine ( 9 - 12 ) .
 Chemical: N; Chemical: N; Chemical: phosphines; Chemical: N; Chemical: N; Chemical: O; Chemical: N; Chemical: N; Chemical: N; Chemical: phosphine
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: N; Chemical: N; Chemical: phosphines; Chemical: N; Chemical: N; Chemical: O; Chemical: N; Chemical: N; Chemical: N; Chemical: phosphine