13530
The detailed kinetic studies have revealed that the rate - determining step in the catalytic cycle is the proton - coupled electron transfer reduction of O ( 2 ) with the protonated Co ( II ) ( Ch ) ( [ Co ( II ) ( ChH ) ] ( + ) ) that is produced by facile electron - transfer reduction of [ Co ( III ) ( ChH ) ] ( 2 + ) by ferrocene derivative in the presence of HClO ( 4 ) .
 Chemical: O ( 2 ); Chemical: Co ( II ) ( Ch ); Chemical: [ Co ( II ) ( ChH ) ] ( + ); Chemical: [ Co ( III ) ( ChH ) ] ( 2 + ); Chemical: ferrocene; Chemical: HClO ( 4 )
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: O ( 2 ); Chemical: Co ( II ) ( Ch ); Chemical: [ Co ( II ) ( ChH ) ] ( + ); Chemical: [ Co ( III ) ( ChH ) ] ( 2 + ); Chemical: ferrocene; Chemical: HClO ( 4 )