13089
Specifically , they can be described as interactions between the metal center ( active site ) and the surface functionality of the support , and they have been detected by surface - enhanced ( 1 ) H - ( 29 ) Si NMR spectroscopy of the ligand and ( 31 ) P solid - state NMR of the catalyst precursor .
 Chemical: ( 1 ) H; Chemical: ( 29 ) Si; Chemical: ( 31 ) P
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: ( 1 ) H; Chemical: ( 29 ) Si; Chemical: ( 31 ) P