7092
Solid - state ( 13 ) C magic - angle spinning ( MAS ) NMR spectroscopy is used to investigate the structure of the Cu ( II ) - based metal - organic frameworks ( MOFs ) , HKUST - 1 and STAM - 1 , and the structural changes occurring within these MOFs upon activation ( dehydration ) .
 Chemical: ( 13 ) C; Chemical: Cu ( II )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: ( 13 ) C; Chemical: Cu ( II )