8318
The PF ( 6 ) ( - ) anion performs isotropic rotation in all three polymorphic crystals phases alpha , beta , and gamma as well as in the liquid state with a characteristic time scale that ranges from a few ps to a few hundred ps over a temperature range of 180 - 280 K .
 Chemical: PF ( 6 ) ( - )
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: PF ( 6 ) ( - )