I apologize for the confusion, but currently, there is no chemical substance with the formula ClF9. The compounds of chlorine and fluorine with the general formula ClFn only exist with n ranging from 1 to 7. Among them, Flostine (ClF3), Flostine hexafluoride (ClF6), and Flostine heptafluoride (ClF7) are the most common compounds. These compounds all have strong oxidizing properties, are very toxic, and are difficult to handle.
You may have meant to refer to substance ClF3 or ClF5, so please make sure that you have provided accurate information. If you have any questions or concerns about any other chemical substances, let me know. I would be more than happy to assist!