Question

Why isn't there a compound with the formula FeI3 (ferric iodide)?

Answer 1

This is news to me, of course, `FeI_3` is usually unstable with respect to reduction.

Explanation:

This article is behind a pay wall. If you are at a university, it will be available from the library. Of course, I do NOT suggest that you buy the article.

Answer 2

The reaction between ferric and iodide ions is documented in the form of a laboratory experiment here:

http://ceac.atilim.edu.tr/shares/chem/files/LAB/che%C3%B6106/CHEM%20106_EXP%204.pdf