"NIE" doesn't have a common, recognized meaning in chemistry. It's possible you've encountered an abbreviation that isn't widely used or that is specific to a particular field or research group.

To help me understand what you're looking for, could you please provide more context? For example:

* Where did you see "NIE" used? (In a textbook, article, lab report, etc.)

* What was the surrounding information? (The topic being discussed, the chemical formulas involved, etc.)

With more context, I can help you figure out what "NIE" might mean in this specific case.