No, not in general. Explaining stuff is a skill, and if you have it, the IQ gap is not a problem. And if you don't have it, then you'll have problems explaining to someone even with the same IQ but in the different industry.
If you had a conversation, and both parties went away frustrated, and you think it's because their IQ it too low.. think again. Surely as a person with high IQ you can find the right level of explanation?
There are plenty of examples: professors explaining to students, researchers talking to journalists, and even parents teaching their children.