In this post, I looked at some hydrogen bonds formed by interaction of a π-system with an acidic hydrogen. Unlike normal lone pair donors, π-systems can involve more than two electrons, most commonly four or six. Here I look at examples of both these higher-order donors.
The NCI surface for this 4-electron hydrogen bonded interaction shows four interesting features:
WULSUS
To sum up, the NCI method (which has been used elsewhere in this blog) seems to be teasing out some interesting zones of intramolecular interaction in hydrogen bonded molecules. I end again with the same speculation; have any π-face hydrogen bonds that are > η-6 been discovered?
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