This analysis demonstrates how dispersion attractions influence hydrogen atom proximity, revealing potential bonding implications.
The effects of loading up lots of dispersion attractions (between t-butyl groups) into a compact molecule has the interesting consequence of allowing two "non-bonded" hydrogen atoms to approach to ~1.5Å of each other, thus creating the appearance of a "bond" where one normally would not be found.
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Henry S. Rzepa (2017) studied this question.
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