This analysis reveals octet-expansion in hypervalent compounds, indicating new insights into single bond structure.
Previously: "Non-polar" species such as SeMe ₆ , SMe ₆ , ClMe ₃ , ClMe ₅ all revealed interesting properties for the Se-C, S-C or Cl-C "single" bonds. The latter two examples in particular hinted at internal structures for these single bonds, as manifested by two ELF basins for some of the bonds.
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Henry S. Rzepa (2017) studied this question.
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