An “anti-crown” sandwich: Symmetry-allowed interactions of the filled p orbitals of the iodide ion with the corresponding empty p orbitals of the mercury atoms of B-hexamethyl-9-mercuracarborand-3 result in three equivalent pHg-pI-pHg three-center, two-electron bonds (see picture) and a sandwich structure.
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Lee et al. (2000) studied this question.
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