Keywords
cocrystals
ferrocene
ferrocenyl
halogen bonding
hydrogen bonding
intermolecular interactions
polyiodide
supramolecular
ternary crystals
Abstract
In the cocrystalline salts [(Me5C5)2Fe]+I3−/(4-XC6H4OH) (X = Cl, I) the directionality of \( \mathrm{X \cdots I\text{-}I_2} \) halogen bonds is a significant packing factor notwithstanding their relatively low energies (∼10 kcal mol−1), as compared to the fivefold stronger ionic bonding between [(Me5C5)2Fe+] and [I3]− (∼50 kcal mol−1). This adds significant details to the structural landscape of [(Me5C5)2Fe+]I3 and offers an illustrative example of the stronger structure-defining effect of halogen bonding over the hydrogen one.
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