Unexpectedly strong Xe binding by host–guest interaction
Literature Information
Yi Gao
A unique noncovalent interaction between XeO3 and 18-crown-6 has been studied by density functional theory. The calculated results show that there exists an extremely strong binding force between both species, reaching 36.44 kcal mol−1, which is comparable to the strong cation–π interaction. Detailed analyses on relaxed force constants, electrostatic potentials and the independent gradient model, etc. suggest that both quite strong aerogen bondings (Xe⋯O) and relatively weak unconventional H-bondings (C–H⋯O) coexist, and the complex is a typical heterodimer with multiple binding sites. Further studies found that XeO3 takes a quick rotary motion relative to 18-crown-6 in the complex due to low rotary barrier. Another two guest molecules, KrO3 and ArO3, are also discussed.
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