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-π相互作用
Wikipedia definition
1. Cation–pi interactionCation–π interaction is a noncovalent molecular interaction between the face of an electron-rich π system and an adjacent cation (e.g. Li, Na). This interaction is an example of noncovalent bonding between a monopole (cation) and a quadrupole (π system). Bonding energies are significant, with solution-phase values falling within the same order of magnitude as hydrogen bonds and salt bridges.
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