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Cation–π interactions are noncovalent interactions between a positively charged ion (cation) and the electron-rich π system of an aromatic ring. In supramolecular chemistry, these interactions play a crucial role in molecular recognition, self-assembly, and host–guest chemistry. The π electrons in aromatic systems such as benzene, naphthalene, or substituted arenes create a region of negative electrostatic potential above and below the plane of ______ _______ ______ ______ __________ _______ ___ _________ ___ _________ __________ _______.
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