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In chemistry, π-effects or π-interactions are a type of non-covalent interaction that involves π systems. Just like in an electrostatic interaction where a region of negative charge interacts with a positive charge, the electron-rich π system can interact with a metal (cationic or neutral), an anion, another molecule and even another π system.〔Anslyn, E.V.; Dougherty, D.A. (Modern Physical Organic Chemistry ); University Science Books; Sausalito, CA, 2005 ISBN 1-891389-31-9〕 Non-covalent interactions involving π systems are pivotal to biological events such as protein-ligand recognition. ==Types== The most common types of π-interactions involve: *Metal-π Interactions: involves interaction of a metal and the face of a π system, the metal can be a cation (known as cation-π interactions) or neutral *Polar-π interactions: involves interaction of a polar molecule and quadrupole moment a π system. *Aromatic-aromatic interactions (π stacking): involves interactions of aromatic molecules with each other. * *Arene-perfluoroarene interaction: electron-rich benzene ring interacts with electron poor hexafluorobenzene. *π donor-acceptor interactions: interaction between low energy empty orbital (acceptor) and a high energy filled orbital (donor). *Anion-π interactions: interaction of anion with π system *Cation-π interactions: interaction of a cation with a π system *C-H-π interactions: interaction of C-H with π system: These interactions are well studied using experimental as well as computational techniques. . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pi interaction」の詳細全文を読む スポンサード リンク
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