English edit

Etymology edit

cation +‎ π, π is from π system. Aromatic residues are called π systems because they contain a lot of π links, links between p electrons.

Noun edit

cation (uncountable)

  1. (organic chemistry, physical chemistry) A noncovalent interaction between a cation, a positive ion like Li⁺ or Na⁺, and an aromatic residue such as benzene, ethylene, acetylene.

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