Aromatic ion: Difference between revisions

Latest revision as of 18:50, 15 March 2021

Aromatic ion
DRAFT DEFINITION
A planar cyclic ion that obeys the the Huckel (4n + 2) rule where n is a positive integer representing the number of conjugated π electrons. Charge delocalization leads to greater stability compared to a hypothetical localized structure.
Considered between 2004 and 2006 but not included in the 2006 PAC submission
This is an unofficial draft definition presented for information and comment. Recommended terms \| Full list of terms

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-A cyclically conjugated ion with a stability (due to delocalization) significantly greater than that of a hypothetical localized structure (e.g. Kekul???????????? structure). If the structure is of higher energy than such a hypothetical classical structure, the ion is antiaromatic. Aromatic ions obey the H?????????????ckel (4n + 2) rule: monocyclic planar (or almost planar) systems of trigonally (or sometimes digonally) hybridized atoms that contain (4n + 2) p-electrons (where n is a non-negative integer generally limited to n = 0??????????????????????????5). Ions containing 4n p-electrons are antiaromatic. Examples of aromatic ions are the cyclopropenyl cation and the cyclopentadienyl anion whereas the cyclopentadienyl cation is antiaromatic.
+{{DefName|
+A planar cyclic [[ion]] that obeys the the Huckel (4n + 2) rule where n is a positive integer representing the number of conjugated &pi; electrons. Charge delocalization leads to greater stability compared to a hypothetical localized structure.
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 [[Category:Ions]]
+{{DEFAULTSORT:Aromatic Ion}}