Aromatic ion: Difference between revisions

Revision as of 01:30, 25 December 2005

Aromatic ion
DRAFT DEFINITION
A planar cyclic ion that obeys the the H?????????????ckel (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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-{{DefName|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 &#61; 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 H?????????????ckel (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.
+}}
 [[Category:Ions]]