Aromatic ion

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DRAFT DEFINITION
Aromatic ion

A planar cyclic ion that obeys the the Hückel (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. For current IUPAC recommended mass spectrometry terms, see the Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.