Non-classical ion
From Mass Spec Terms
| DRAFT DEFINITION |
| Non-classical ion |
|---|
| A hyper-coordinated carbonium ion (see Onium Ion) such as the penta-coordinated norbornyl cation named non-classical by S. Winstein. The term derives from a cornerstone of the classical theory of structural chemistry since the time of Kekul???????????? in the 1860s that stated that carbon could bind at most four other atoms (tetra-coordination). Tri-coordinated carbenium ions (see Enium Ion) are consequently termed 'Classical Ions'. |
| Considered between 2004 and 2006 but not included in the 2006 PAC submission |
| This is an unofficial draft definition presented for information and comment. |
