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Electron‐counting rules, three‐dimensional aromaticity, and the boundaries of the Periodic Table
Author(s) -
Shainyan Bagrat A.
Publication year - 2011
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.1830
Subject(s) - aromaticity , electron counting , periodic table , planar , space (punctuation) , electron , chemistry , extension (predicate logic) , table (database) , period (music) , theoretical physics , molecule , pure mathematics , crystallography , physics , quantum mechanics , mathematics , computer science , organic chemistry , data mining , acoustics , programming language , computer graphics (images) , operating system
To describe aromaticity of planar and three‐dimensional molecules, different electron counting rules are employed. Here, the relationship between the Hückel 4 n + 2 rule and the Hirsch 2( n + 1) 2 rule is established based on formal approach considering the electrons as objects in an arbitrary n ‐dimensional space of states . Two types of three‐dimensional aromaticity, referred to as ‘spherical’ (following the 4 n + 2 electron counting rule) and ‘spatial’ (following the 2( n + 1) 2 electron counting rule) are distinguished. A conclusion concerning the boundaries of the Periodic Table of Elements is made based on the same formal approach that no g ‐ (or higher) elements can exist and that possible extension of the Periodic Table beyond the seventh period must be followed by filling of the 8p or inner 6f or 7d levels. Copyright © 2011 John Wiley & Sons, Ltd.