The difference between the values of the absolute hardnesses
(
)
of a given molecule and the corresponding reference structure (
):
.
The values of relative hardnesses correlate well with the
resonance energies of cyclic compounds and may be used as an index of
aromaticity.
Source:
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
doi:10.1351/goldbook.
