A topological property of the molecular graphs of alternanthydrocarbons
which allows the carbon atoms to be divided into two subsets in such a way that no
two atoms of the same subset are adjacent. A consequence of this property is the symmetrical
arrangement of the energy levels of bonding and antibonding Hückel MOs relative to
the level of a nonbonding orbital (energy level of the p AO of a carbon atom).
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. https://doi.org/10.1351/goldbook