Preferred Label : alternancy symmetry;
IUPAC definition : A topological property of the molecular graphs of alternant hydrocarbons 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).;
Origin ID : AT06985;
See also
A topological property of the molecular graphs of alternant hydrocarbons 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).
