some bonds because bonding and antibonding characteristics differ
between the HOMO and LUMO. For example, a carbon-carbon bond in a
linear polyene may have bonding character in the HOMO and
antibonding character in the LUMO. Therefore, promotion of an
electron from the HOMO to the LUMO weakens their carbon-carbon bond
in the excited electronic state, relative to the ground electronic
state.
Look at the equation below:
9E.2
- Electronic Excitation Of A Molecule May Weaken Or Strengthen Some Bonds Because Bonding And Antibonding Characteristics 1 (1.87 KiB) Viewed 68 times
- Electronic Excitation Of A Molecule May Weaken Or Strengthen Some Bonds Because Bonding And Antibonding Characteristics 2 (7.9 KiB) Viewed 68 times
- Electronic Excitation Of A Molecule May Weaken Or Strengthen Some Bonds Because Bonding And Antibonding Characteristics 3 (11.84 KiB) Viewed 68 times
a -6 – α + 6) (α - b) α-Ε β = (α-Ε)' -β” (α-E+β)(α-Ε-β)=0 β α-Ε
and discuss in detail any changes in bond order that accompany the Tiit ultraviolet absorptions in butadiene and benzene.