Electronic excitation of a molecule may weaken or strengthen some bonds because bonding and antibonding characteristics
Posted: Mon May 16, 2022 10:50 pm
Electronic excitation of a molecule may weaken or strengthen
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
9E.4
V=GYA+CVB
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.
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 69 times
- Electronic Excitation Of A Molecule May Weaken Or Strengthen Some Bonds Because Bonding And Antibonding Characteristics 2 (7.9 KiB) Viewed 69 times
- Electronic Excitation Of A Molecule May Weaken Or Strengthen Some Bonds Because Bonding And Antibonding Characteristics 3 (11.84 KiB) Viewed 69 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.