Discuss the scope, consequences and limitations of the approximations on which the Hückel method is based
Discuss the scope, consequences and limitations of the approximations on which the Hückel method is based
Homework Answers
Answer:
The introduction of Huckel approximations by Huckel in 1931 gave scope to successfully apply the Molecular Orbital Theory to large conjugated systems. The Huckel method considers only the delocalized p - electrons moving in pi-bonds.
The Huckel Approximation is used to find the energies and shapes
of the pi - molecular orbitals in conjugated systems. The Huckel
method separated the covalent bonding into two frameworks, one is
"
" - bonding frame
work and other one is "
" - bonding frame
work.
Limitations of Huckel Method:
- Huckel theory is very approximate.
- Huckel theory cannot calculate the molecular orbital energies accurately.
- Huckel theory cannot calculate the electron - electron repulsions.
- Huckel theory cannot estimate the predicted dipole moments correctly.
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Discuss the scope, consequences and limitations of the
approximations on which the Hückel method is based
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