Past exam of the chemistry A course of the University of Cambridge / 2022 / Paper 1 / A4 / c / i / 2

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- Solution 2

Solution

For

β_{L} = 0

, four isolated short-bond dimers each contribute

2 (α + β_{S})

:

E_{π}^{dimers} = 8 α + 8 β_{S} .

These are different coupling limits. Keeping

β_{S} = β

while simply removing long-bond coupling does not represent a small distortion at fixed mean bond strength.

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