The p molecular orbitals of 1,3-butadiene
What do the
orbitals look like?
y1 -- lowest
energy p M.O.
-- no nodes other than in
molecular plane:
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y2 -- second
lowest energy p MO
-- one node other than in molecular plane:
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y3 -- first
unoccupied antibonding p MO
-- two nodes other than in
molecular plane:
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y4 -- highest
antibonding p MO
-- 3 nodes other than in molecular plane:
