Chem 161 Chapter 9 Molecular Geometry Worksheet - Shape Determines Function Page 36
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40*
2p
and 2p
atomic orbitals
4 new MOs: two bonding
and two antibonding
,
π
π
→
2p
z
y
2p
which are each offset from the 2p
MOs and one another by 90
.
x
°
– Because the lower MO results from indirect overlap, it is called a bonding
π
MO.
2p
– A bonding MO is lower in energy than the original atomic orbitals.
*
– A node between the nuclei in the upper MO results in a antibonding
MO.
π
2p
– An antibonding MO is higher in energy than the original atomic orbitals.
The following molecular orbital diagram shows the energy levels resulting from two sets of 2s
and 2p atomic orbitals:
– Because of the direct (or head-on) overlap in the bonding
σ
, the interaction between
2p
the 2p
molecular orbitals is stronger than in the 2p
and 2p
, so the bonding
is lower in
σ
x
x
y
2p
energy than either of the bonding
molecular orbitals.
π
2p
CHEM
1 61:
C hapter
9
page
3 6
o f
4 0
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