F' J' Grieman

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F. J. Grieman
Molecular Bonding (5) Correlation and Molecular
Orbital Energy Diagrams H2 He2 Bond Order,
Stability Homonuclear Diatomics sigma pi
molecular orbitals from 2s and 2p bonding and
antibonding s p molecular orbitals Correlation
and Molecular Orbital Energy Diagrams
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Correlation Diagram Molecular Orbital Energy
Diagram
Use Auf Bau, Pauli, and Hund to predict bond
orders H2 Bond Order 1/2 ½ H2
Bond Order 2-0/2 1 He2 Bond Order
2-1 ½ He2 Bond Order 2-2/2 0 !!!!
Predicted to not exist!
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Molecular Electron Configurations similar to
atom electron configurations
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Homonuclear Diatomics A2 Experimental
results to explain Li2, B2, C2, N2, O2, F2
exist Be2, Ne2 dont exist Change in bond
distance and bond energy of molecules that
exist O2 paramagnetic, N2 diamagnetic !!! C2,
N2, O2 reactivity? C2very reactive, N2
relatively unreactive, O2 oxidation!
Chalkboard
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MOs from p orbitals First consider symmetry
Equal amount of constructive and destructive
interference results in NO interaction
Fig. 18-4
B
z axis
2pz , B
2px, A
Mistake in text should be x or y
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Homonuclear Diatomic Correlation Diagram