Benzene

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Fred J. Grieman
Benzene Molecular Orbital Theory Delocalized
MOs Molecular Motion, Energy Spectroscopy
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Energy Levels, Spectroscopy, Molecular
Properties
Quantized Energy Levels Atoms
1s22s2p2 ______ E?

1s22s22p ______
2p ___ ___ ___ 2s ___ 1s ___
E? Atomic Line Spectra
Molecules also have electronic energy levels and
spectra
Excited state
_______ e.g. N2
_______ Gound
state
Why several bands and not one line?
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Molecules electronic motion and nuclear motion
Vibration
Rotation
Vibrational and Rotational Energies are Quantized
Also !!!!!
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Colorimetric Determination of Manganese
Absorption Spectrum of MnO4-
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Information from Spectroscopy?
3.333 x 10-4
5.000 x 10-4 4.000 x
10-4 1.00 x 10-3



Wavelength (meters)
Infrared Region
of CH2Cl2
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What else? What do vibrational and rotational
energies depend on?
Demonstrations
From _____________ If you can obtain the
___________, you can determine
, and the
______________ of bonds