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Topic: what is meant by priciple axis C4, C2?  (Read 7887 times)

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Offline fishingcat

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what is meant by priciple axis C4, C2?
« on: January 23, 2008, 10:48:39 AM »
HI there! it's my first time posting. i'm stuck on the Mulliken symbols. what is meant by priciple axis C4, C2? how is the notation C4, C2 be stated? why a1g is a very symmetric system in octahedral?
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Offline Kryolith

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Re: what is meant by priciple axis C4, C2?
« Reply #1 on: January 23, 2008, 05:43:38 PM »
Quote from: fishingcat on January 23, 2008, 10:48:39 AM
what is meant by priciple axis C4, C2?

Benzene for example has one six-fold axis C6 and six twofold axes C2. If a molecule
has several rotational axes, then the one of them with the greatest value of n is called the principal axis. Was this your question actually?

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Offline Alpha-Omega

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Re: what is meant by priciple axis C4, C2?
« Reply #2 on: January 23, 2008, 08:25:42 PM »
To explain A1g for an octahedral you need to look at the point groups for an octahedral molecule:

Here is a link to an Oh POINT GROUP:  http://www.webqc.org/symmetrypointgroup-oh.html

If you perform all the symmetry operations for A1g you can see that the object (bonding orbital) remains the same after each symmetry operation 1 = unchanged-there is no change and is completely symmetric.
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