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Topic: Point Group/Symmetry  (Read 3548 times)

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Offline RHSLilSweetie07

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Point Group/Symmetry
« on: March 02, 2010, 07:58:13 PM »
What is the point group of 2,5-dichloro-1,4-benozoquinone? It is planar.

I'm am guessing D2h, but I don't think I'm right.
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Offline cpncoop

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Re: Point Group/Symmetry
« Reply #1 on: March 02, 2010, 08:32:22 PM »
I think it's C2V symmetric.
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Offline cth

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Re: Point Group/Symmetry
« Reply #2 on: March 02, 2010, 09:31:30 PM »
Symmetry elements of that molecule: one mirror plane, one C2 axis perpendicular to it and an inversion centre in the middle.

If you look up in the point group symmetry character tables, you find that it corresponds to C2h http://www.webqc.org/symmetrypointgroup-c2h.html.

It can't be D2h or C2v because that molecule doesn't have two mirror planes perpendicular to it.
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Offline cpncoop

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Re: Point Group/Symmetry
« Reply #3 on: March 05, 2010, 07:02:10 PM »
Oops... I had drawn out the 2,6 compound.  I agree with your assesment of the 2,5 compound.
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