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Topic: Determining Point group of Trans-dichloroethylene  (Read 5802 times)

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Offline yang09

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Determining Point group of Trans-dichloroethylene
« on: September 20, 2011, 02:59:43 PM »
Question: Determine the Point group of Trans-dichloroethylene

So the symmetries I found were the Identity symmetry(E), the inversion symmetry(i), and the vertical mirror plane inversion( the mirror is on the plane of the paper, cutting each molecule in half). But from here, I'm lost. I know the point group is not going to be a C,D or S group because there are no rotational axis, atleast that I didn't see. It's either a Ci or sigmav, but I don't know which. Any help is appreciated

Offline DevaDevil

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Re: Determining Point group of Trans-dichloroethylene
« Reply #1 on: September 20, 2011, 06:01:03 PM »
how about the 180o rotation along the C=C bond?

Cl1         H2
  \         /
   C1 = C2
  /         \
H1         Cl2

and rotated

Cl2         H1
  \         /
   C2 = C1
  /         \
H2         Cl1

Offline Jorriss

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Re: Determining Point group of Trans-dichloroethylene
« Reply #2 on: September 22, 2011, 08:58:38 PM »
I haven't done point groups in a few months but are you sure it's a vertical mirror plane?

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