Chemical Forums
Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: yang09 on September 20, 2011, 02:59:43 PM
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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
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how about the 180o rotation along the C=C bond?
Cl1 H2
\ /
C1 = C2
/ \
H1 Cl2
and rotated
Cl2 H1
\ /
C2 = C1
/ \
H2 Cl1
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I haven't done point groups in a few months but are you sure it's a vertical mirror plane?