pkandmin Posted March 25, 2009 Share Posted March 25, 2009 For the two molecules trans- and cis-Cl(H)C=C(H)Cl, how do i determine whether or not the C-C stretch is infrared active in each case? Link to comment Share on other sites More sharing options...
Kaeroll Posted March 25, 2009 Share Posted March 25, 2009 From the little information you've given me I'm guessing this a problem of molecular symmetry? Kaeroll Link to comment Share on other sites More sharing options...
Tartaglia Posted April 4, 2009 Share Posted April 4, 2009 cis is point group C2v and trans is C2h For cis the symmetric stretch A1 is active in the z direction (C2 axis) not in the x or y so as the C=C is in direction x or y it can't be active For trans the symmetric stretch Ag is not active in x,y or z. and the C=C is in the x or y direction Or more obviously, there is no change in dipole in either on a C=C stretch Link to comment Share on other sites More sharing options...
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