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Why is C=C IR active?

Question asked by Cameron Lumsden on Jan 8, 2015
Latest reply on Jan 13, 2015 by Geoffrey Chambers

I understand that in order for an bond to IR active, there needs to be a change in the dipole moment of the bond.  This excludes Cl-Cl etc non-polar molecules.  I can never see any reference to a C-C (single) bond absorption, but there is a C=C absorption (also a C-C triple).

In short, why does any C-C bond - and especially the C=C bond absorb IR?

 

Thanks,

 

Cameron

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