Saturday, 24 September 2016

bond - How can the dipole moment of carbon monoxide be rationalised by molecular orbital theory?



Despite the fact that oxygen is much more electronegative than carbon, the bond in CO presents a weak dipole moment. This observation can easily be explained using the concept of "dative bond", that is, one bond is formed with two electrons from oxygen, producing a polarization OC which equilibrates the expected polarization CO. I would like to know if the molecular orbital model could be used to explain this phenomenon. Here's the diagram for CO:


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