joho Posted October 16, 2006 Report Share Posted October 16, 2006 What parts of the cocaine molecule are responsible for UV absorbance? Now I understand that this is the shared and lone pair electrons and the aromatic rings, but not sure why and where the electrons are.:eek_big: Quote Link to comment Share on other sites More sharing options...
Igby Posted November 4, 2006 Report Share Posted November 4, 2006 Well, radiation in the UV and visible regions of the spectrum has the energy to excite electrons in one bonding orbital into an orbital with a higher energy. The electrons which are more easily bunted into a higher orbital are electrons which are involved in "conjugated pi-bonds". Basically, a conjugated molecule has alternating single and double/triple bonds in at least part of the molecule. Aromatic rings, of course, are conjugated. Any further explanation than that is beyond me. Heh. :hihi: Quote Link to comment Share on other sites More sharing options...
joho Posted November 8, 2006 Author Report Share Posted November 8, 2006 Thanks Igby. Quote Link to comment Share on other sites More sharing options...
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