When looking over Chapter 13 one of the muddiest points for me is looking at infrared spectroscopy data and determining what the compound may be. Infrared spectroscopy can be defined as measuring the absorption of the infrared radiation of organic compounds. However, for the absorption to occur the energy of the photon must match the difference of the energy between two states. When a molecule absorbs radiation from the IR it can cause the bonds to bend, stretch which can cause deforming bond lengths and angles. So since different kinds of bonds vibrate at different frequencies they can absorb different frequencies of IR radiation, which then the functional group can be determined. To determine a particular bond on the IR spectroscopy one must look at the bond strength and atom mass due to the fact that bonds form into four predictable regions of an IR spectrum.
References:
1. Characterization techniques for Organic Compounds. 25 January 2011. <http://www.chem.uky.edu/courses/che232/FTL/C1309.pdf>.
2.Infrared Spectroscopy. 25 January 2011. <http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/InfraRed/infrared.htm>.
3. Infrared Spectroscopy. 25 January 2011. <http://www.prenhall.com/settle/chapters/ch15.pdf>.
Your explanation was pretty good. The way I understand it is different bond strengths and different molecules vibrate at different IR frequencies and this is what is read on an IR Spec graph. Learning how to read them and understand them will just take some practice in my opinion. The book is pretty thorough on where certain peaks will occur. Keep up the good work.
ReplyDelete-The High School Chemist
Very good explanation and stating your references. Sometimes googling additional information can really help when trying to understand the concept. After reading the text, it helped me to understand better. I agree with Don, I think it'll be more understanding the more we read them.
ReplyDeleteInfrared spectroscopy was another muddy point I had in chapter 13. I thought you explained what infrared spectroscopy was pretty good and I liked how you used additional resources, like the internet because the internet gives you another view on it. I also agree with Don and Jesslyn and think it'll be more understanding the more we read them, but also just reading the book isn't going to work, I also think practice and memorization will help as well. Overall, good job!
ReplyDelete-Alexia