CHEMISTRY 30AL WINTER 2003 NOTE: THERE IS NO PRELAB FOR THIS "EXPERIMENT". EXPERIMENT #14 - POSTLAB REPORT GUIDELINES FOR THE "INFRARED SPECTROSCOPY" EXPERIMENT. THIS IS A GROUP REPORT. MAKE SURE THAT YOUR GROUP COMPLETES ALL THE FOLLOWING ITEMS BEFORE TURING IN THE GROUP REPORT. REFER TO THE LAB SCHEDULE FOR DUE DATE. FOR THIS REPORT, YOU MAY ANSWER ALL THE QUESTIONS ON THE IR WORKSHEETS. (I) Completed IR worksheets for the 5 molecules. The 5 molecules are: 2 "different" carbon dioxide; acetic acid; propionamide and allyl benzoate. (II) Compare the vibrational frequencies and modes of carbon dioxide calculated by the TWO different theoretical methods (the ones you did on Spartan in the lab) with the experimental spectrum (read page 120 of the lab manual). (III) Label ALL the bond angles, distances and strain energy for the molecule of caffeine. (IV) Analyze the LITERATURE caffeine IR spectrum by identifying as many vibrational motions you can on the spectrum. The literature caffeine IR spectrum is attached on the last page of your IR worksheets. If you already turned in the IR worksheets, go to the following web site to obtain the IR spectrum of pure caffeine: http://chemfinder.cambridgesoft.com/ In the search engine, type "caffeine". Scroll down the screen and there should be an item called "NIST Chemistry WebBook". Click on "Information for this particular compound" under the NIST link. You should be able to find the gas phase IR spectrum of pure
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