Unformatted text preview: f the side bar and click Go. 13. Repeat steps 8 – 12 for each additional organic liquid to be studied. 14. If you need to open any of the spectra again you will find the files in the following folder: D:\Documents and Settings\Nick\My Documents\My IR Spectra\chemistry 2302 student\<Today`s Date>\ Page 4 of 6 Chem 2302 Organic IR Winter 2012 Results You will follow the following steps to develop a model for predicting absorption wavenumbers for functional groups in covalently bonded organic molecules: Experiment Analyze Calculate • Measure IR spectra of common organic molecles • Print spectra • Iden�fy all stretching modes • Record peak absorp�on wavenumbers • Eﬀec�ve single-‐bond force constants for "diatomic molecules" • Average Predict Op�mize Check / Test • Use average eﬀec�ve force constant to predict absorp�on wavenumbers for all diatomic func�onal groups • Plot predicted vs observed wavenumbers • regression analysis to determine slope of best-‐ﬁt line • Calc op�mized value of force constant • Re-‐plot graph and check that slope is very close to 1 Extrapolate Using a table of group frequencies (see handout provided to you during the experiment) iden 2002. Page 6 of 6...
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This document was uploaded on 03/06/2014 for the course CHEM 2302 at Memorial University.
- Winter '14