(Answer) Interpretation of UV, NMR, IR, and Mass Spec. Data – Part 2

Objectives

After completing this lab activity, you should be able to,

1. Carry out a research-based experiments and identify unknown organic compounds.
2. Identify the common organic compounds’ functional groups and determine the structure of an unknown compound using UV/Vis, IR, Mass, and NMR spectroscopes.
3. Use Material Safety Data Sheets (MSDS) to obtain information such as molecular formula, physical properties, hazards, and disposal procedures for chemicals used in each experiment.
4. Prepare and maintain a laboratory notebook, including a write-up of each experiment that details the purpose, chemical equations, calculation of theoretical yield, percent yield, and record of experimental observations.
5. Write clear, concise, scientific laboratory reports using American Chemical Society style for each experiment.
6. Use critical analysis skills to interpret data and draw conclusions.

LAB ACTIVITY

Answer all the questions and produce a lab report.

Q.1 Describe all possible IR signals for the following compounds:

Q.2 Describe all possible 1H NMR peaks in the following compound:

Q.3. Describe the changes of n, pi, and pi* transitions in the UV-Visible absorption spectrum of an alpha, beta unsaturated carbonyl compound with increasing solvent polarity.

Q.4. Determine the correct structure of the compound, which shows following 13C NMR DEPT-135 data is 13C NMR DEPT-135: negative peaks at δ30.2, 31.9, 61.8, 114.7 ppm; positive peak at 130.4 ppm

ANSWER

Question 1: Describe all possible IR signals for the following compounds;

(1)

An IR spectrum shows the type of vibrational modes a molecule responds with after absorbing light. Notably, when one identifies the peaks that corresponds to the particular motions in the spectrum, then one can figure out the functional groups that the molecule has and it is possible to tell the particular molecule (Su, 2013). In this case, the compound is Azobenzene. It contains two phenyl rings that are linked by a N=N bond. The compounds IR spectrum is shown in the graph below;

Therefore, possible IR signals are;

(2)

The compound contains C-H stretch, C-O stretch, C=C stretch, and C-H bending groups. In that case, it could produce IR signals at;…

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