1. Infrared Spectroscopy

2. Analytical Chemistry • Chromatography (Separations)
• Mass Spectrometry
• Infrared (IR) Spectroscopy
• Nuclear Magnetic Resonance (NMR) Spectroscopy
• X-ray Crystallography (visual solid state molecular structure)

3. The Electromagnetic Spectrum

4. Infrared (IR) Spectroscopy
What insights are we hoping to gain?
• Presence/Absence of Functional Groups

5. Molecular Vibrations

6. The functional group
region
The fingerprint
region

7. Carbon-Hydrogen (C–H) Bonds

10. Heteroatom-Hydrogen (X–H) Bonds

12. Other Single Bonds

13. Carbon-Carbon Bonds

14. Double Bonds

15. Carbonyl Stretching Frequencies

16. Effect of Conjugation

17. Some Examples: Ethyl Benzene

18. Some Examples:
Molecular Ion = 84

19. Some Examples: 2-Methyl-1-Pentene

20. Some Examples:
Molecular Ion = 106

21. Some Examples: Benzaldehyde

22. Some Examples:
Molecular Ion = 56

23. Some Examples: Propargyl Alcohol

24. Some Examples:
Molecular Ion = 148

25. Some Examples: 1-Phenylbutan-2-one