1. INFRARED SPECTROSCOPY

3. Electromagnetic Spectrum

4. Bond Stretching

5. High Frequency Stretching Low Frequency Bending

6. Frequency of Absorption Measured in cm-1 (Wavenumbers)

7. High Frequency to Low Frequency

8. General Trends: i) Stretching frequencies are higher than corresponding bending frequencies. (It is easier to bend a bond than to stretch or compress it.) ii) Bonds to hydrogen have higher stretching frequencies than those to heavier atoms. iii) Triple bonds have higher stretching frequencies than corresponding double bonds, which in turn have higher frequencies than single bonds. (Except for bonds to hydrogen).

11. IR Spectrum of Octane

12. Hybridization of Carbon Affects n of Absorption

13. Hexane and Hexene

14. 1-Pentene

15. Terminal Alkynes are Readily Identifiable with IR

16. 1-Heptyne

17. Aromatics C-H str (sp2) at 3050-3100 cm-1
C-C str (breathing) 1600 & 1500 cm-1

18. Toluene

19. Alcohols O-H str at 3600-3200 cm-1 C-O str at 1050-1150 cm-1

20. Cyclohexanol

21. 1o Amines

22. 2-Methylpentanediamine

23. 2o Amine

24. Dipropylamine

25. Carbonyl Compounds

26. Cycloheptanone

27. Acetophenone

28. Conjugation Lowers n of Absorption

29. Ketone and Aldehyde

30. Carboxylic Acid

31. Hexanoic Acid

32. Phenyl Acetate, an Ester

33. Ethyl Butanoate

34. Methyl Benzoate

35. Butanamide, an Amide