Presentation is loading. Please wait.

Presentation is loading. Please wait.

Electromagnetic Spectrum. 5.7 X 10 5 9.5 X 10 3 1.7 X 10 3 4.8 X 10 2 9.5 X 10 -3 1.27210 -4 Electromagnetic Spectrum (Kcal/mol)

Similar presentations


Presentation on theme: "Electromagnetic Spectrum. 5.7 X 10 5 9.5 X 10 3 1.7 X 10 3 4.8 X 10 2 9.5 X 10 -3 1.27210 -4 Electromagnetic Spectrum (Kcal/mol)"— Presentation transcript:

1 Electromagnetic Spectrum

2 5.7 X X X X X Electromagnetic Spectrum (Kcal/mol)

3 Pi and non-bonding electrons Electromagnetic Spectrum Proton Spin Molecular Rotation Molecular Vibration and rotation nucleus valence electrons

4 Pi and non-bonding electrons Electromagnetic Spectrum Proton Spin Molecular Rotation Molecular Vibration and rotation nucleus NMR MicrowaveInfraredUltraviolet - Visible Mass Spectrometry X-ray diffractometry valence electrons

5 Infrared Spectroscopy To here!From here… Functional Groups: √ OH × C=O × C=C √ C-O Infrared (IR) Spectroscopy gives information on the functional groups within molecules

6

7 Infrared Spectroscopy

8 Typical stretching vibrations of a methylene group 12a–8

9 Different kinds of bending vibrations for a methylene group

10 RockingWaggingTwisting Symmetrical stretching Antisymmetrical stretching Scissoring

11 Schematic diagram of a typical infrared spectrophotometer

12 Fourier Transform Spectrometer, Interferogram and Spectrum

13 Factors affecting IR Stretch Frequency Masses of atoms at ends of a bond Springs connecting small weights vibrate faster than springs with large weights. H-C > C-C H-O > C-O Type of bond (force constant) Shorter, stronger springs vibrate faster than long, weak springs C ≡ C > C=C > C-C Hookes’ Law m2m2 m1m1

14

15 Fig , p. 383 A Good Guide Low EnergyHigh Energy

16 Infrared spectra of 1-hexyne & 1-hexene

17 Infrared spectra of 1-hexene & 1-hexanol

18 Infrared spectra of butanal and 2-butanone

19 A Closer Look at Carbonyl Compounds

20

21


Download ppt "Electromagnetic Spectrum. 5.7 X 10 5 9.5 X 10 3 1.7 X 10 3 4.8 X 10 2 9.5 X 10 -3 1.27210 -4 Electromagnetic Spectrum (Kcal/mol)"

Similar presentations


Ads by Google