IR Presentation By John H. Penn Visualization of Vibrations - - PowerPoint PPT Presentation

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IR Presentation By John H. Penn Visualization of Vibrations - - PowerPoint PPT Presentation

Nov 09, 2023 192 likes •352 views

IR Presentation By John H. Penn Visualization of Vibrations Methyl amine (all 15 vibrations) http://cheminf.cmbi.ru.nl/wetche/organic/vibr/ H2O, CO2, and Adamantane http://www.chm.bris.ac.uk/jmol/jmolv/vibrating

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SLIDE 1

IR Presentation

By John H. Penn

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SLIDE 2

Visualization of Vibrations

  • Methyl amine (all 15 vibrations)

– http://cheminf.cmbi.ru.nl/wetche/organic/vibr/

  • H2O, CO2, and Adamantane

– http://www.chm.bris.ac.uk/jmol/jmolv/vibrating mols/vibmenu.htm

  • Quite a few molecules

– http://www.molwave.com/software/3dnormalm

  • des/3dnormalmodes.htm
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SLIDE 3

Cyclohexane

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SLIDE 4

1-Propanol

OH

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SLIDE 5

Propanenitrile

C N

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SLIDE 6

Cyclohexanone

O

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SLIDE 7

Heptanoic acid

OH O

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SLIDE 8

Ethanoic acid

OH O

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SLIDE 9

2-Methylpentanal

H O

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SLIDE 10

Methyl Ethanoate

O OMe

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SLIDE 11

Interpreting IR Spectra

Major Functional Groups Alcohol 3400-3600 cm-1 Nitrile 2220-2260 cm-1 Amine 3200-3400 cm-1 Carbonyl Group 1650-1780 cm-1 OH group 3400-3600 cm-1 Broad Carboxylic Acid C-O Stretch 1050-1250 cm-1 Ester C-H Shoulder Exactly 2750 cm-1 Aldehyde No Other Features Ketone

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SLIDE 12

What functional groups?

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SLIDE 13

What functional groups?

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SLIDE 14

What functional groups?

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SLIDE 15

What functional groups?