Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is...
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![Page 1: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/1.jpg)
Questions of the day:
Which absorptions on an IR spectrum would show you a) that your unknown is probably a ketone or aldehyde?
b) that your unknown is probably a carboxylic acid?
![Page 2: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/2.jpg)
Today:
• Inert compounds
• IR; UV
Next time:
Mass spectrometry
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“Inert Compounds”
Alkanes
Aromatic Hydrocarbons
(Alkyl halides. Aryl halides.)
![Page 4: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/4.jpg)
• What information do we get from an IR spectrum?
• What is the cause for the typical absorptions?
Spectroscopy
Infrared Spectroscopy (IR)
• IR region = 4000 - 400 cm-1 (cm-1 unit is the wave number scale and is given by 1/wavelength in cm) E= h
http://www.chem.ucla.edu/~webspectra/index.html
![Page 5: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/5.jpg)
butyl acetate
Fingerprint region
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http://www.chem.ucla.edu/~webspectra/index.html
![Page 7: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/7.jpg)
http://www.chem.ucla.edu/~webspectra/index.html
![Page 8: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/8.jpg)
Aromaticsaromatic overtones
![Page 9: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/9.jpg)
http://www.chem.ucla.edu/~webspectra/index.html
![Page 10: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/10.jpg)
http://www.chem.ucla.edu/~webspectra/index.html
![Page 11: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/11.jpg)
Alcohols
Gas phase!
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Phenol
![Page 13: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/13.jpg)
![Page 14: Questions of the day: Which absorptions on an IR spectrum would show you a)that your unknown is probably a ketone or aldehyde? b) that your unknown is.](https://reader036.fdocuments.in/reader036/viewer/2022062805/5697bfc91a28abf838ca8c04/html5/thumbnails/14.jpg)
Ketones
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Carboxylic Acids
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See Chapter in your Lecture text (conjugated systems)
to* HOMO to LUMO
A = x C x l
A = absorbance; = molar absorptivity
C = concentration in mol/L; l = sample pathlength in cm
UV/Visible Spectrophotometry
Which compounds generally absorb in the UV? CH4? CH3(CH2)10CH3? Ethanol? Benzene?
Naphtalene? -Carotene? FeCl3?
Which compounds absorb in the visible range?CH4? CH3(CH2)10CH3? Ethanol? Benzene?
Naphtalene? -Carotene? FeCl3?
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UV/Visible Spectrophotometry
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max
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Next time:
• Mass Spectrometry
• MiniQuiz on today’s class
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Complete this reaction equation:
MiniQuiz 8 Problem:
NH2
OH
NO2
NO2
O2
N
+