Summary of IR Stretching Frequencies Flashcards
1
Q
<p>alcohol (O-H)</p>
A
<p>3300 - always broad</p>
2
Q
<p>amine, amide (N-H)</p>
A
<p>3300 - may be broad, sharp, or broad with spikes</p>
3
Q
<p>alkyne </p>
A
<p>3300 - always sharp, usually strong</p>
4
Q
<p>alkane (C-H)</p>
A
<p>just below 3000</p>
5
Q
<p>alkene (C-H)</p>
A
<p>just above 3000</p>
6
Q
<p>acid (O-H)</p>
A
<p>3000 - very broad</p>
7
Q
<p>alkyne (C-C)</p>
A
<p>just below 2200</p>
8
Q
<p>nitrile (C-triplebond-N)</p>
A
<p>just above 2200</p>
9
Q
ketones
A
1710
10
Q
aldehydes
A
about 1725 (C=O) and peaks at 2720 + 2820 (C-H)
11
Q
<p>esters</p>
A
<p>higher than aldehydes, about 1735</p>
12
Q
<p>alkene isolated (C-C)</p>
A
<p>1660</p>
13
Q
<p>aromatic alkene (C-C)</p>
A
<p>aromatic double bond is about 1600</p>
14
Q
imine (C=N)
A
stronger than C=C, 1660
15
Q
alkene conjugated (C-C)
A
1630
