IR Spectrometry

Question 1

What is IR spectrometry

Answer 1

IR waves going through a molecule, the molecule responds by stretching and bending

Question 2

What is the range?

Answer 2

667cm-1 (low energy) on the right.

4000cm-1 (high energy) on the left.

Question 3

What area is the finger print zone?

Answer 3

1599-1000cm-1

Question 4

What is located around 3600?

Answer 4

O-H alcohol stretch. Band is broad and blobby. High energy dipole moment

Question 5

What’s at 3500-3300?

Answer 5

N-H stretch. Two peaks is R-NH2. One peak is R-NH-R.

Question 6

Where is C-C bond?

Answer 6

1000-1200

Question 7

Where is C=C bond located?

Answer 7

1600-1660 usually 1650
If at 1600 it conjugated
Two C=C bonds are 1620
Three C=C bonds (conjugated benzene ring) 1600

Question 8

Where is triple bonded Carbon bond?

Answer 8

2100-2200

Question 9

Where is C-O bond located?

Answer 9

1000-1300

Question 10

Where is C=O bond?

Answer 10

Big dip around 1700 usually conjugated. Keytones 1705, esters 1725-1746

Question 11

Where are C-N bonds?

Answer 11

1000-1200

Question 12

Where are C=N bonds?

Answer 12

1650

Question 13

Where are C triple bond N bonds?

Nitrile

Answer 13

2200

Question 14

Where are alkane located?

Answer 14

C-H stretch is at 2900

Question 15

How do you know a carboxylic Acid?

Answer 15

O-H stretch and C=O stretch

Question 16

Where is an ether?

Answer 16

C-O 1000-1150

Question 17

Where is a Nitro Bond?

Answer 17

R-NO2 peak one 1550-1600 peak two 1380

Question 18

How to tell if it’s a benzene?

Answer 18

Three peaks. 1600, 1500 and 1475

Question 19

What’s at 750-700

Answer 19

Out of plane benzene mono sub

Question 20

Stretch at 750-800

Answer 20

Br-cl stretch

Question 21

What is different between aldehyde and keystone?

Answer 21

Aldehyde had c-h stretch at 2700

Question 22

What is different between ester and amide?

Answer 22

C=O ester Is at 1725-1745 more double bond character.

C=O stretch of amide 1680