Organic Analysis -IR Spectroscopy Flashcards
1
Q
What 4 things could happen when molecules are exposed to IR radiation?
A
. Electrons can change energy levels.
. Bonds can change the way they vibrate. (Up or down)
. Molecules can rotate or change direction.
. They can move from one place to another.
2
Q
Define IR spectroscopy.
A
The change that occurs as the bonds in the molecule vibrate.
3
Q
How do we get an IR spectrum?
A
. The vibration of the bonds in the molecule are quantised.
. Each bond required a different amount of energy.
4
Q
State the equation for wavenumbers.
A
1/lambda
5
Q
Why do we use wavenumbers?
A
The environment will change the energy needed slightly.
6
Q
How big are polar groups’ absorptions?
A
Intense. (Therefore, they are long and fat).
7
Q
What is the region called that’s below 1500cm^-1?
A
Fingerprint region.
