N.M.R Spectroscopy

Question 1

What does N.M.R stand for?

Answer 1

Nuclear Magnetic Resonance

Question 2

What atoms are measured in N.M.R ??

Answer 2

C & H

Question 3

What are the 2 axis for N.M.R?

Answer 3

X axis - Chemical Shift (measured in parts per million/ppm)
Y axis - Intensity

Question 4

What do the number of peaks show for the 13C N.M.R ?

Answer 4

Number of C environments (what C is bonded to)

Question 5

What do the number of peaks show for the 1H N.M.R ?

Answer 5

Number of H environments (what H is bonded to

Question 6

What is the Integration Ratio for H N.M.R ?
Outline an example

Answer 6

Shows the number of Hs in each environment
E.G:
CH3COCH2CH3
3:2:3

Question 7

What is the splitting pattern? How do you draw them on the N.M.R graph?

Answer 7

Number of neighbouring Hs (3 bonds apart)
Rule of n+1
Makes small peaks next to large peaks

Question 8

Outline 3 examples of the splitting pattern

Answer 8

1. 0 neighbours
   n+1 -> 0+1 = 1 singlet
2. 2 neighbours
   n+1 -> 2+1 = 3 triplet
3. 3 neighbours
   n+1 -> 3+1 = 4 quartet