Chapter 32- NMR

Question 1

What can NMR show us?

Answer 1

The position and environment in which C13 and H1 are in a molecule, depending on the type of NMR

Question 2

Why does it have to be C13 and H1?

Answer 2

The method requires nuclei with an odd mass to be detected

Question 3

What reference chemical is used in C13 NMR?

Answer 3

TMS, tetramethyl silane Si(CH3)4.
It shows where 0 shift is

Question 4

Why is TMS used as the reference chemical in C13 NMR?

Answer 4

Inert, non-toxic, volatile solvent so easily removed

Question 5

What reference solvents are used for H1 NMR?

Answer 5

CCl4/ CDCl3, D2O, do not contain H1

Question 6

What are the 4 important factors for H1 NMR?

Answer 6

Chemical shift shows the type of environment
No. of peaks shows no. of environments
Integration value shows the number of H1 in each environment
Splitting patterns shows 1 more than the number of H1 bonded to C adjacent to C bonded to H1 in question

Question 7

What are some common parts in H1 NMR?

Answer 7

Quartet splitting pattern, -CH3 adjacent
Triplet splitting pattern, -CH2 adjacent