6.3.2 Spectroscopy (incomplete)

What does NMR stand for?

nuclear magnetic resonance

How is NMR used in medicine?

MRI scans

Give 2 types of NMR

• C-NMR

• H1-NMR

What region of the electromagnetic spectrum is NMR involved in?

low energy radio waves

What are the 2 main features of carbon NMR spectrums?

• peak position

• number of peaks

What does position of the peak tell you?

the type of carbon

What does the number of peals tell you?

the nuber of different carbon environments

What may the area under a C NMR peak tell you?

the relative ratio of carbons in that environment

Why may area under a peak not be representatuve in C-NMR?

only 1% of carbon atoms are C-13 atoms

What is chemical shift of C-NMR relative to?

TMS (tetramethylsilane)

What is the formula of tetramethylsilane

(CH3)4Si

Draw TMS

Why is TMS the internal standard?

• all 4 carbons are in the same environment

• all 12 hydrogens are in the same environment

What does TMS produce on a C-NMR spectrum?

singe peak where shift = 0