NMR Flashcards
1
Q
Why do we use proton and carbon 13
A
Their atomic radius is odd
So it has a nuclear spin which creates a weak magnetic field
2
Q
How can an atom be in the same environment
A
Bonded to an atom or groups of atoms that are identical
3
Q
What chemical is used as a standard in carbon NMR
A
Têtramethylsilane
4
Q
Why do use TMS
A
Produce a large single peak
Inert
Non toxic
Volatile (easy to remove)
5
Q
What is chemical shift
A
Difference between TMS peak and the peak produced by the substance
6
Q
What chemical do we use in hydrogen NMR
A
Anything with Detrium D2O, or chloroform-d
Which is known as deuterium has an even number of nucleons so it won’t be detected.
We also use it because we can’t use hydrogen-based solvents as it would interfere with the spectra
