NMR

Question 1

What does NMR stand for?

Answer 1

Nuclear Magnetic Resonance

Question 2

How does NMR work?

Answer 2

-analytical technique that allows the structure of a molecule to be determined

-analyses the energy of each bond environment

-different bond environments absorb different amounts of energy

-hence show up as different peaks on a spectra

Question 3

What is used as the standard and why?

Answer 3

TMS - tetramethylsilane

-it has the same carbon and hydrogen environments, hence gives 1 peak
-inert
-non-toxic
-low BP = can be removed from sample easily

Question 4

What peak does TMS give?

Answer 4

δ = 0ppm

Question 5

What does δ symbol represent?

Question 6

What happens to carbon environments that are near an oxygen atom and why?

Answer 6

-has 2 values that are shifted to the right
-O is very electronegative
-changes the bond environment and how it absorbs energy
-

Question 7

examples of solvents