Lecture 1 NMR

Question 1

Spectroscopy

Answer 1

examines the interaction of energy with matter

Question 2

NMR Spectroscopy

Answer 2

energy absorption by molecules that are placed in a strong magnetic field

Question 3

NMR Spectroscopy provides what

Answer 3

information on the chemical structure of an organic molecule

Question 4

NMR Spectroscopy detects what

Answer 4

atomic nuclei and distinguishes the environment they are in within the molecule

Question 5

1H NMR gives info on the types of

Answer 5

1H in a molecule

Question 6

13C NMR gives info on the types of

Answer 6

carbons in a molecule

Question 7

Basics:

A very strong magnetic field is

Answer 7

7 - 14 Tesla

Question 8

Basics:

Earth’s mag field is

Answer 8

25 - 65 microtesla

Question 9

Basics:

Some atomic nuclei 1H and 13C are affected by

Answer 9

strong magnetic fields and they behave like tiny compasses needles and point in direction of applied mag field

Question 10

Basics:

Only certain nuclei are

Answer 10

magentics (1H, 13C, 19F, and 31P)

therefore they are observable by NMR Spectroscopy

Question 11

Basics:

Many nuclei (12C, 16O, 14N) do

Answer 11

not interact with a magnetic field and therefore CANNOT be observed by NMR

Question 12

Basics:

Nuclear Spin unit is

Answer 12

I

Question 13

Basics:

Nuclear spin is

Answer 13

property of a nucleus that governs its magnetic interactions

Question 14

Basics:

Nuclear spin is what type of quantum

Answer 14

Quantized by values of I= 0, 1/2, 1 , 3/2, 2, etc

Question 15

Basics:

Nuclear Spin of 1H

Answer 15

1/2

Question 16

Basics:

Nuclear Spin of 2H

Answer 16

1

Question 17

Basics:

Nuclear Spin of 13C

Answer 17

1/2

Question 18

Basics:

Nuclear Spin of 12C

Answer 18

0 and not NMR active

Question 19

Basics:

For a nucleus in a mag field the nuclear spin can be aligned

Answer 19

with or against the mag field (Bo)

Question 20

Basics:

Protons have how many spin states

Answer 20

Two (-1/2 or +1/2)

Question 21

Basics:

Aligned with =

Answer 21

more stable and low energy (CHECK)

Question 22

Basics:

Aligned against =

Answer 22

unstable and higher energy (CHECK)