Assignment 5 NMR Guided Reading February 24

Assignment 5
NMR Guided Reading
February 24, 2000

Concepts to make sure you understand after reading about Becker's book:

	The electron spin polarization transfer mechanism for spin-spin coupling,
	The difference between 1st-order and higher-order coupling patterns,
	The origin of the n+1 rule for determining multiplet structure (e.g. what would the rule be for ²H coupling),
	At what point first-order analysis is not possible,
	The Karplus curve.

Questions which might help you think about these ideas are the following:

From the end of the chapter: questions 2 and 3. For question 3, what will the ¹⁴N spectrum look like from ¹⁴NH₃? What will the proton spectrum look like from ¹⁴NH₃? What about the deuterium spectrum of ¹⁵ND₃ and the ¹⁵N spectrum from ¹⁵ND₃?

How could you identify which of the following two compounds is which?

Why would it be difficult to tell the difference between these two compounds?

Your answers to these last two questions should be in terms of the Karplus curve. Models may be helpful.