AC12: NMR Spec Flashcards

1
Q

What solvent is used to check if there is a H in a -OH or -NH group and how does this work

A

deuterium - heavy water
add D2O to sample, H in OH / NH peak disappears.

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2
Q

What does NMR stand for

A

Nuclear Magnetic Resonance

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3
Q

Give one use of NMR

A

MRI scans

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4
Q

What kind of nuclei does NMR work with

A

Those with uneven number of nucleons - proton and 13 carbon

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5
Q

What does the area under the peak represent for proton NMR

A

proportional to the number of proton atoms

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6
Q

What is the integration trace in NMR

A

A stepped line that makes it easier to measure the area under the curve

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7
Q

When does splitting/spin-spin coupling occur in NMR

A

neighbouring Hydrogen atoms (on adjacent atoms) affect the magnetic field of protons and causes their peaks to split

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8
Q

What is the n+1 rule in NMR

A

If there are n inequivalent protons on the neighbouring carbon, then the peak will split into n+1 smaller peaks

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9
Q

Why does the peak from O-H or N-H bonds disappear if D2O is used as a solvent

A

H in O-H / N-H is substituted by D

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