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C-NMR
Spectrocospy concepts
5
Chemistry
Undergraduate 2
05/06/2013

Additional Chemistry Flashcards

 


 

Cards

Term
Compare the scale btwn C-NMR & H-NMR
Definition

C-NMR: 0 to 210 ppm

H-NMR: 0 to 12 ppm

Term

13C  NMR usually involve coupling? Why or why not?

 

What is one bond coupling?

Definition

b/c 13C  is rare so the chance of two 13 C atoms being adjacent is RARE

 

however ;

a '1 bond coupling' occurs btwn the carbon atom and the protons diretly attatched to them.

Term
does 13C need a small or large sample for analysis?
Definition

large,

b/c 13 C is rare

Term
what is spin decoupling?
Definition

a feature of 13 C that allows spectrum to be recorded without the coupling of adjacent protons.

 

thus the spectra only concists of SINGLETS; each that are magentically equivalent

Term
again HNMR vs 13C-NMR who has multiplets , who doesnt?
Definition

HNMR has multiplets

 

13C-NMR is rare and will already be adjacent to each other.

 

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