Proton NMR Spectroscopy (OCR A-Level Chemistry A): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
ShowHide
Practise the cards
10 cards from this deck
Reference standard in proton NMR spectroscopy
Reference standard in proton NMR spectroscopy
TMS (tetramethylsilane) at ppm
Four pieces of info from proton NMR spectrum
Four pieces of info from proton NMR spectrum
No. of environments, types, relative nos., adjacent H
Definition of equivalent protons
Definition of equivalent protons
Protons in same chemical environment, absorb at same
Method to identify equivalent protons in molecules
Method to identify equivalent protons in molecules
Look for planes of symmetry in the structure
What integration reveals in proton NMR
What integration reveals in proton NMR
Relative numbers of each type of proton
rule in proton NMR spectroscopy
rule in proton NMR spectroscopy
adjacent H give peaks in splitting pattern
Splitting pattern when (no adjacent H)
Splitting pattern when (no adjacent H)
Singlet (1 peak)
Splitting pattern when (CH₂ adjacent)
Splitting pattern when (CH₂ adjacent)
Triplet (3 peaks, ratio 1:2:1)
Characteristics of OH and NH proton peaks
Characteristics of OH and NH proton peaks
Broad peaks, variable shifts, no spin-spin coupling
Effect of D₂O addition on OH/NH protons
Effect of D₂O addition on OH/NH protons
OH and NH peaks disappear from spectrum