Nuclear Magnetic Resonance Spectroscopy (A Level only) (AQA A-Level Chemistry): Flashcards
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Purpose of NMR spectroscopy
Purpose of NMR spectroscopy
Determines molecular structure of compounds
Isotopes used in NMR
Isotopes used in NMR
and
Why and are used in NMR
Why and are used in NMR
They have nuclear spin
Low-energy spin state name in NMR
Low-energy spin state name in NMR
α-spin state (aligned with field)
High-energy spin state name in NMR
High-energy spin state name in NMR
β-spin state (opposed to field)
Definition of resonance in NMR
Definition of resonance in NMR
Energy absorption causing spin flip from α to β state
Energy needed by shielded nuclei
Energy needed by shielded nuclei
Less energy (electron cloud reduces magnetic field effect)
Energy needed by deshielded nuclei
Energy needed by deshielded nuclei
More energy (stronger effective magnetic field)
Unit of chemical shift measurement
Unit of chemical shift measurement
ppm (parts per million)
Standard reference substance in NMR
Standard reference substance in NMR
TMS (tetramethylsilane)