¹³C NMR (AQA A-Level Chemistry): Flashcards
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Purpose of ¹³C NMR spectroscopy
Purpose of ¹³C NMR spectroscopy
Analyzes carbon atom environments in molecules
What each peak in ¹³C NMR represents
What each peak in ¹³C NMR represents
A unique carbon environment
Natural abundance of ¹³C nuclei (%)
Natural abundance of ¹³C nuclei (%)
1.1%
Effect of electronegative groups on ¹³C shift
Effect of electronegative groups on ¹³C shift
Shift downfield (higher ppm)
TMS reference chemical shift value (ppm)
TMS reference chemical shift value (ppm)
0 ppm
¹³C-¹H coupling pattern for groups
¹³C-¹H coupling pattern for groups
Quartets
Purpose of decoupling in ¹³C NMR
Purpose of decoupling in ¹³C NMR
Removes ¹³C-¹H coupling, shows each C as singlet
Chemical shift range for ¹³C NMR (ppm)
Chemical shift range for ¹³C NMR (ppm)
0 to 220 ppm
Why ¹³C-¹³C spin-spin splitting is rare
Why ¹³C-¹³C spin-spin splitting is rare
Low natural abundance of ¹³C (1.1%)
Chemical shift range for benzene ring carbons (ppm)
Chemical shift range for benzene ring carbons (ppm)
125 to 140 ppm