C13 NMR 1H 13C 15N 19F Common nuclei which have a magnetic moment: (Odd mass number or even mass number and odd atomic number)
C13 Only 1.1% of the carbon atoms in a sample are C13 C12 does not have a magnetic moment.
C13 NMR Signal weak No C-C coupling Strong C-H coupling Large Chemical Shifts
C13 Chemical Shifts ppm from TMS 65 - 90 0 - 35 15 -40 100 - 150 25 - 50 110 - 175 25 - 50 190 - 220
Proton NMR Spectrum
Carbon NMR Spectrum (Proton Decoupled)
Peak height (area) NOT proportional to number of C atoms.
Proton decoupled CMR
Proton coupled CMR