The intensity of an isolated peak in a broadband proton decoupled 13C
spectrum may not reflect the number of carbons giving rise to that
signal.
In order to successfully integrate carbon signals one should:
(a) Give up: 13C NMR is not quantitative and spectra cannot be
integrated.
(b) Switch off the decoupler.
(c) Use a pulse delay of 5 times the longest T1
(d) Use a pulse delay of 5 times the longest T1 and switch off the
decoupler.
The 300 MHz 1H NMR spectrum of a compound containing an AX spin-system
shows peaks at 10, 20, 145 and 155 Hz
from the methyl resonance of tetramethylsilane (TMS).
At what frequencies would these lines appear in a 600 MHz spectrum?
(a) The spectrometer is locked to TMS so the values remain the same.