NMR meets MUSICIANS

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Demo: hexamethyl benzene, ¹³C-CP/MAS

Solid state NMR signals usually are considerably broader than lines obtained in solution NMR. This manifests in a much more rapid decay of the FID. In the present case of a standard sample, hexamethyl benzene (HMB), the acquisition time is only 41 msec. The FID has completely decayed after 20 msec. Note the spinning side bands of the ring carbon signal (isotropic shift delta = 132.3 ppm) due to its large chemical shift anisotropy as compared to the CH₃ group signal with nearly no side bands.

HMB, ¹³C-CP/MAS, FID

HMB, ¹³C-CP/MAS, spectrum

HMB, ¹³C-CP/MAS, FID sound, .aiff

HMB, ¹³C-CP/MAS, FID sound, .wav

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August 20, 1996