29Si NMR measurement using silicon free probe
NM130006E
Standard materials used in NMR probe construction, as well as normal NMR tubes, inevitably contain silicon which is visible as abroad peak in the spectrum. As this is due to a Q4unit, it will overlap at similar chemical shifts to Q3 and Q4 units in any sample being measured. The use of a silicon free probe and suitable tubes completely suppresses the background signal and even small signals can be clearly seen.
29Si spectra without sample

Actually measured data

Spectrometer: JNM-ECAII600
Upper spectrum: Data from standard probe with heat-resistant glass tube
Lower spectrum: Data from Sillicon free probe with PTFE tube
This probe is particularly effective for broad peaks and dilute solutions!
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