Jennifer50
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Why is the solvent used CDCl4 even though it contains a carbon, would this not invalidate the reading?
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TSR Jessica
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Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.


Just quoting in Danny Dorito so she can move the thread if needed :wizard:
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TheBlueDjoker
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(Original post by Jennifer50)
Why is the solvent used CDCl4 even though it contains a carbon, would this not invalidate the reading?

NMR spectra are usually measured using solutions of the substance being investigated. A commonly used solvent is CDCl3. This is a trichloromethane (chloroform) molecule in which the hydrogen has been replaced by its isotope, deuterium.

CDCl3 is also commonly used as the solvent in proton-NMR because it doesn't have any ordinary hydrogen nuclei (protons) which would give a line in a proton-NMR spectrum. It does, of course, have a carbon atom - so why doesn't it give a potentially confusing line in a C-13 NMR spectrum?

In fact it does give a line, but the line has an easily recognisable chemical shift and so can be removed from the final spectrum.

Source: http://www.chemguide.co.uk/analysis/...groundc13.html
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