Provided it isn't sealed in some sort of container, you could twist the needle around with your fingers so that it pointed south - lining it up opposed to the Earth's magnetic field. If you have a compass needle, it normally lines up with the Earth's magnetic field with the north-seeking end pointing north. The effect of this is that a C-13 nucleus can behave as a little magnet. C-13 NMR relies on the magnetic properties of the C-13 nuclei.Ĭarbon-13 nuclei fall into a class known as "spin ½" nuclei for reasons which don't really need to concern us at the introductory level this page is aimed at (UK A level and its equivalents). On this page we are focussing on the magnetic behaviour of carbon-13 nuclei.Ībout 1% of all carbon atoms are the C-13 isotope the rest (apart from tiny amounts of the radioactive C-14) is C-12. Nuclear magnetic resonance is concerned with the magnetic properties of certain nuclei. This page describes what a C-13 NMR spectrum is and how it tells you useful things about the carbon atoms in organic molecules.
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