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NMR spectroscopy

By | Jan. 2014
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Organic Chemistry
Interpreting NMR spectra (C13 and H1)
12/6/12
Interpreting NMR spectra
NMR spectroscopy, also known as Nuclear Magnetic Resonance, is a form of spectroscopy that deals with the magnetic properties of organic compounds. This type of spectroscopy applies to the atoms of a molecule magnetic moments due to their nuclear spin properties. The process of NMR spectroscopy reveals the type, number and positions of the atoms with magnetic presence in the molecule to be determined if done properly. The technique that will be described later is of C13 and the hydrogens (H10) that surround it. This is also known as C13 spectroscopy and proton spectroscopy. This type of spectroscopy is less common than IR spectroscopy, but still an effective way of determining structure of certain organic compounds. NMR spectroscopy works by when the magnetic pulse of the machine interacts with the molecule, the nucleus will either be with or against the field. This is true to both C13 and proton spectroscopy. Because the molecules have charged poles, positive and negative, this allows the molecule to be with or against the magnetic field of the machine depending on the compound being tested. Hydrogen has two nuclear spin states (+1/2 and -1/2), and they can either be aligned with the magnetic field (+1/2) or against it (-1/2). Most of them align with the field in lower energy spin states. The frequency of radiation needed to cause nuclear spin in directly in correlation with the strength of the magnetic field being applied. Also, within this technique the radio waves applied to the molecule are what get the atoms moving and can cause them to flip to be observed. This how the atoms are able to be seen on your data, because they have magnetic fields of their own once they come into contact with the machines magnetic field this will tell you how many radio waves needed to get them to flip so that you can actually observe them. All the radio waves really do in the...
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