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Nuclear Magnetic Resonance

NMR is an important analytical technique in Organic Chemistry.
by

Cycling Scientist

on 20 June 2012

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Transcript of Nuclear Magnetic Resonance

Nuclear Magnetic Resonance Nuclei 1-H 13-C Chemical Shift Integration Splitting Number of Signals Four Analytical Features How many separate signals? This tells you
how many different
H environments
there are. The position of the signal
on the scale (in ppm) Proportional to the number of H atoms
that contribute to the signal This is calculated from
the area under the peaks
rather than peak height The number of near neighbours (n)
determines the number of lines
that make up the signal (n+1). This is where the real power of nmr
is seen. The signals are "connected" so molecules can be
built up from the parts. such as and have a property called
spin which makes them
behave like
mini bar magnets The experiment is carried out
in a powerful magnet which
gives each nucleus two possible
energy states The difference between these
states has the same energy as
radio waves. The frequency of the radio waves
is dependent on the magnet,
the nucleus and the environment
it is in. NMR Allows identification of direct environment of the proton as other atoms bonded to the same carbon atom can alter the position of the signal on the scale.
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