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Nuclear Magnetic Resonance (NMR) Spectroscopy 

NMR spectroscopy is an analytical technique used to determine the chemical molecular structure of a compound. NMR provides both quantitative and qualitative data on the composition of a sample. This technique can be used for quality control, for research, to identify an unknown, or to determine the content and purity of a sample.

A simplified description of NMR is that the sample, usually dissolved in a liquid, is placed into the instrument, which contains a magnetic field. A radio frequency pulse is then sent through the sample solution in order to orient the magnetic moments of the nuclei in the solution. As the magnetic moments relax, they exhibit a free induction decay. The free induction decay is Fourier transformed into an NMR spectrum. The NMR spectrum displays chemical shifts for the individual nuclei; and from these chemical shifts, the structure of the compound can be determined.


Impact Analytical currently has a Varian 400MHz NMR System spectrometer, equipped with a broadband Pulse-Field Gradient (PFG) probe for analysis of low frequency X nuclei (15N – 31P).

Typical analyses:

  • proton and carbon-13
  • silicon-29 and fluorine-19


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 The NMR also has variable temperature (-25 to 130 C) capabilities, suitable for analyzing polymers and other materials at high temperature or monitoring chemical reactions at low temperatures. Advanced one and two-dimensional experiments are available and necessary tools for the deconvolution of complex mixtures and materials, especially for pharmaceutical characterization.

These include:

  • APT
  • DEPT
  • COSY
  • The use of PFG

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