Principle

NMR spectroscopy is an analytical technique capable of giving a lot of information regarding structure and purity of samples.

Working principle is based on the fact that, in the presence of a high external magnetic field, a spin active nucleus can interact with a specific radiofrequency (nucleus dependant) absorbing it and then emitting a so-called FID, an exponential and sinusoidal sum of radiorequencies, which contains structural-related information.

Most common spin active nuclei are, for example, 1H, 13C, 19F, 29Si and  31P.

Capabilities

NMR in solution is a wide ranging technique: both qualitative and quantitative analyses and structural characterization can be done.

Conditio sine qua non is that samples must be liquid or soluble in deuterated solvents (not necessary when observing 19F nucleus).

Most common analyses are:

- Polymers composition and chain ends analyses

- Fluids characterization and chain ends analyses

- Structural studies

- Identification and quantification of by-products, contaminants and impurities

- Purity evaluation of raw material

- Determination of fluorinated residual in water (process or waste water)

Assets


AssetDetails

Agilent NMR Inova 400

operates at:
399.86 MHz for 1H
376.21 MHz for 19F 

equipped with:
5-mm triple resonance 1H/19F {13C,31P} PFG probe

5-mm ASW PFG probe (to assess other nuclei 29Si, 7Li, 11B, etc)

Agilent DirectDrive System 500

operates at:
499.86 MHz for 1H 470.30 MHz for 19F; 

equipped with:
5-mm triple resonance 1H/19F {13C,31P} PFG probe

5-mm HF direct detection probe

Agilent Mercury 300 (open access)

operating at
299.89 MHz for 1H
282.15 MHz for 19F

equipped with:
5-mm ASW PFG probe (4-Nuc 1H/19F/13C/31P  configuration)



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