Liquid- and solid-state 900 MHz NMR spectrometer (ULille)

NMR

Description

NMR spectroscopy is a powerful method to probe the atomic-scale structure and dynamics of a wide range of soft matter samples, including polymer materials, nanocomposites, gels, colloids, surfactant self-assemblies, biomacromolecules and liquid crystals. Because NMR gives information on the local atomic scale, it can easily characterize the bonding environment of atoms in soft materials, which often lack long-range positional order. Furthermore, NMR is a sensitive probe of local dynamics at atomic scale over timescales spanning 15 orders of magnitude, from 10^-12 s to 10² s. It can thus be used to study motions, including bond vibrations, conformational changes, rotational and translational motions of the molecules. 

This high-field (21.1 T) NMR spectrometer is equipped with 4 probes for liquids and 4 probes for solids. High-magnetic field improves the resolution and the sensitivity of NMR spectroscopy. Furthermore, this spectrometer is equipped with a 5 mm ¹H/¹³C/¹⁵N/²H cryogenic probe for the study of liquid-state samples. The cryogenic cooling of the probe enhances the sensitivity of liquid-state NMR spectroscopy, and is thus useful for the study of macromolecules. This spectrometer is also equipped with a sample changer (96 positions) for liquid-state NMR samples, which allows the batch screening of a large collections of samples. This instrument is also equipped with 4 probes for the acquisition of NMR spectra of solids under Magic Angle Spinning (MAS) conditions. These probes are suitable for rotors with outer diameters from 7 to 1.3 mm. The 1.3 mm probe permits (i) the acquisition of high-resolution proton spectra in solids and (ii) the detection of low-volume samples. Conversely, the 7 mm probe is dedicated to the observation of insensitive isotopes with low gyromagnetic ratio, such as ¹⁴N, ¹⁷O, ²⁵Mg, and ⁴³Ca. This spectrometer is also equipped with a High-resolution MAS (HR-MAS) probe for the study of soft matter (swollen polymers, membranes, colloidal dispersions). 

The specifications of the instrument are listed below:

Field: 21.1 T

Console: Bruker BioSpin Avance Neo 900 MHz 4 channels

Sample changer: SampleJet (96 positions) with temperature at 6, 16°C or room temperature

Temperature: BCU II for variable temperature NMR experiments

Liquid-state NMR probes: 

• 5 mm ¹H/¹³C/¹⁵N/²H cryogenic probe with z-gradient, temperature range: [-40; 80°C];
• 4 mm ¹H/¹³C/¹⁵N/²H HR-MAS probe with z-gradient, temperature range: [2; 50°C];
• 5 mm BBO probe (tuning range: ¹⁰⁹Ag-³¹P) with z-gradient, temperature range: [-150; +180°C];
• 5 mm TXI ¹H/¹³C/¹⁵N/²H probe with z-gradient, temperature range: [-150; +150°C].

 

Solid-state NMR probes:  

• 7 mm HX low-γ (¹⁴³Nd-¹⁵N) VTN MAS probe;
• 2.5 mm HX (¹⁴N-³¹P) DVT MAS probe;
• 1.3 mm HX (¹⁴N-³¹P) DVT MAS probe;
• 3.2 mm ¹H/¹³C/¹⁵N VTN MAS probe. 

 

 

 

Local Contacts

• Dr. Julien TREBOSC
• Prof. Olivier Lafon
• Dr. Bertrand Doumert

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