Il 7 e il 9 luglio, dalle 10 alle 12, il prof Stéphane Viel (Aix-Marseille Université & CNRS), visiting professor presso il nostro Dipartimento, svolgerà due seminari rivolti ai dottorandi, aperti a tutti.
Seminar 1 (7 luglio) Principles and selected applications of Diffusion Ordered NMR Spectroscopy | Seminar 2 (9 luglio) Structural investigation of organic materials by solid-state dynamic nuclear polarisation (DNP) nuclear magnetic resonance (NMR) spectroscopy | ||
| Solid-state nuclear magnetic resonance (SSNMR) is a versatile and purely non-destructive technique that can provide high-resolution molecular structural information on a large variety of materials, either directly by acquiring the NMR experiments at high magnetic fields or indirectly by taking advantage of multidimensional correlation schemes (or both). Contrary to scattering techniques, SSNMR is perfectly suited for the analysis of powdered samples (i.e. single crystals are not required), and it can access supramolecular structural information without the need of long-range translational order. The Achilles’ heel of NMR, however, remains its low sensitivity that usually precludes analysis of structural details, which are intrinsically associated with NMR signals of low intensity. One of the most promising methods for boosting the SSNMR sensitivity is dynamic nuclear polarisation (DNP), which enhances nuclear magnetisation through the microwave-driven transfer (usually at cryogenic temperatures) of electron spin polarisation to nuclei via exogenous paramagnetic centres. DNP is nowadays attracting renewed attention owing to recent spectacular technological and theoretical developments. This communication will describe recent advances in the field of DNP SSNMR for the characterisation of materials in the solid-state by focusing on organic materials, including organic polymers and pharmaceutical compounds. |