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Topical Developments in High-Field Dynamic Nuclear Polarization.
- Source :
-
Israel journal of chemistry [Isr J Chem] 2014 Feb; Vol. 54 (1-2), pp. 207-221. Date of Electronic Publication: 2014 Feb 13. - Publication Year :
- 2014
-
Abstract
- We report our recent efforts directed at improving high-field DNP experiments. We investigated a series of thiourea nitroxide radicals and the associated DNP enhancements ranging from ε = 25 to 82 that demonstrate the impact of molecular structure on performance. We directly polarized low-gamma nuclei including <superscript>13</superscript> C, <superscript>2</superscript> H, and <superscript>17</superscript> O using trityl via the cross effect. We discuss a variety of sample preparation techniques for DNP with emphasis on the benefit of methods that do not use a glass-forming cryoprotecting matrix. Lastly, we describe a corrugated waveguide for use in a 700 MHz / 460 GHz DNP system that improves microwave delivery and increases enhancements up to 50%.
Details
- Language :
- English
- ISSN :
- 0021-2148
- Volume :
- 54
- Issue :
- 1-2
- Database :
- MEDLINE
- Journal :
- Israel journal of chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 25977588
- Full Text :
- https://doi.org/10.1002/ijch.201300126