Dynamic nuclear polarization with a rigid biradical.
A new polarizing agent with superior performance in dynamic nuclear polarization experiments is introduced, and utilizes two TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) moieties connected through a rigid spiro tether (see structure). The observed NMR signal intensities were enhanced by a factor of 1.4 compared to those of TOTAPOL, a previously described TEMPO-based biradical with a flexible tether.
Matsuki
Yoh
Y
Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Maly
Thorsten
T
Ouari
Olivier
O
Karoui
Hakim
H
Le Moigne
François
F
Rizzato
Egon
E
Lyubenova
Sevdalina
S
Herzfeld
Judith
J
Prisner
Thomas
T
Tordo
Paul
P
Griffin
Robert G
RG
D003497:Cyclic N-Oxides / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D013141:Spiro Compounds / Q000737:chemistry*
D003497:Cyclic N-Oxides; D005609:Free Radicals; D013141:Spiro Compounds; C543204:bis-TEMPO-bisketal; C003959:TEMPO