title: Dynamic nuclear polarization with a rigid biradical.
abstract: 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.
authors.affiliation: Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: Yoh
authors.initials: Y
authors.lastname: Matsuki
authors.forename: Thorsten
authors.initials: T
authors.lastname: Maly
authors.forename: Olivier
authors.initials: O
authors.lastname: Ouari
authors.forename: Hakim
authors.initials: H
authors.lastname: Karoui
authors.forename: François
authors.initials: F
authors.lastname: Le Moigne
authors.forename: Egon
authors.initials: E
authors.lastname: Rizzato
authors.forename: Sevdalina
authors.initials: S
authors.lastname: Lyubenova
authors.forename: Judith
authors.initials: J
authors.lastname: Herzfeld
authors.forename: Thomas
authors.initials: T
authors.lastname: Prisner
authors.forename: Paul
authors.initials: P
authors.lastname: Tordo
authors.forename: Robert G
authors.initials: RG
authors.lastname: Griffin
mesh_terms: 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*
chemical_list: D003497:Cyclic N-Oxides; D005609:Free Radicals; D013141:Spiro Compounds; C543204:bis-TEMPO-bisketal; C003959:TEMPO