title: Relaxation rates for spirocyclohexyl nitroxyl radicals are suitable for interspin distance measurements at temperatures up to about 125 K.
abstract: Between 65 and 175 K, nitroxyl radicals with spirocyclohexyl groups at the 2- and 6-positions of the piperidine ring exhibit spin echo dephasing rates that are slower than for nitroxyl radicals with 2,5-gem-dimethyl or 2,6-gem-dimethyl substituents that are currently used as spin labels, and are slow enough to permit DEER measurements at temperatures up to about 125 K for spin labels with analogous ring structures.
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado, 80208, USA.
authors.forename: Velavan
authors.initials: V
authors.lastname: Kathirvelu
authors.forename: Christopher
authors.initials: C
authors.lastname: Smith
authors.forename: Christopher
authors.initials: C
authors.lastname: Parks
authors.forename: Md Abdul
authors.initials: MA
authors.lastname: Mannan
authors.forename: Yozo
authors.initials: Y
authors.lastname: Miura
authors.forename: Keizo
authors.initials: K
authors.lastname: Takeshita
authors.forename: Sandra S
authors.initials: SS
authors.lastname: Eaton
authors.forename: Gareth R
authors.initials: GR
authors.lastname: Eaton
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000737:chemistry*; D009589:Nitrogen Oxides / Q000737:chemistry*; D013696:Temperature
chemical_list: D005609:Free Radicals; D009589:Nitrogen Oxides; C039900:nitroxyl