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  • Title: Relaxation rates for spirocyclohexyl nitroxyl radicals are suitable for interspin distance measurements at temperatures up to about 125 K.
    Author: Kathirvelu V, Smith C, Parks C, Mannan MA, Miura Y, Takeshita K, Eaton SS, Eaton GR.
    Journal: Chem Commun (Camb); 2009 Jan 28; (4):454-6. PubMed ID: 19137183.
    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.
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