Methods of synthesising stable 2-imidazoline nitroxides linked to a pyrazole moiety either directly or through a phenylethynylic
bridge have been developed; an unusually strong temperature dependence of μeff for 2-(1-methylpyrazolyl-5)-4,4,5,5-tetramethyl-
1-oxyl-2-imidazoline-3-oxide is observed.
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