Acta Cryst. (2001). E57, o786-o787  [ doi:10.1107/S1600536801010716 ]

An isoindoline EPR label: 5-acetamido-1,1,3,3-tetramethylisoindolin-2-yloxyl

G. Smith, S. E. Bottle, D. A. Reid and R. C. Bott

Abstract: The crystal structure of the isoindoline nitroxide amide 5-acetamido-1,1,3,3-tetramethylisoindolin-2-yloxyl, C₁₄H₁₉N₂O₂, which has utility as an EPR label, shows a characteristically stable tetramethyl-substituted nitroxide ring system which is essentially coplanar with the amide side-chain substituent. A single intermolecular hydrogen bond between the amide H atom and the nitroxide O atom links the molecules head-to-tail into an infinite polymeric chain.

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