Synthesis, Isomer Count, and Nuclear Spin Relaxation of H2O@Open-C-60 Nitroxide Derivatives

[摘要]：H2O@C-60 derivatives covalently linked to a nitroxide radical were synthesized. The H-1 NMR of the guest H2O revealed the formation of many isomers with broad signals. Reduction to the diamagnetic hydroxylamines sharpened the H-1 NMR signals considerably and allowed for an "isomer count" based on the number of observed distinct signals. For H2O@ K-8, 17 positional isomeric nitroxides are predicted, not including additional numbers of regioisomers; indeed, 17 signals are observed in the H-1 NMR spectrum.

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