Magnetic Resonance Study of 4-amino-2,2,6,6-tetramethylpiperidine-N-oxyl and Its Deuterated Derivatives

Article abstract of DOI:10.1016/0022-2364(80)90056-6

4-Amino-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMP-NH2) is a spin label suitable for the investigation of polymer sytems.The analysis of EPR spectra of spin-labeled samples intended for the determination of the type and correlation time of spin-label rotational reorientation in the system under study requires the knowledge of the proton splitting constants, the hyperfine interactions tensor A^N, and the g tensor of thisnitroxide.The splitting constants were determined by the NMR method from differences in the shifts of protons in the spectra of nitroxide and of its diamagnetic analod, 4-amino-2,2,6,6-tetramethylpiperidine. by analyzing the rigid-limit EPR spectrum of 4-acetamino-perdeutero-2,2,6,6-tetramethylpiperidine-N-oxyl recorded in CD3OD, we determined the tensors A^N and g in this solvent