期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 33, 页码 7486-7491出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202001084
关键词
BDPA; dynamic nuclear polarization; EPR spectroscopy; radical stability; radicals
资金
- Icelandic Research Fund [163393-052]
- Icelandic Centre for Research (Rannis)
1,3-Bis(diphenylene)-2-phenylallyl (BDPA)-based radicals are of interest as polarizing agents for dynamic nuclear polarization (DNP). For this purpose, a BDPA-nitroxide biradical, employing a phosphodiester linkage, was synthesized. Contrary to what is commonly assumed, BDPA-derived radicals were observed to have limited stability. Hence, the effects of various factors on the stability of BDPA radicals were investigated. Solvent polarity was found to play a significant role on degradation; a polar BDPA radical was observed to degrade faster in a non-polar solvent, whereas non-polar radicals were more unstable in polar solvents. The rate of decomposition was found to increase non-linearly with increasing radical concentration; a 2-fold increase in concentration led to a 3-fold increase in the rate of degradation. Collectively, these results indicate that the dimerization is a significant degradation pathway for BDPA radicals and indeed, a dimer of one BDPA radical was detected by mass spectrometry.
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