Abstract
The present studies are concerned with the influence of the nature of the solvent on the time-dependent stability of the absorption maxima of the free radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) at 520 nm as well as the intensity of its EPR spectrum. The correlation between these two characteristics of DPPH, the behaviour of which is found to be unpredictably strange, unambiguously shows that the problem for calibration of DPPH in order to be used as a primary standard for quantitative EPR spectrometry purpose is not solved yet. This problem needs additional studies in order to find exact methods for examination of the data concerning DPPH quantitative characteristics before its use.
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Yordanov, N.D., Christova, A. DPPH as a primary standard for quantitative EPR spectrometry. Appl. Magn. Reson. 6, 341–345 (1994). https://doi.org/10.1007/BF03162498
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DOI: https://doi.org/10.1007/BF03162498