Quantitative EPR

From NMR Wiki

TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidinyloxy) dissolved in water was proposed[1] as a primary standard for determination of concentration of free radical species by EPR. Concentraion of TEMPOL standard solutions can be determined by measurement of absorbance at 436.68 nm and using molar absorptivity of 13.2±0.1 LM^-1cm^-1.

References

1. Yordanov, ND and Ranguelova, K. Quantitative electron paramagnetic resonance and spectrophotometric determination of the free radical 4-hydroxy-2, 2, 6, 6-tetramethylpiperidinyloxy. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 56(2):373--378, 2000. BibTeX [yordanov]