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Publicatii proprii
Axial ligation in water-soluble copper porphyrinates: contrasts between EPR and UV–vis
Copper porphyrinates are generally known to display a less diverse reactivity compared to their iron counterparts. Here, we examine a water-soluble copper porphyrinate for its ability to engage in reactions involving axial ligation to the copper or possible redox cycling. Although UV-vis spectra indicate an expected lack of reactivity, electron paramagnetic resonance spectra (EPR) reveal an unexpected wealth of changes in electronic structures at
Read moreEPR study of superoxide radicals from potassium superoxide
Electron Paramagnetic Resonance (EPR) spectroscopy and the spin trapping technique were employed in order to monitor the superoxide radical liberated from potassium superoxide in aqueous alkaline solutions; DEPMPO (5-diethoxyphosphoryl-5-methyl- 1-pyrroline-N-oxide) was used as a trapping agent. Three reaction systems were prepared, varying the ratios between KO2, superoxide and DEPMPO. The data indicate distinct mechanisms leading to DEPMPO/spin
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