2,2-Diphenyl-1-picrylhydrazyl (DPPH) (99%), tetrabutylammoniumhexafluoro phosphate (TBAHFP) (98%), copper perchlorate (Cu(ClO4)2·6H2O) (98%) and iron perchlorate (Fe(ClO4)3·xH2O) (98%) were purchased from Sigma-Aldrich. Acetonitrile (99.9%) was obtained from Prolabo.
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