L-edge X-ray absorption spectroscopy and DFT calculations on Cu2O2 species: direct electrophilic aromatic attack by side-on peroxo bridged dicopper(II) complexes. - Qayyum MF; Sarangi R; Fujisawa K; Stack TD; Karlin KD; Hodgson KO; Hedman B; Solomon EI (Journal of the American Chemical Society, 2013)