Abstract
Abstract The stable dodecameric oxy form of Carcinus aestuarii hemocyanin (Cae oxy-Hc) has been probed by resonance Raman, UV–vis, and CD spectroscopy. A clear signal emerged at 746 cm−1 (Raman) sensitive to isotopic exchange with 18O2 (−40 cm−1), thus confirming the presence of a μ-η2:η2 peroxide coordinated to the cupric centers. The optical fingerprints of Cae oxy-Hc show that symmetry breaking exists at the Cu(II)–O22−–Cu(II) core and that exciton coupling effects are present in the visible region of the spectra.
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