Fig. 5. UV-vis spectra of the Fe^IIITPPS/Cu^IITerpyCD₂ (green) and its reduced Fe^IITPPS/Cu^ITerpyCD₂ complexes in the deoxy (black), oxy (blue) and CO (red) forms in 0.05 M phosphate buffer at pH 7.0 and 25 °C. The inset shows the resonance Raman spectra of the Fe^IITPPS/Cu^ITerpyCD₂ complexes obtained by excitation at 405 nm under ¹⁶O₂ atmosphere (black), ¹⁸O₂ atmosphere (red), and the difference ¹⁶O₂–¹⁸O₂ (blue). Conditions: 0.05 M phosphate buffer at pH 7.0, 77 K (frozen solution).