One is the oxygen ligand near ion T2 in the channel, one is in the center of the copper ions triangle, and one is between two copper ions T3. In the native intermediate (NI) state, all three copper ions are oxidized to charge +2e, and there are three oxygen ligands involved. The T2 and one of the T3 copper ions are oxidized to Cu(II), and there is an oxygen ligand near the T2 copper ion. The peroxy intermediate (PI) state includes deprotonated hydrogen peroxide located inside the copper ion triangle. In the fully reduced state of the TNC, all three copper ions are reduced to charge +1e and two oxygen ligands are involved (one between two T3 copper ions outside TNC, and the other one near the T2 copper ion in channel T2). Among the TNC states at the oxygen reduction, the following ones can be distinguished. It includes a couple of two-electron reduction stages.
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