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. Author manuscript; available in PMC: 2021 Jul 15.
Published in final edited form as: J Am Chem Soc. 2020 Jun 29;142(28):12349ā€“12356. doi: 10.1021/jacs.0c04626

Figure 5. Pourbaix-type diagram for azine (2)/benzophenone imine (1), N2/NH3/N2H4 species, and redox potentials for the three electrochemical processes for azine synthesis.

Figure 5

Potentials for processes (gray lines) involving N2 can be found in ref. 17. The blue line is the thermodynamics of azine 2 and imine 1 equilibrium. Green squares correspond to the PCET potentials with different buffer solutions: 5 mM 1 in CH3CN (10 mL) with nBu4NPF6 (0.1 M). Red triangles correspond to I 2/I3āˆ’ potentials with different buffer solutions: 5 mM nBu4NI in CH3CN (10 mL) with 50 mM 1 and nBu4NPF6 (0.1 M). Purple diamonds correspond to the relevant CuII/I potentials with different buffer solutions: 5 mM [Cu(CH3CN)4]PF6 in CH3CN (10 mL) with 100 mM 1 and nBu4NPF6 (0.1 M). All the CV studies were performed with glassy carbon as working electrode (~ 7.0 mm2) and a platinum wire (1.0 cm, spiral wire) as counter electrode, scan rate = 20 mV/s.