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. 2019 Apr 11;7:177. doi: 10.3389/fchem.2019.00177

Figure 2.

Figure 2

(A) meso and β-pyrrolic positions in porphine; (B) UV-Vis spectrum of H2-tetraphenylporphyrin and ZnII-tetraphenylporphyrin in THF solution; (C) HOMO and LUMO orbitals according to the four orbital model of Gouterman.