Figure 8. Gouterman’s model for porphyrin

From

An Undergraduate Experiment Using Microwave-Assisted Synthesis of First Raw Metalloporphyrins: Characterizations and Spectroscopic Study

Muna Bufaroosha, Shaikha S. Al Neyadi, Mohamed A.R. Alnaqbi, Sayed A.M. Marzouk, Abdullah Al-Hemyari, Bashar Yousef Abuhattab, Dana Akram Adi

World Journal of Chemical Education. 2019, 7(3), 225-231 doi:10.12691/wjce-7-3-6