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. Author manuscript; available in PMC: 2017 Dec 7.
Published in final edited form as: Nanophotonics. 2017 Aug 1;6(5):853–879. doi: 10.1515/nanoph-2016-0189

Figure 4. Tetrapyrrole absorption spectra showing porphyrins, chlorins, bacteriochlorins, and phthalocyanines.

Figure 4

As pyrrole-ring double bonds are successively reduced starting in porphyrins and going to chlorins and bacteriochlorins, the Q-band moves to longer wavelengths and increases in size.