Purple and green(Anoxygenic Phototrophic) Bacteria Bacteriochlorophylls Bacteriochlorophylls differ in substituents on various parts of the porphyrin ring; The various modifications lead to changes in the H3C R absorption spectra of the H bacteriochlorophylls H From the long-wavelength maximum. the identification C=o of the bacteriochlorophyll can be madePurple and Green (Anoxygenic Phototrophic) Bacteria Bacteriochlorophylls Bacteriochlorophylls differ in substituents on various parts of the porphyrin ring; The various modifications lead to changes in the absorption spectra of the bacteriochlorophylls; From the long-wavelength maximum, the identification of the bacteriochlorophyll can be made