When I search for catalysts other than chlorophyll on Google, I only get references to artificial photosynthesis. When I look up photosynthesis, I see accessory pigments mentioned, but it appears that the chlorophyll family is crucial.
These chlorophyll variants all have the chlorin (not to be confused with chlorine) ring in common.
Are there any photosynthetic organisms that do not use a chlorin derivative? Why is chlorin so predominant?