Complex formation between porphyrins and metal ions.
D002614:Chelating Agents; D055598:Chemical Phenomena; D002621:Chemistry; D003035:Cobalt; D003300:Copper; D007501:Iron; D008670:Metals; D011166:Porphyrins; D013053:Spectrophotometry; D014001:Tin
D002614:Chelating Agents; D008670:Metals; D011166:Porphyrins; D003035:Cobalt; D014001:Tin; D003300:Copper; D007501:Iron