Coordination Chemistry

This is an example of a chelator; "Heme" found in hemoglobin. As some of you may know, hemoblogin found in red blood cell is responsible for binding O2 for respiration. Notice the central Fe2+ ion is chelated by four Nitrogen atoms (four-coordinate square planar configuration). The whole molecule is approximately planar!

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Feb., 2000, Nikita Matsunaga