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=Mg

=C

=O

=H

=N

=Fe

=C

=O

=H

=N

chlorophyll a

Plants appear green because chlorophyll a absorbs red and purple light; the reflected light consequently appears green. The geometry around the Mg ion is square planar.

Heme

Heme is the iron-containing complex in hemoglobin. In hemoglobin, the red heme complex is bonded to a large protein molecule (globin) by coordination of the protein to a position above the plane of the heme molecule. The geometry around the Fe ion is square planar.

= Co

= C

= O

= H

= N

= P

vitamin B12 Vitamin B12 is one of the essential vitamins required for living organisms. Note the octahedral structure around the Co atom.

A great deal of help in compiling this and many of the Chime images came from http://www.chem.purdue.edu/gchelp/cchem/ Additional Chime images from http://www.rcsb.org/pdb/

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