Why are coordination compounds like chlorophyll and vitamin B12 essential to life?
Both are metal complexes doing specific jobs.
Both are metal complexes doing specific jobs. Chlorophyll centres a magnesium ion in a porphyrin ring and captures light energy to drive photosynthesis. Vitamin B12 centres a cobalt ion and is vital for making red blood cells and DNA. The metal's coordination environment tunes exactly how it absorbs light or catalyses reactions — showing coordination chemistry is the backbone of many biomolecules.
Key point
Biological function often depends on a metal held in a precise coordination environment (Mg in chlorophyll, Co in B12).
Common mistake
thinking these are simple organic molecules with no metal centre.
Memory tip
life runs on metal complexes: Mg (chlorophyll), Fe (haemoglobin), Co (B12).
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