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Extra credit. Extra credit 1 – ionic radii trends Extra credit 2 – solving MIMT single crystal structures Work on these must be completed individually . Due date: May 14 th. Exploring biological functionality. Enzymes Complex systems that often contain metals at active site

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extra credit
Extra credit
  • Extra credit 1 – ionic radii trends
  • Extra credit 2 – solving MIMT single crystal structures
  • Work on these must be completedindividually.
  • Due date: May 14th
exploring biological functionality
Exploring biological functionality
  • Enzymes
    • Complex systems that often contain metals at active site
    • Metals are particularly import for redox enzymes
  • Bio-inorganic chemistry
    • Synthesis of model compounds
slide4

Nitrogenase

Nitrogenase consists of 2 proteins: dinitrogenase reductase and dinitrogenase

Overall reaction

dinitrogenase

reductase

dinitrogenase

16 ATP required for each reduction of N2 -> 2 NH3

slide5

Some bacteria fix nitrogen only when involved in a

symbiotic relationship with plants

slide6

Leghemoglobin protects nitrogenase by binding oxygen

A true cross-species collaboration:

Plant makes the globin protein and bacterium makes the heme cofactor

industrial haber process n 2 nh 3
Industrial Haber process (N2 -> NH3)

T = 400-500 °C

p = 300-1000 atm

you will make model compound co salen
You will make model compound, Co(salen)
  • Co(salen) can bind oxygen, just like the biological heme molecule
oxygen binding depends on co environment
Oxygen binding depends on Co environment
  • In crystals:
  • Solvated:
  • Co(salen) exists with Co in a 4, 5, or 6 coordinate site
  • Solvated Co(salen) only binds O2 when it is 5 or 6 coordinate