Thursday, 14 June 2012

notes from Fantuzzi's lectures on axial ligands and reduction potential

By changing the axial ligands (ligands 5 and 6, above and below the planar ring) you change the reduction potential of Fe3+. His and Cys reduce the reduction potential, making it more difficult to add an electron to the Fe3+, because their electron-rich side chains effectively shield the 'want' of the Fe3+ to gain an electron....

When there is a group nearby that causes electrons to be pushed through the His ligands towards the Fe3+, it shields the 'want' of the Fe3+ to gain an electron.

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