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. Author manuscript; available in PMC: 2017 Aug 10.
Published in final edited form as: Chem Rev. 2016 Jun 29;116(15):8693–8749. doi: 10.1021/acs.chemrev.6b00180

Figure 5.

Figure 5

Fe(η2-H2) complexes in the laboratory (top left and right) and in Nature (bottom). Note the presence of five strong-field ligands that serve to support the low-spin Fe(II) electrophile.