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. Author manuscript; available in PMC: 2014 Jan 15.
Published in final edited form as: Coord Chem Rev. 2012 Jun 6;257(2):511–527. doi: 10.1016/j.ccr.2012.05.008

Figure 10.

Figure 10

HOMO-6 can account for the selective shift to higher νCO when a lone pair donor interacts with ONO of Fe(III)NO heme adducts. The interaction pushes electron density out of the NO π* orbital and onto the porphyrin, strengthening the NO bond, with little effect on the Fe-NO bond.