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. Author manuscript; available in PMC: 2008 Sep 1.
Published in final edited form as: J Am Chem Soc. 2007 Feb 2;129(8):2210–2211. doi: 10.1021/ja067562o

Figure 2.

Figure 2

Refined values of Δf″ for Fd4. The asymmetric unit contains two monomers and the iron sulfur clusters in monomers A (Fe1 (◇) and Fe2 (◆) and B (Fe3 (○) and Fe4 (●)) show consistent differences between their iron atoms. A fluorescence scan taken from the same crystal before data collection is shown in grey. All sulfur (△) and cadmium (▽) atoms in the structure were each refined as a single anomalous species; the refined values of ~4.4 and 0.5 electrons may be compared to tabulated values of 5.7 and 0.7 e−, respectively.4 The insert shows the refined Δf′ values, where Fe2 and Fe4 yield a curve with two minima.