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. Author manuscript; available in PMC: 2012 Nov 23.
Published in final edited form as: J Am Chem Soc. 2011 Oct 28;133(46):18816–18827. doi: 10.1021/ja206152m

Figure 2.

Figure 2

The upper panel compares the electronic absorption spectra of the ferric, ferrous and ferrous CO-bound forms of Ch-CooA at pH 8. The Soret absorption maxima are located at 415, 424 and 421 nm for the respective states. The lower panel displays the normalized time resolved transmittance (ΔT) of the above complexes obtained with pump/probe excitation at 420 nm for ferric and 435 nm for the ferrous and CO bound complexes. The ferric transient response shows a bleaching recovery signal (ΔT > 0). In contrast, the ferrous and CO bound forms show a strong transient absorption signal (ΔT < 0) at 435 nm that indicates ligand photolysis in both cases. The time constants are reported in the text.