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. Author manuscript; available in PMC: 2010 Oct 14.
Published in final edited form as: J Am Chem Soc. 2009 Oct 14;131(40):14508–14520. doi: 10.1021/ja906137y

Table 4.

Spectroscopic Parameters for Peroxo Intermediates in Non-Heme Diiron Enzymes and Synthetic Oxo-Bridged Diiron(III) Compounds.

Optical Mössbauer
γmax (nm) ε (M−1cm−1) δ (mm/s) ΔEQ (mm/s) Ref.
sMMOH (M. caps. (Bath)) 700 1800 0.66 1.51 a
ToMOH (Pseudomonas sp. OX1) - - 0.54 0.66 65
ToMOH T201S (Pseudomonas sp. OX1) 675 1500 0.67 1.51 20
RNR-R2 D84E 700 1500 0.63 1.58 a
Δ9-desaturase 700 1200 0.68 1.90 a
[Fe2(μ-O)(μ-1,2-O2)(6-Me3-TPA)2]2+ 494; 648c 1100; 1200 0.54 1.68 66
[Fe2(μ-O)(μ-1.2-O2)(μ-O2CR)(hexpy)2]+ 510; 605c 1300; 1310 0.53 1.67 68
[Fe2(μ-O)(μ-1,2-O2)(6-Me2-BPP)2] 577 1500 0.50 1.46 67
[Fe2(μ-O)(μ-O2)BPG2DEV] 490 1500 0.58 0.58 b
a

Parameters were taken from ref. 1.

b

This work.

c

peroxo-Fe(III) charge transfer band.