Abstract
In the further development and understanding of heme-copper dioxygen reactivity relevant to cytochrome c oxidase O2-reduction chemistry, we describe a high-spin, five-coordinate dioxygen (peroxo) adduct of an iron(II)-copper(I) complex, [(6L)FeIICuI](BArF20) (1), where 6L is a tetraarylporphyrinate with a tethered tris(2-pyridylmethyl)amine chelate for copper. Reaction of 1 with O2 in MeCN affords a remarkably stable [t1/2 (rt; MeCN)≈60 min] adduct, [(6L)FeIII-(O22-)-CuII]+ (2) [EPR silent; λmax=418 (Soret), 561 nm], formulated as a peroxo complex based on manometry (1:O2=1:1; spectrophotometric titration, −40 °C, MeCN), mass spectrometry {MALDI-TOF-MS: 16O2, m/z 1191 ([(6L)FeIII-(16O22−)-CuII]+); 18O2, m/z 1195}, and resonance Raman spectroscopy (ν(O-O)=788 cm–1; Δ16O2/18O2=44 cm–1; Δ16O2/16/18O2=22 cm–1). 1H and 2H NMR spectroscopy (−40 °C, MeCN) reveals that 2 is the first heme-copper peroxo complex which is high-spin, with downfield-shifted pyrrole resonances (δpyrrole=75 ppm, s, br) and upfield shifted peaks at δ= −22, −35, and −40 ppm, similar to the pattern observed for the μ-oxo complex [(6L)FeIII-O-CuII](BArF) (3) (known S=2 system, antiferromagnetically coupled high-spin FeIII and CuII). The corresponding magnetic moment measurement (Evans method, CD3CN, −40 °C) also confirms the S=2 spin state, with μB=4.9. Structural insights were obtained from X-ray absorption spectroscopy, showing Fe–O (1.83 Å) and Cu–O (1.882 Å) bonds, and an Fe...Cu distance of 3.35(2) Å, suggestive of a μ-1,2-peroxo ligand present in 2. The reaction of 2 with cobaltocene gives 3, differing from the observed full reduction seen with other heme-Cu peroxo complexes. Finally, thermal decomposition of 2 yields 3, with concomitant release of 0.5 mol O2 per mol 2, as confirmed quantitatively by an alkaline pyrogallol dioxygen scavenging solution.
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Notes
Extremely minor differences exist between the two structures of complex 3. These are due to the use of different counterions and solvent systems employed for crystallization. Here, we crystallized 3 after direct reaction with dioxygen, employing the BarF20– anion [i.e., B(C6F5)4–] and an MeCN/toluene solvent system, yielding [(6L)FeIII-O-CuII][B(C6F5)4]·3toluene. Previously, 3 was formed from an acid–base assembly reaction using a THF/heptane solvent system and employing the (so-called) BArF– anion, yielding [(6L)FeIII-O-CuII][B(C8H3F6)4], with 4–8 disordered heptane molecules (and perhaps some THF) which were not located, but inferred by refinement with PLATON/SQUEEZE. That structure gave Fe–O=1.750(4), Cu–O=1.848(4), and Fe...Cu=3.586 distances (Å), and ∠Fe–O–Cu of 171.1(3)°
As a general feature of MALDI-TOF mass spectrometry, the lack of peak resolution leads to the observed mass numbers being the averaged one of the cluster peaks, different from the base peak. This leads to systematic deviations in the observed peak from the calculated values. For example, an ion of the reduced form [1−BArF20]+ should give the following isotope distribution: m/z 1155 (rel int 6%), 1156 (4), 1157 (100), 1158 (76), 1159 (71), 1160 (40), 1161 (14), 1162 (2). However, we observe one unresolved peak and its peak maximum was m/z=1159. In a similar way, the 16O2 and 18O2 adducts derived from 2 should give the base peaks at m/z=1189 and 1193, respectively. However, the observed data yielded peaks at m/z=1191.5 and 1195.6, respectively. The decomposition product 3 is calculated to give m/z=1173 (16O) and 1175 (18O); observed, 1174.9 and 1177.1 The systematic differences from the calculated values by ~2 mass units could come from the lack of accuracy and peak resolution on the applied mass spectrometric measurement, and we thank a reviewer for bringing this to our attention
See footnote 2
ν(Fe–16OH) (Δ16O/18O) for (6L)FeIII-OH and (F8TPP)FeIII-OH are 636 cm−1 (−29) and 638 cm−1 (−29), respectively (MeCN, rt, 442 nm excitation); unpublished results
The more distant O(peroxide) atom (that bound to Cu) is not resolvable in the EXAFS becasue it is a low Z scatterer and will be obscured also by 2nd shell carbons of the porphyrin ring
This intermediate was ruled out when mass spectrometric analysis of the headspace gas revealed no mixed-isotope dioxygen gas was evolved upon the decomposition of a mixture of 16O2 and 18O2 μ-peroxo adducts
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Acknowledgements
We are grateful to the National Institutes of Health (K.D.K., GM60353; R.J.C., GM54882; P.M.-L., GM18865) for support of this research.
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Ghiladi, R.A., Huang, Hw., Moënne-Loccoz, P. et al. Heme-copper/dioxygen adduct formation relevant to cytochrome c oxidase: spectroscopic characterization of [(6L)FeIII-(O22−)-CuII]+. J Biol Inorg Chem 10, 63–77 (2005). https://doi.org/10.1007/s00775-004-0609-1
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DOI: https://doi.org/10.1007/s00775-004-0609-1