Table 2. Vibration frequencies of metal superoxo and hydroperoxo species, for comparison with the Raman data for intermediates 2–4.
| Complexes | v(O-O) | v(M-O) | Ref. |
|---|---|---|---|
| 2 | 1,310 (-71) | — | This work |
| Fe(phthalocyan)O2 | 1,207 (-63) | 488 (-22) | 31 |
| Hemoglobin/O2 | 1,107 (-42) | 571 (-31) | 6 |
| Myoglobin/O2 | 1,103 (-38) | 572 | 6 |
| Synthetic heme/O2 complexes | 1,104-1,195 | 509-575 | 6 |
| Cu(L)O2 (L = N4, N3O) | 1,117-1,122 | — | 12-15 |
| Cu(TptBu,iPr)O2 | 1,112 (-52) | — | 9 |
| Cu(TpAd,iPr)O2 | 1,043 (-59) | — | 11 |
| Cu(2,6-Pr2NN)O2 | 968 (-51) | — | 10 |
| 3 | 831 (-47) | 483 (-20) | This work |
| OxyHr (FeIII-O-FeIIIOOH) | 844 (-48) | 503 (-24) | 32 |
| Fe2(μ-O)(μ-Ph4DBA)(TMEDA)2(OOH) | 843 (-46) | — | 33 |
| Fe2(BEPEAN)(μ-O)(OOH) | 868 (-40) | — | 34 |
| [Fe(H2BPPA)(OOH)]2+ | 830 (-17) | 621 (-22) | 35 |
| 4 | 848 (-46) | 530 (-20), 462 (-21) | 21 |
TptBu,iPr, hydrotris(3-tert-butyl-5-isopropyl-1-pyrazolyl)borate; TpAd,iPr, hydrotris(3-adamantyl-5-isopropyl-1-pyrazolyl)borate; 2,6-Pr2NN,2-(2,6-diisopropylphenyl)-aminopent-2-en-4-(2,6-diisopropylphenyl)imine anion; oxyHr, oxyhemerythrin; Ph4DBA, dibenzofuran-4,6-bis(diphenylacetate); TMEDA, N,N,N′,N′-tetramethylethyl-enediamine; BEPEAN, 2,7-bis(bis(2-(2-pyridyl)ethyl)aminomethyl)-1,8-naphthyridine; H2BPPA, bis(6-pivalamido-2-pyridylmethyl)-2-pyridylmethylamine.