Resonance Raman spectroscopic detection of steric-induced distortions of axial ligand binding for dioxygen adducts of superstructured cobalt-porphyrin complexes

A hydrogen bond scaffold supported synthetic heme FeIII–O2− adduct

“…Note that in many heme enzymes the O-O vibration is coupled to the heme modes. 18 (Fig. S3 and S4, ESIw) where the ester groups of the a 4 -Fe(COOMe) 4 complex is replaced by ferrocene groups.…”

“…rR data in the 900-1000 cm À1 region show bands at 1004 cm À1 and 967 cm À1 which shift to 951 cm À1 and 911 cm À1 , respectively, on 18 O 2 substitution (Fig. 3C, blue to green and the difference spectrum in black).…”

“…3B, blue) which shifts to 559 cm À1 (Fig. 3B, green) on substituting with 18 O 2 . Thus, in conjunction with the EPR data and the n 4 and n 2 bands in the rR spectra, the observation of the Fe-O vibration at 581 cm À1 is consistent with the formation of an end-on S = 0 Fe-O 2 adduct.…”

Laser Raman Spectroscopic Studies on Hemeproteins in Epileptic Children

“…et al [54]. The polarized line at 1370 cm −1 has been considered by so many investigatiors [55][56][57] as an ate marker. It has been supported by the researchers that the frequency for ferric hemoproteins (1370 cm −1 to 1380 cm −1 ) is higher than the ferrous states i.e.…”

“…1355 cm −1 to 1365 cm −1 . It was suggested by [55,56] that oxy hemoglobin contained an Fe(III) (low spin) O 2 complexes. It has been seen that perhaps the polarized line at 1370 cm −1 indicates the extent of π back donation, but not the total charge on the iron [54].…”