1984
DOI: 10.1021/ja00329a054
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Resonance Raman study of the .mu.-oxo-bridged binuclear iron center in oxyhemerythrin

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Cited by 105 publications
(93 citation statements)
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“…Indeed, the vibrational features of 3 are quite similar to those of oxyhemerythrin and its models (Table 2) (33)(34)(35). However, unlike for oxyhemerythrin (37,51), direct spectroscopic evidence for the proposed Fe-1 -OOH mode could not be obtained for 3.…”
Section: Discussionmentioning
confidence: 83%
“…Indeed, the vibrational features of 3 are quite similar to those of oxyhemerythrin and its models (Table 2) (33)(34)(35). However, unlike for oxyhemerythrin (37,51), direct spectroscopic evidence for the proposed Fe-1 -OOH mode could not be obtained for 3.…”
Section: Discussionmentioning
confidence: 83%
“…A hydrogen bond in this location could contribute to the differences in dioxygen and azide binding observed. A similar proposal has been made to account for deuterium isotope effects and the Fe-O-Fe vibration frequencies in the resonance Raman spectrum of oxyhemerythrin (10).…”
Section: Resultsmentioning
confidence: 90%
“…The absence of a distinct visible absorption spectrum for deoxyhemerythrin has hampered spectroscopic investigations of the Fe complex in this form of the protein. (9,10), polarized absorption spectroscopy (11), and x-ray absorption spectroscopy (12) indicate that the metal complex in oxyhemerythrin is similar to that in azidomethemerythrin, where the two Fe(III) atoms are bridged by a A-oxygen atom, and the exogenous ligand binds only to one Fe atom. The x-ray crystallographic results reported here support this description for oxyhemerythrin and, in addition, suggest some rearrangement in the binuclear iron complex upon conversion from deoxy to oxy.…”
mentioning
confidence: 98%
“…While this idea is clear in principle, its utility in practice has been limited: isotopomer peak splitting has only rarely been reported with certainty. The ''classic'' example is oxyhemerythrin, where mixed-isotope peaks were not resolved, but deconvolution of a flattened, broadened absorption band led to an assignment of isotopomeric absorptions separated by 5 cm À1 and having widths at half height of 5.5 cm À1 [20,21] (the O 2 fragment in this case is protonated, i.e., it is a hydroperoxo ligand [22], although this was not known at the time of the original experiment). In other examples, cobalt(tetramesitylporphine)superoxide 3 has been assigned [23] to exhibit a separation between isotopomers of about 11 cm À1 in m(O-O) (the splitting is approximate since both O-O stretching bands are observed as shoulders on a porphyrin absorption) and a broad mixed-isotope band for Pd(O 2 )(t-BuNC) 2 in an oxygen matrix has been resolved into two peaks separated by 4-5 cm À1 [24].…”
Section: Introductionmentioning
confidence: 99%