1980
DOI: 10.1021/ja00526a022
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Axial ligation constants of iron(II) and cobalt(II) "capped" porphyrins

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Cited by 91 publications
(39 citation statements)
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“…The unique Raman features of these pseudo-six-coordinate complexes are in harmony with speculations that the second base ligand is bound to the iron center in a nonaxial manner to a dyz or dxz orbital of the metal (8,9). The larger cap structure of Fe(HmCap) than that of Fe(Cap) (Fig.…”
Section: Methodssupporting
confidence: 77%
“…The unique Raman features of these pseudo-six-coordinate complexes are in harmony with speculations that the second base ligand is bound to the iron center in a nonaxial manner to a dyz or dxz orbital of the metal (8,9). The larger cap structure of Fe(HmCap) than that of Fe(Cap) (Fig.…”
Section: Methodssupporting
confidence: 77%
“…2). These results maybe explained in the context ofa reaction scheme that is extended to include the seven-coordinate complex, Fe(C3-Cap)(B)5(CO), which is observed.in equilibrium studies (18). imoto and Basolo (30) that steric effects exhibit a cut-off value in the number of atoms in the straps linking the aromatic cap to the flat porphyrin: if there are n = 7 or more atoms in the strap, the model compound is not likely to provide any measurable stenic hindrance to the approaching: CO molecule.…”
mentioning
confidence: 72%
“…Thus, addition of a sterically hindered axial base, such as 1,2-dimethylimidazole (1,2-DiMeIm) [28], favors formation of a five-coordinate high-spin complex with the Fe II center displaced out of the heme plane (a model for T-state Hb). Covalent attachment of the axial ligand to the heme [29] or steric hindrance of one of the two faces of the heme [30] [31] are other approaches to prevent hemochrome formation. Rapid decomposition of the O 2 adducts via m-oxo-dimer formation is usually prevented by attachment of bulky substituents onto the iron(II) porphyrin as in the −picket fence× systems [15] or by bridging the macrocycle [31] [32].…”
mentioning
confidence: 99%