646034-07-3Relevant academic research and scientific papers
Synthesis, electrochemical and spectroelectrochemical characterization of iron(III) tetraarylporphyrins containing four β, β ′-butano and β, β ′-benzo fused rings
Xu, Weijie,Fang, Yuanyuan,Ou, Zhongping,Chen, Mingyuan,Kadish, Karl M.
, p. 521 - 534 (2018/05/14)
Six iron(III) tetraarylporphyrins containing four b,b?-butano or b,b?-benzo fused rings were synthesized and characterized by electrochemistry and spectroelectrochemistry in nonaqueous media. The examined compounds are represented as butano(TpYPP)FeCl and
Low-Spin Ferriheme Models of the Cytochromes: Correlation of Molecular Structure with EPR Spectral Type
Yatsunyk, Liliya A.,Carducci, Michael D.,Walker, F. Ann
, p. 15986 - 16005 (2007/10/03)
The preparation and characterization of the following bis-imidazole and bis-pyridine complexes of octamethyltetraphenylporphyrinatoiron(III), Fe(III)OMTPP, octaethyltetraphenylporphyrinatoiron(III), Fe(III)OETPP, and tetra-β,β′-tetramethylenetetraphenylporphyrinatoiron(III), Fe(III)TC6TPP, are reported: paral-[FeOMTPP(1-Melm)2]Cl, perp-[FeOMTPP(1-Melm)2]Cl, [FeOETPP(1-Melm)2]Cl, [FeTC6TPP(1-Melm)2]Cl, [FeOMTPP(4-Me2NPy) 2]Cl, and [FeOMTPP(2-MeHlm)2]Cl. Crystal structure analysis shows that paral-[FeOMTPP(1-Melm)2]Cl has its axial ligands in close to parallel orientation (the actual dihedral angle between the planes of the imidazole ligands is 19.5°), while perp-[FeOMTPP(1-Melm) 2]Cl has the axial imidazole ligand planes oriented at 90° to each other and 29° away from the closest Np-Fe-Np axis. [FeOETPP(1-Melm)2]Cl has its axial ligands close to perpendicular orientation (the actual dihedral angle between the planes of the imidazole ligands is 73.1°). In all three cases the porphyrin core adopts relatively purely saddled geometry. The [FeTC6TPP(1-Melm) 2]Cl complex is the most planar and has the highest contribution of a ruffled component in the overall saddled structure compared to all other complexes in this study. The estimated numerical contribution of saddled and ruffled components is 0.68:0.32, respectively. Axial ligand planes are perpendicular to each other and 15.3° away from the closest N p-Fe-Np axis. The Fe-Np bond is the longest in the series of octaalkyltetraphenylporphyrinatoiron(III) complexes due to [FeTC6TPP(1-Melm)2]Cl having the least distorted porphyrin core. In addition to these three complexes, two crystalline forms each of [FeOMTPP(4-Me2NPy)2]Cl and [FeOMTPP(2-MeHlm) 2]Cl were obtained. In all four of these cases the axial planes are in nearly perpendicular planes in spite of quite different geometries of the porphyrin cores (from purely saddled to saddled with 30% ruffling). The EPR spectral type correlates with the geometry of the OMTPP, OETPP and TC 6TPP complexes. For the paral-[FeOMTPP(1-Melm)2]Cl, a rhombic signal with g1 = 1.54, g2 = 2.51, and g 3 = 2.71 is consistent with nearly parallel axial ligand orientation. For all other complexes of this study, large gmax signals are observed (gmax = 3.61 - 3.27), as are observed for nearly perpendicular ligand plane arrangement. On the basis of this and previous work, the change from large gmax to normal rhombic EPR signal occurs between axial ligand plane dihedral angles of 70° and 30°.
