79231-62-2Relevant academic research and scientific papers
Characterization and Subsequent Reactivity of an Fe-Peroxo Porphyrin Generated by Electrochemical Reductive Activation of O2
Oliveira, Raquel,Zouari, Wiem,Herrero, Christian,Banse, Frédéric,Sch?llhorn, Bernd,Fave, Claire,Anxolabéhère-Mallart, Elodie
, p. 12204 - 12210 (2016)
Reductive activation of O2 is achieved by using the [FeIII(F20TPP)Cl] (F20TPP = 5,10,15,20-tetrakis(pentafluorophenyl) porphyrinate) porphyrin through electrochemical reduction of the [FeIII(F20
Reduction of III(tfpp)Cl> by Azaferrocene. The Crystal Structure of II(tfpp)2>
Zakrzewski, Janusz,Cesario, Michele,Guilhem, Jean,Giannotti, Charles
, p. 3059 - 3060 (1992)
Azaferrocene reacts with chloroiron(III) to give a low-spin iron(II) porphyrin, II(tfpp)2>, the crystal and molecular structure of which has been determined; while air-stable in the solid state, in solution it loses co-ordinated azaferrocene and (under aerobic conditions) undergoes oxidation to FeIII.
Significantly boosted oxygen electrocatalysis with cooperation between cobalt and iron porphyrins
Lei, Haitao,Zhang, Qingxin,Wang, Yabo,Gao, Yimei,Wang, Yanzhi,Liang, Zuozhong,Zhang, Wei,Cao, Rui
supporting information, p. 5120 - 5123 (2021/04/26)
Developing electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is of great importance. Herein, Co tetrakis(pentafluorophenyl)porphyrin (Co-P) and Fe chloride tetrakis(pentafluorophenyl)porphyrin (Fe-P) were loaded on carbon nanotubes (CNTs) for combining the electrocatalytic advantages of both Co-P and Fe-P. The resultant (Co-P)0.5(Fe-P)0.5@CNT composite displayed significantly boosted activity for the selective four-electron ORR with a half-wave potential of 0.80 Vversusreversible hydrogen electrode (RHE) and for the OER with a potential of 1.65 VversusRHE to obtain 10 mA cm?2current density in 0.1 M KOH. A Zn-air battery assembled from (Co-P)0.5(Fe-P)0.5@CNT exhibited a small charge-discharge voltage gap of 0.74 V at 2 mA cm?2, a high power density of 174.5 mW cm?2and a good rechargeable stability (>120 cycles).
Examination of the Magneto-Structural Effects of Hangman Groups on Ferric Porphyrins by EPR
Nehrkorn, Joscha,Bonke, Shannon A.,Aliabadi, Azar,Schwalbe, Matthias,Schnegg, Alexander
, p. 14228 - 14237 (2019/10/19)
Ferric hangman porphyrins are bioinspired models for haem hydroperoxidase enzymes featuring an acid/base group in close vicinity to the metal center, which results in improved catalytic activity for reactions requiring O-O bond activation. These functional biomimics are examined herein with a combination of EPR techniques to determine the effects of the hanging group on the electronics of the ferric center. These results are compared to those for ferric octaethylporphyrin chloride [Fe(OEP)Cl], tetramesitylporphyrin chloride [Fe(TMP)Cl], and the pentafluorophenyl derivative [Fe(TPFPP)Cl], which were also examined herein to study the electronic effects of various substituents. Frequency-domain Fourier-transform THz-EPR combined with field domain EPR in a broad frequency range from 9.5 to 629 GHz allowed the determination of zero-field splitting parameters, revealing minor rhombicity E/D and D values in a narrow range of 6.24(8) to 6.85(5) cm-1. Thus, the hangman porphyrins display D values in the expected range for ferric porphyrin chlorides, though D appears to be correlated with the Fe-Cl bond length. Extrapolating this trend to the ferric hangman porphyrin chlorides, for which no crystal structure has been reported, indicates a slightly elongated Fe-Cl bond length compared to the non-hangman equivalent.
Electronic Configuration and Ligand Nature of Five-Coordinate Iron Porphyrin Carbene Complexes: An Experimental Study
Liu, Yulong,Xu, Wei,Zhang, Jing,Fuller, William,Schulz, Charles E.,Li, Jianfeng
supporting information, p. 5023 - 5026 (2017/05/04)
The five-coordinate iron porphyrin carbene complexes [Fe(TPP) (CCl2)] (TPP = tetraphenylporphyrin), [Fe(TTP) (CCl2)] (TTP = tetratolylporphyrin) and [Fe(TFPP) (CPh2)] (TFPP = tetra(pentafluorophenyl)porphyrin), utilizing two types of carbene ligands (CCl2 and CPh2), have been investigated by single crystal X-ray, XANES (X-ray absorption near edge spectroscopy), M?ssbauer, NMR and UV-vis spectroscopies. The XANES suggested the iron(II) oxidation state of the complexes. The multitemperature and high magnetic field M?ssbauer experiments, which show very large quadrupole splittings (QS, ΔEQ), determined the S = 0 electronic configuration. More importantly, combined structural and M?ssbauer studies, especially the comparison with the low spin iron(II) porphyrin complexes with strong diatomic ligands (CS, CO and CN-) revealed the covalent bond nature of the carbene ligands. A correlation between the iron isomer shifts (IS, δ) and the axial bond distances is established for the first time for these donor carbon ligands (:C-R).
