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Fungal denitrification plays a crucial role in the nitrogen cycle and contributes to the total N2O emission from agricultural soils. Here, cytochrome P450 NO reductase (P450nor) reduces two NO to N2O using a single heme site. Despite much research, the exact nature of the critical “Intermediate I” responsible for the key N-N coupling step in P450nor is unknown. This species likely corresponds to a Fe-NHOH-type intermediate with an unknown electronic structure. Here we report a new strategy to generate a model system for this intermediate, starting from the iron(III) methylhydroxylamide complex [Fe(3,5-Me-BAFP)(NHOMe)] (1), which was fully characterized by 1H NMR, UV-vis, electron paramagnetic resonance, and vibrational spectroscopy (rRaman and NRVS). Our data show that 1 is a high-spin ferric complex with an N-bound hydroxylamide ligand that is strongly coordinated (Fe-N distance, 1.918 A Fe-NHOMe stretch, 558 cm-1). Simple one-electron oxidation of 1 at -80 C then cleanly generates the first model system for Intermediate I, [Fe(3,5-Me-BAFP)(NHOMe)]+ (1+). UV-vis, resonance Raman, and Moessbauer spectroscopies, in comparison to the chloro analogue [Fe(3,5-Me-BAFP)(Cl)]+, demonstrate that 1+ is best described as an FeIII-(NHOMe)? complex with a bound NHOMe radical. Further reactivity studies show that 1+ is highly reactive toward NO, a reaction that likely proceeds via N-N bond formation, following a radical-radical-type coupling mechanism. Our results therefore provide experimental evidence, for the first time, that an FeIII-(NHOMe)? electronic structure is indeed a reasonable electronic description for Intermediate I and that this electronic structure is advantageous for P450nor catalysis because it can greatly facilitate N-N bond formation and, ultimately, N2O generation.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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A probe based on ferrocene structure has been designed, synthesized and elucidated from the single crystal X-ray method. It demonstrated fluorescence response to Hg2+ and Cu2+ in CH3OH. The results indicated that the title complex could be applied in the multianalyte detection. Binding ability of receptor 3 in CH3OH was tested for various cations (Fe3+, Co2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+, and Ba2+ in water). The computed binding constants for Hg2+ and Cu2+ indicated a distinct absorbance shift. The receptor is an attractive array due to its distinct absorbance shift profile in a semi-aqueous phase, making it applicable in biology, environmental sciences and material chemistry.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Background: Metal organic compounds have attracted considerable attention since the advent of Salvarsan, a metal organic compound for the treatment of syphilis. Ferrocene as an effective phenyl bioisostere is becoming a viable platform for drug design by virtue of its redox properties, high lipophilicity and three-dimensional metallocene unit, which may lead to some changes in selectivity toward biological targets compared with phenyl or alkyl groups. Therefore, ferrocene seems to an appropriate candidate for improving the antioxidant activity of drugs. Methods: We synthesized four ferrocenyl-containing curcumin analogues by introducing ferrocenyl groups into the active methylene groups to obtain higher antioxidant activity than the parent ferrocene-substituted curcumin analogues, and their antioxidant activities were evaluated in 2, 2?-azobis (2-amidinopropane hydrochloride) (AAPH) and Cu2+/glutathione(GSH)-induced oxidation of DNA, and in trapping 2, 2?-diphenyl-1-picrylhydrazyl (DPPH), 2, 2?-azinobis(3-ethylbenzothiazoline-6-sulfonate) cationic radicals (ABTS+?) and galvinoxyl radicals. Results: These ferrocenyl-containing curcumin analogues can protect DNA against Cu2+/GSH-induced oxidation, and scavenge 5.7, 6.9, 5.5 and 5.3 radicals in protecting DNA against AAPH-induced oxidation. Compounds (3)~(5) can trap more DPPH, ABTS+? and galvinoxyl radicals than compound (6). The substituents and iron atoms play an antioxidant role in ferrocenyl-containing curcumin analogues. Conclusion: The introduction of ferrocenyl group results in a higher antioxidant activity than the traditional hydroxyl-involved curcumin analogues. The ferrocenyl group is a powerful antioxidative group that could be used to modify natural antioxidants. The electron-accepting group attaching to the phenyl-group could further increase the antioxidant activity. Ferrocene-containing curcumin analogues show higher activities in quenching radicals and protecting DNA against radical-induced oxidation. Therefore, the introduction of ferrocenyl group into the natural antioxidant may contribute to increase the antioxidant activity.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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The Ir and Raman spectra of gaseous (C5H5)Fe(C5H4COCH3) and (C5H4COCH3)2Fe were recorded in the frequency range 20-4000 cm-1.Both the gaseous complexes show a Raman absorption at 41 +/- 2 cm-1 which was assigned to the torsional frequency omega0.1 .In these molecules a barrier of 1000 +/- 100 cal/mol restricts the rotation of the cyclopentadienyl ring with respect to the rigid frame.The thermodynamic functions of the gaseous ferrocenes are reported in the temperature range 298-450 deg K.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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In order to investigate the ways in which heterogeneous kinetics at semiconductor electrodes are affected by various combinations of the formal reduction potentials of solution species and the energetic condition of the electrode surface. The authors have measured cyclic voltammetric dark currents in acetonitrile solutions for cobaltocene and a number of ferrocene derivatives at highly doped p-InP electrodes. Proper interpretation of the cyclic voltammetric data requires specific knowledge of the energetics at the semiconductor electrode/solution interface. This information has been derived from capacitance data that was obtained in the same solutions and within the same potential regions as the cyclic voltammetry and with experiments.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Ferrocene containing N-tosyl hydrazones as selective and sensitive optical and electrochemical chemosensors were synthesized and characterized by 1H NMR, 13C NMR, ESI-MS and X-ray analysis. The cation and anion binding studies were carried out using various techniques including electrochemistry, UV?vis and 1H NMR spectroscopy. Chemosensors 2a and 2b have shown excellent selective recognition toward Hg2+, Cu2+ and F? through optical and electrochemical signals. The color of 2a and 2b in solution changed visibly from pale yellow to red upon addition of Hg2+ion, while the color of solution changed from pale yellow to yellow green upon addition of Cu2+, which can be easily detected by the naked eye.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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The solubility of acetylferrocene and diacetylferrocene in mixtures of water with dimethylsulfoxide was determined as a function of temperature and mole fraction of the organic component. Changes in the thermodynamic functions in the transfer of acetylferrocene and diacetylferrocene from water into a mixed solvent were estimated and analyzed.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

Chemical engineers work across a number of sectors, processes differ within each of these areas, but chemistry and chemical engineering roles are found throughout, creation and manufacturing process of chemical products and materials. Safety of 1,1′-Diacetylferrocene. Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. Introducing a new discovery about 1273-94-5, Name is 1,1′-Diacetylferrocene

The reactions of mono(cyclopentadienyl)titanium(IV) trichloride with a new class of Schiff bases (H2L), derived by condensing 1,1?-diacetylferrocene with different 3-substituted phenyl-4-amino-5- mercapto-1,2,4-triazoIes, have been studied both by a conventional stirring method and also using microwave technology. Binuclear products of type [{eta5-C5H5)TiCl2}2 (L)] have been isolated in both cases. Tentative structural conclusions are drawn for the reaction products based upon analysis, electrical conductance, magnetic moment and spectral (UV-Visible, IR, 1H NMR and 13C NMR) data. FAB mass spectra of complexes were also recorded to confirm the binuclear structures. Studies were conducted to assess the growth inhibiting potential of the ligands and complexes against various fungal and bacterial strains.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

Some examples of the diverse research done by chemistry experts include discovery of new medicines and vaccines,and development of new chemical products and materials. In a article, mentioned the application of 1273-94-5, Name is 1,1′-Diacetylferrocene, molecular formula is C14H6FeO2

The anodic electrochemical oxidations of ReCp(CO)3 (1, Cp = eta5-C5H5), Re(eta5-C 5H4NH2)(CO)3 (2), and ReCp*(CO)3 (3, Cp* = eta5-C 5Me5), have been studied in CH2Cl2 containing [NBu4][TFAB] (TFAB = [B(C6F5) 4]-) as supporting electrolyte. One-electron oxidations were observed with E1/2 = 1.16, 0.79, and 0.91 V vs ferrocene for 1-3, respectively. In each case, rapid dimerization of the radical cation gave the dimer dication, [Re2Cpgamma2(CO) 6]2+ (where Cpgamma represents a generic cyclopentadienyl ligand), which may be itself reduced cathodically back to the original 18-electron neutral complex ReCpgamma(CO)3. DFT calculations show that the SOMO of 1+ is highly Re-based and hybridized to point away from the metal, thereby facilitating the dimerization process and other reactions of the Re(II) center. The dimers, isolated in all three cases, have long metal-metal bonds that are unsupported by bridging ligands, the bond lengths being calculated as 3.229 A for [Re 2Cp2(CO)6]2+ (12 2+) and measured as 3.1097 A for [Re2(C 5H4NH2)2(CO)6] 2+ (222+) by X-ray crystallography on [Re 2(C5H4NH2)2(CO) 6][TFAB]2. The monomer/dimer equilibrium constants are between Kdim = 105 M-1 and 107 M-1 for these systems, so that partial dissociation of the dimers gives a modest amount of the corresponding monomer that is free to undergo radical cation reactions. The radical 1+ slowly abstracts a chlorine atom from dichloromethane to give the 18-electron complex [ReCp(CO) 3Cl]+ as a side product. The radical cation 1+ acts as a powerful one-electron oxidant capable of effectively driving outer-sphere electron-transfer reactions with reagents having potentials of up to 0.9 V vs ferrocene.

The result showed that such a combination of chemo- and biocatalysis improved the catalytic yield more than two times compared with that of sole metal catalysis. We will look forword to the important role of 1273-94-5, and how the biochemistry of the body works.Synthetic Route of 1273-94-5

Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

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Using a template-based method to molecular self-assembly, the ability of ferrocene (FcH) and two of its acetylated derivatives [FcAc, 1,1′-Fc(Ac)2] to induce formation of a supramolecular deep cavity based upon C- methylcalix[4]resorcinarene 1 and 4,4′-bipyridine 2, 1.2(2), 3, is revealed; equatorial inclusion of 1,1′-Fc(Ac)2 within 3 promotes a change in conformation of the guest.

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Reference：
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion