HPLC of Formula: 175136-62-6. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Tris(3,5-bis(trifluoromethyl)phenyl)phosphine, is researched, Molecular C24H9F18P, CAS is 175136-62-6, about Diferrate [Fe2(CO)6(μ-CO){μ-P(aryl)2}]- as self-assembling iron/phosphor-based catalyst for the hydrogen evolution reaction in photocatalytic proton reduction-spectroscopic insights. Author is Fischer, Steffen; Roesel, Arend; Kammer, Anja; Barsch, Enrico; Schoch, Roland; Junge, Henrik; Bauer, Matthias; Beller, Matthias; Ludwig, Ralf.
This work is focused on the identification and investigation of the catalytically relevant key iron species in a photocatalytic proton reduction system described by Beller and co-workers. The system is driven by visible light and consists of the low-cost [Fe3(CO)12] as catalyst precursor, electron-poor phosphines P(R)3 as co-catalysts, and a standard iridium-based photosensitizer dissolved in a mixture of THF, water, and the sacrificial reagent triethylamine. The catalytic reaction system was investigated by operando continuous-flow FTIR spectroscopy coupled with H2 gas volumetry, as well as by x-ray absorption spectroscopy, NMR spectroscopy, DFT calculations, and cyclic voltammetry. Several iron carbonyl species were identified, all of which emerge throughout the catalytic process. Depending on the applied P(R)3, the iron carbonyl species were finally converted into [Fe2(CO)6(μ-CO){μ-P(R)2}]-. This involves a P-C cleavage reaction. The requirements of P(R)3 and the necessary reaction conditions are specified. [Fe2(CO)6(μ-CO){μ-P(R)2}]- represents a self-assembling, sulfur-free [FeFe]-hydrogenase active-site mimic and shows good catalytic activity if the substituent R is electron poor. Deactivation mechanisms have also been investigated, for example, the decomposition of the photosensitizer or processes observed in the case of excessive amounts of P(R)3. [Fe2(CO)6(μ-CO){μ-P(R)2}]- has potential for future applications.
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Reference:
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