Electronic effects of group fragments on the XPS of Fe 2p and 3p photoelectron lines of ferrocenyl-containing chalcones

Erasmus, Elizabeth

doi:10.17159/0379-4350/2017/v70a13

Cited by 10 publications

(3 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The iron comprises two oxidation states: Fe 2+ and Fe 3+ . The lowest binding energy peak at 707.6eV is attributed to the Fe 2+ of the ferrocene unit grafted onto the aerogel surface, which agrees with the literature on compounds that have ferrocene in their structure [32]. Since Fe 2+ is a low-spin configuration, no satellite feature is observed.…”

Section: Xps Resultssupporting

confidence: 88%

Ferrocene Introduced into 5-Methylresorcinol-Based Organic Aerogels

et al. 2020

View full text Add to dashboard Cite

The polycondensation sol–gel reaction of 5-methylresocinol and formaldehyde with additional compounds in reaction media is a relatively simple way to produce modified aerogels. In order to obtain aerogels with a large surface area and high porosity, the conditions for gel formation, the solvent exchange process before drying, and the supercritical drying process were optimized. A successful attempt was made to introduce ferrocene units into 5-methylresocinol-formaldehyde-based aerogels. The resulting aerogels are amorphous substrates, and no aggregated ferrocene units were found in their structures. All of the aerogel samples that were obtained are structurally similar despite differences in the original ferrocene units and their initial concentration. It was found that the inclusion limit of ferrocene structural blocks into an aerogel is ~6% wt. The structures of the inclusions in which all of the Fe atoms in the aerogel substrates were present in ferrocene/ferrocenium at an approximate ratio of 60/40 to 55/45 were confirmed by X-ray photoelectron spectroscopy and Mössbauer spectroscopy. Aerogels with ferrocene/ferrocenium inclusions are likely to exhibit reversible redox activity in reactions with gaseous reagents.

show abstract

Section: Xps Resultssupporting

confidence: 88%

Ferrocene Introduced into 5-Methylresorcinol-Based Organic Aerogels

et al. 2020

View full text Add to dashboard Cite

show abstract

“…XPS was conducted on a PHI 5000 Versaprobe spectrometer using monochromatic Al Kα radiation ( hν = 1253.6 eV), to characterize the surfaces of the modified silica nanopowders. The specific details of the XPS study are similar to those of other XPS studies reported from our laboratory. − …”

Section: Methodsmentioning

confidence: 64%

Silica Nanopowder Supported Frustrated Lewis Pairs for CO₂ Capture and Conversion to Formic Acid

et al. 2020

View full text Add to dashboard Cite

Treatment of hydroxylated silica nanopowders S1 and allyl-functionalized silica nanopowders S2 with 3-(diphenylborano)- or 3-bis(pentafluorophenylborano)propyltrimethoxysilane or 2-(diphenylphosphino)- or 2-(dicyclohexylphosphino)ethyltriethoxysilane generates silica nanopowder supported Lewis acids S3 and silica nanopowder supported Lewis bases S4. These surfaces were characterized by 13C, 11B, and 31P cross-polarization magic angle spinning nuclear magnetic resonance (CP MAS NMR), X-ray photoelectron spectroscopy (XPS), and attenuated total reflection Fourier transform infrared (ATR FTIR). When S3 is combined with solution-phase Lewis bases PR3 (R = C6F5, C6H5, mesityl), six associated silica nanopowder supported frustrated Lewis pairs (FLPs) are formed. In another set of six reactions, the interactions between the supported Lewis bases S4 and solution-phase Lewis acids BR3 with R = C6F5, C6H5, mesityl produced six more associated supported FLPs. The capture of CO2 by these FLPs producing FLP-CO2 Lewis pair adducts S5 and S6 were highlighted by ATR FTIR, and it was found that FLP S5e with R = C6H5 on both the supported Lewis acid and solution-phase Lewis base trapped the largest quantities of CO2 on the silica nanopowder supports. Conversion of CO2 to HCOOH was achieved by first activating H2 to generate activated FLP-H2 surfaces S7 and S9. Addition of CO2 then generated HCOOH via the silica nanopowder supported FLP-HCOOH adducts S8 and S10. Qualitative identification of HCOOH generation was achieved by ATR FTIR measurements, and surface 10b with R = C6H5 proved to be the most successful silica nanopowder surface bound FLP in HCOOH generation. In some cases, diborano formates (−BO(CH)OB−) S11 and S12 were also identified as side products during HCOOH formation. Spectroscopic characterization of purposefully synthesized S11 and S12 included 11B and 31P CP MAS NMR.

show abstract

“…Although not normally used as a quantitative technique, XPS accurately detected the ratios between atomic %, − thus giving a good indication (estimation) of the composition. A summary of the atomic ratios between the metals as well as the ratios between different compounds (e.g., WC and WO) is given in Table .…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Decomposition of an Azo Dye Using Transition-Metal-Doped Tungsten and Molybdenum Carbides

2022

View full text Add to dashboard Cite

The preparation, characterization, and photocatalytic application of tungsten or molybdenum carbides (Ni-WC, 1 , Co-WC, 2 , Ni-MoC, 3 , Co-MoC, 4 , NiCo-WC, 5 , NiCo-MoC, 6 , NiFe-WC, 7 , and NiFe-MoC, 8 ) doped with transition metals (Fe, Co, and Ni) are reported. These transition-metal carbide (TMC) particles show that the submicrometer globular particles agglomerated to form larger particles, with smaller crystallites present on the surface of the large particles. These crystallite sizes range between 4 and 34 nm (as calculated from X-ray diffraction data) depending on the metal dopant and type of carbide. Oxidation of the metal carbides is evident from the two sets of photoelectron lines present in the X-ray photoelectron spectroscopy (XPS) of the W 4f area. The Mo 3d spectra reveal four sets of photoelectron lines associated with oxidized MoO 2 and MoO 3 as well as Mo 2+ and Mo 3+ associated with MoC 1– x . The XPS of the dopant metals Ni, Co, and Fe also show partial oxidation. The photocatalytic decomposition of Congo red (an azo dye) is used as a model reaction to determine the photocatalytic activities of the transition-metal carbides, which is related to the TMCs’ optical band gap energies.

show abstract

Electronic effects of group fragments on the XPS of Fe 2p and 3p photoelectron lines of ferrocenyl-containing chalcones

Cited by 10 publications

References 33 publications

Ferrocene Introduced into 5-Methylresorcinol-Based Organic Aerogels

Ferrocene Introduced into 5-Methylresorcinol-Based Organic Aerogels

Silica Nanopowder Supported Frustrated Lewis Pairs for CO₂ Capture and Conversion to Formic Acid

Photocatalytic Decomposition of an Azo Dye Using Transition-Metal-Doped Tungsten and Molybdenum Carbides

Contact Info

Product

Resources

About

Electronic effects of group fragments on the XPS of Fe 2p and 3p photoelectron lines of ferrocenyl-containing chalcones

Cited by 10 publications

References 33 publications

Ferrocene Introduced into 5-Methylresorcinol-Based Organic Aerogels

Ferrocene Introduced into 5-Methylresorcinol-Based Organic Aerogels

Silica Nanopowder Supported Frustrated Lewis Pairs for CO2 Capture and Conversion to Formic Acid

Photocatalytic Decomposition of an Azo Dye Using Transition-Metal-Doped Tungsten and Molybdenum Carbides

Contact Info

Product

Resources

About

Silica Nanopowder Supported Frustrated Lewis Pairs for CO₂ Capture and Conversion to Formic Acid