Synthesis and XPS characterization of Si-supported chromium(0) Fischer aminocarbene complexes

Abstract

CO Cr CO CO OC OC X Keywords:Fischer carbene complex; XPS; silane anchoring. Highlights •Synthesis of Si-supported amino Fischer carbenes.• X-ray photoelectron spectroscopy of supported amino Fischer carbenes.• Cr 2p 3/2 binding energies of ethoxy-, amino-and Si-supported Fischer carbenes AbstractEthoxy chromium (0) Fischer carbene pentacarbonyl complexes [(CO) 5 CrC(OEt)R]; R = 2thienyl (1), 2-furyl (2) were covalently anchored onto aminopropyltrimethoxysilanefunctionalised silicon-wafers to form Cr-grafted Si-wafers S1 and S2 that were characterized by X-ray photoelectron spectroscopy (XPS). X-ray photoelectron spectroscopy determined that binding energy of the Cr 2p 3/2 photoelectron line of the thienyl-containing complexes were smaller than that of the furyl-containing complexes. The binding energy of the Cr 2p 3/2 photoelectron line of the ethoxycarbene complexes was smaller than that of aminocarbenes.The binding energy of the Cr 2p 3/2 photoelectron line of the Cr-grafted Si-wafers were ca. 1 eV higher than that of the related aminocarbenes. A 25 -33 % anchoring of the Crcomplexes 1 and 2 on the aminopropyltrimethoxysilane-functionalised silicon-wafers was achieved.

Investigation into the Anticoking Performances of Sol–Gel-Derived SiO2 and SiO2–CeO2 Coatings during Thermal Pyrolysis of Light Naphtha

“…Figure b depicts the Si 2p XPS spectrum, which was deconvoluted into constituent satellite peaks. The strongest peak with the binding energy at 103.6 eV corresponds to the Si–O–Si bonds, whereas the main peak at about 105.8 eV is from the SiO 2 network. ,, Two additional peaks at 102.2 and 103.0 eV, which possess weaker areas, are from Si–OC 2 H 5 and Si–OH groups. , The O 1s spectrum of the coating is shown in Figure c. It is shown that there are mainly four types of oxygen species in the spectrum.…”

“…33,40,41 Two additional peaks at 102.2 and 103.0 eV, which possess weaker areas, are from Si−OC 2 H 5 and Si−OH groups. 42,43 The O 1s spectrum of the coating is shown in Figure 6c. It is shown that there are mainly four types of oxygen species in the spectrum.…”

Catalytic transesterification of glycerol with dimethyl carbonate to glycerol carbonate with Co3O4 nanoparticle incorporated MCM‐41 derived from rice husk

“…The deconvoluted Si 2p spectra reveal the existence of peaks at a binding energy of 102.32, 103.00, and 103.51 eV due to the presence of Si‐C, SiO 2 , and Si‐O, respectively (Figure 6E). [ 42,43 ]…”

“…The deconvoluted Si 2p spectra reveal the existence of peaks at a binding energy of 102.32, 103.00, and 103.51 eV due to the presence of Si-C, SiO 2 , and Si-O, respectively (Figure 6E). [42,43] Apart from the silicate peaks, the XPS spectra of cobalt was deconvoluted into four peaks at binding energy, 781.08, 782.89, 786.88, and 797.43 eV, indicating the existence of different states of cobalt on MCM-41. Furthermore, the formation of clear spin-orbit doublets located at around 781.08 and 782.89 eV was due to the contribution of Co 3+ associated to Co 2p 3/2 oxidation states (Figure 6F), respectively.…”

Chromium-rich CrxIr1−xO2 wire-in-tube alloys for boosted water oxidation with long standing electrocatalytic activity

“…Meanwhile, two peaks observed at 575.0 eV and 585.0 eV are consistent with the characteristic value of Cr(III) 2p 3/2 and 2p 1/2 originated from Cr 2 O 3 , and the peaks at 578.1 eV and 588.2 eV are derived from CrOOH species, respectively. 43 For Cr(III) 2p 3/2 and 2p 1/2 of Cr x Ir 1Àx O 2 @400 C, it was shied to lower binding energy compared to pure Cr 2 O 3 , which implies a higher electron density at the Cr sites with the electron-withdrawing effect of Cr. 8 The appearance of CrOOH on the outer surface of Cr x -Ir 1Àx O 2 @400 C resulted from the adventitious reaction between Cr(IV) and the proton from the environment.…”