An X-Ray Photoelectron and X-Ray Absorption Spectroscopic Study of Colloidal [Mn0·0.3THF]x

Abstract

The formation of colloidal dispersions of Mn is possible via the chemical reduction of MnBr2·2THF. The resulting hydrogen‐free organosol is studied in detail by a combination of physical methods, including X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption spectroscopy (XAS). It is concluded that the metal colloid consists of small Mn particles in the zero‐valent state, stabilized by intact THF molecules. Nanostructured organosols of the early transition metal series are of interest as powerful additives for the activation of heterogeneous hydrogenation catalysts.

Electron- and hole-doping effects on the electronic structure of manganite studied by x-ray absorption spectroscopy

“…This shows consistency in O and Mn K-edge measurements. The very shallow feature B 2 is only noticeable in the Ce-LM spectrum; it has been attributed to an increased p-character in the lowest empty Mn 3d-like electronic band [26]. Inset (b) in figure 3(i) shows the comparison of features C 2 and D 2 in the Ca-LM, Ce-LM and LM Mn K-edge spectra.…”

Self-Assembly of a C16M[Mn] Magnetic Surfactant in Water

“…However, the chemical composition of the anions is uncertain as the oxidation of Mn­(II) sometimes occurs during the complexation . It is well-known that XPS can provide qualitative and quantitative analysis of chemical components . To study the chemical composition of magnetic anions, XPS of the magnetic surfactant (Figure S4) is carried out.…”

“…It can be found that Mn(II) was not oxidized to a higher valence, because the fine structure is not found in the range of 642−652 eV. 43 Via analysis of the peak areas (Figure S4) of Mn 2p, Cl 2p, and Br 3d, the Mn:Cl:Br element ratio is calculated to be 1:2:1. Hence, the anion of C 16 M[Mn] is [MnCl 2 Br] − .…”

“…42 It is well-known that XPS can provide qualitative and quantitative analysis of chemical components. 43 To study the chemical composition of magnetic anions, XPS of the magnetic surfactant (Figure S4) is carried out. Panels a−c of Figure 1 show the XPS spectral fitting analyses of Mn 2p, Cl 2p, and Br 3d, respectively, of C 16 M[Mn], and the fitting data are included in Table S1.…”

Synthetic Approaches to Metallic Nanomaterials

“…1.1. By analogy, [Mn · 0.3 THF] particles (1-2.5 nm) were prepared [143] and the physical properties studied [144]. 1.6).…”