Green Mossbauer spectrum

Berlin blue, Mossbauer spectrum of, 6 462-464 Berlin green... 

Fig. 13-1 shows a Mossbauer spectrum of the carbonate form of green rust with two separate doublets fitted to both the Fe and Fe doublet. 

Fig. 13-1. Mossbauer spectrum of carbonate green rust recorded at 120 K and fitted to two Fe and two Fe doublets. Courtesy E. Murad (see Murad and Taylor, 1984).

Mossbauer spectroscopy is ideally suited to follow the light-induced spin state conversion in [Fe(ptz)6]BF4)2 as exemplified in Fig. 2.18. A polycrystalline sample of [Fe(ptz)6](BF4)2 was cooled to 15 K. Before irradiation, the sample is in the LS state and shows the typical Mossbauer spectrum of Fe°-LS (upper left). After irradiating with green light (Xe lamp with filters or 514 nm band of an Ar ion laser) at 15 K the sample is quantitatively converted to the metastable HS state (middle left). The asymmetry in the intensity of the two components of the... 

A green rust related mineral in soils was first discovered in a so-called gleysol at Fougferes (Brittany, France) and has therefore been named fougerite [135]. The Mossbauer spectrum, usually measured at lower temperatures (78 K) to avoid oxidation, is typical for green rust, consisting of one or two Fe " doublets with (5 1.25 mm/s and with A 2.60-2.90 mm/s and a Fe " doublet with... 

Fig. 3.17 Mossbauer spectrum of a Fougbrite sample at 78 K (a) compared with the spectrum of a synthetic oxidized green rust sample with the same Fe " molar fraction x (b) Mossbauer spectrum of a green rust related sample from Trebeurden (c) and the spectrum of a similar sample from the Mont Saint Michel (d) (adapted from Ref. [307])...

Fig. 6.31 a Mossbauer spectrum of Mn/ pe in p-type multi-crystalline-Si black points) is compared with that in Si-solar cells red points) at 400 K under Xe lamp illumination. The black spectrum is fitted with red and green components, b The difference of the red and black spectra is shown with blue points. The difference spectrum can be analyzed by the appearing three singlets pink, yellow, and light blue components and the two disappearing singlets red and green components)... 

Figure 4.69 Mossbauer spectrum of sample 3.1 A red) and B dark red) sites in magnetite, as weU as goethite pink) and hydroxide green) were identified...

The [Fe =0(TMP+ )]+ complex exhibited a characteristic bright green color and corresponding visible absorbance in its UV-vis spectrum. In its NMR spectrum, the meta-proton doublet of the porphyrin mesityl groups were shifted more than 70 ppm downfield from tetramethylsilane (TMS) because they were in the presence of the cation radical, while the methyl protons shift between 10 and 20ppm downfield. In Mossbauer spectroscopy, the isomer shift, 5 of 0.06 mm/s, and A q value of 1.62mm/s were similar to those for other known Fe(IV) complexes. Electron paramagnetic resonance (EPR), resonance Raman (RR), and EXAFS spectroscopies provided additional indications of an Fe =0 n-cation radical intermediate. For instance,... 

The only ruthenium(V) halides reported are those containing fluoride. Green ruthenium(V) fluoride can be prepared by direct fluorination of the metal at 300°C, by reduction of [RuF ] with BiFj, SbFj, Ru or or by reaction of the metal and BrFj. The latter method first generates [BrFj] [RuF ] which decomposes at 120°C in vacuo to give tRuF5]4 and BrFj. The tetrameric structure (369) has been confirmed by X-ray analysis, but its mass spectrum indicates that the vapour consists of an equilibrium between monomer, dimer, trimer and tetramer units. Magnetic measurements reveal the presence of significant interactions between adjacent metal ions. Mossbauer and IR spectral measurements are also available. Some of the reactions of [RuFj]4 are discussed below but further details are to be found in reference 3, p. 79. 

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