Mossbauer shift

The electronic spectra of cis- and trans-[FeX2(CNAr) ] (X = Cl and/or SnCl3) and [Fe(SnCl3)(CNAr)5]C104 (Ar = p-MeOC H ) have been reported and for the first time a splitting of the state has been observed for a low-spin Fe compound. The tin atom is formally in the oxidation state (ii) however. the Sn Mossbauer shift lies in the region expected for... 

Fig. 7. Plot of Mossbauer shifts for some ruthenium nitrosyl and related complexes , Ru A, Ru +, Ru O, Ru x, Ru anomalous complexes.

Table 5. The Mossbauer Shifts of Tin and Some Tin Compounds Relative...

MS Mossbauer Spectroscopy [233-236] Chemical shift of nuclear energy states, usually of iron Chemical state of atoms... 

Another point of contention has been the extent to which, if any, SbFj is reduced to SbFs upon intercalation. Although chemical analyses have shown an F Sb ratio of 5 1 (Lll, M5), Sb Mossbauer measurements (B24) indicated partial reduction of Sb(V) to Sb(III). On the other hand, mass-spectral measurements as a function of temperature (S15) showed only SbFs, evolved in stages, with no fluorocarbons emitted at any time. The latter are usually an indication of partial reduction of the intercalant and fluorination of the graphite host. Wide-line, F-NMR chemical-shifts are consistent with either SbFj or SbFe, but not with SbFs, but the occurrence of fluorine exchange could produce minor amounts of trivalent species (FI 1) this point is thus still controversial, and will be alluded to again. 

Mossbauer data also seemed to agree with the proposal of a [6Fe-6S] cluster ill). About two-thirds of the Fe intensity of the reduced protein (i.e., four out of the proposed total of six) had isomer shift... 

Figure 2A. Schematic diagram of Mossbauer parameters isomer shift (6), quadrupole splitting (AEq) and magnetic dipole splitting of the nuclear energy states of 57pe leading to various hyperfine splitting in Mossbauer spectra.

Figure 8. Saturation magnetization (Gs) and the Mossbauer Isomer shift (6) vs S102/A1203 ratio. The arrows show the ratio =17, at which the acidity is highest.

---