Mossbauer spectroscopy with

This key enzyme of the dissimilatory sulfate reduction was isolated from all Desulfovibrio strains studied until now 135), and from some sulfur oxidizing bacteria and thermophilic Archaea 136, 137). The enzymes isolated from sulfate-reducing bacteria contain two [4Fe-4S] clusters and a flavin group (FAD) as demonstrated by visible, EPR, and Mossbauer spectroscopies. With a total molecular mass ranging from 150 to 220 kDa, APS reductases have a subunit composition of the type 012)32 or 02)3. The subunit molecular mass is approximately 70 and 20 kDa for the a and )3 subunits, respectively. Amino-acid sequence data suggest that both iron-sulfur clusters are located in the (3 subunit... 

Spin-canting is conveniently studied by Mossbauer spectroscopy with large magnetic fields applied parallel to the y-ray direction. The relative areas of the six lines are given by 3 p l l p 3, where... 

Practical Aspects of Mossbauer Spectroscopy with Tungsten... 

The early Mossbauer studies using (mostly) the Ir (73 keV) transition up to about 1983 has been reviewed in an article by Wagner [298]. The author discusses all aspects of practical Mossbauer spectroscopy with this iridium probe, such as... 

Mossbauer spectroscopy with started only in 1965, when Harris et al. [322] measured the Mossbauer absorption spectra of the 99 keV transition of Pt in platinum metal as a function of temperature (between 20 and 100 K) and of absorber thickness and derived the temperature dependence of the Debye-Waller factor. 

Mobile Mossbauer Spectroscopy with MIMOS in Space and on Earth... 

The correlation of Mossbauer spectroscopy with N.Q.R. (2) for the tin tetrahalides, led to a re-evaluation of the original interpretation (21), using dvr-fTT bonding, and it also gave a negative AR/R. 

Finally, combining Mossbauer spectroscopy with IR spectroscopy, Hobert and Arnold (228) studied the interaction of amines with the surface of a-Fe203 supported on silica gel. Changes in both the Mossbauer and IR... 

Miinck, E. Surerus, K. K. Hendrich, M. P. Combining Mossbauer spectroscopy with integer spin electron paramagnetic resonance. In Methods in Enzymology, Riordan, J. F. Vallee, B. L., Eds. Academic Press New York, 1993 Vol. 227, pp 463 479. 

Mossbauer spectroscopy with the iodine isotopes is not a practical method for identification or quantification of organic compounds (nor of inorganics). It is most applicable for discerning electronic effects and charge states. For these applications, 129I gives far better results, and allows the separation of superposed subspectra. It is unfortunate that its use requires radiochemical techniques and very small scales. 

Some bioinorganic chemists may also be interested in the characterization of bioinorganic or inorganic complexes on surfaces or in thin films. Such studies are rare to date, but we refer to reviews by Shinjo and Przybylski, which deal with the characterization of iron monolayers and multilayers by CEMS. " During the last two decades Mossbauer spectroscopy with synchrotron radiation has also been developed, which gives information about the magnetization of thin iron films with a sensitivity down to the monolayer... 

A. X. Trautwein, E. BiU, E. L. Bominaar and H. Winkler, Struct. Bonding, 1991, 78, 1. A thorough overview on spin-Hamiltonian parameters and Mossbauer spectroscopy with a lot of examples of spin-coupled systems. 

Mossbauer spectroscopy (see Mossbauer Spectroscopy) has been used to look at a number of matrix-isolated species. However, the absence of structural information makes it appropriate to combine Mossbauer spectroscopy with other methods. Peden etal. report combined IR and Mossbauer spectra for the products of condensing iron vapor with CO Fe(CO)x (x = 1-5) and Fe2(CO)j, (y = 8 or 9). The Mossbauer spectra also reveal the presence of umeacted iron atoms in the solid CO, which, of course, caimot be seen in IR absorption. 

The recently synthesized Au(V) complex fluorides of the form A AuFjwith A = Xe2F, XeRJ, and Cs have been studied by Mossbauer spectroscopy with the 77.3 keV gamma resonance of Au. The values obtained for isomer shift and electric quadrupole interaction are in harmony with the assigned oxidation state Au(V), as well as with the octahedral shape of the AuFj anion. 

Fig. 3.40 The decay scheme of for Mossbauer spectroscopy with Fe. (Reprinted with permission from ref. 13. Copyright 1974 Pion Limited, London.)...

Comparision of the Fe moments at the six Fe sites in R2Fe14B obtained by polarized neutron studies and 57Fe Mossbauer spectroscopy with those derived from band structure calculations. All values are given in Bohr magnetons per Fe atom. 

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