Spectrometry Mossbauer spectroscopy

The coordination of [Me2Sn(IV)f to captopril (cap) [(2S)-l-[(2S)-2-methyl-3-sulfanyl propanoyl]pyrrolidine-2-carboxylic acid] in aqueous solution was studied by means of pH-metric titration, electrospray mass spectrometry, H NMR, and Mossbauer spectroscopies in the 2-11 pH range. The results obtained proved that only monomeric complexes are formed in solution. In the acidic pH... 

The samples were characterized by using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, 57Fe Mossbauer spectroscopy [2] and Rutherford backscattering spectrometry (RBS). 

The first isolable, albeit binuclear, butatrienylidene complexes, the cationic diiron complexes 8, were likewise prepared by addition of an electrophile E+ to neutral butadiynyl complexes. Instead of mononuclear butadiynyl complexes, binuclear C4-bridged butadiyndiyl complexes 7 were used as the starting complexes by Lapinte et al. (Scheme 3.4) [18]. Complexes 8 were characterized by multinuclear NMR, IR, UV-vis, and Mossbauer spectroscopies, mass spectrometry and cyclic voltammetry. 

Reflecting their aromaticity, porphyrins usually give strong M(Por) + and M(Por) 2+ mass peaks, though some fragmentations of the side chains and loss of the metal from labile metalloporphyrins are often observed.2 The ionization energy of M(TPP) (M = H2, Cu) was reported to be 8.0eV by mass spectrometry. MCD, CD, resonance Raman, Zeeman, ENDOR, ESR and Mossbauer spectroscopies have been reviewed in detail.2... 

The following sections summarize the applications of fast atom bombardment mass spectrometry, Mossbauer and NMR spectroscopies, and single-crystal X-ray diffraction studies in the characterization of het-eronuclear gold cluster compounds. 

We are grateful to the students, collaborators, and colleagues cited in the references, in particular Jean-Claude Blais (MALDI-TOF mass spectrometry, University Paris VI) and Francois Varret (Mossbauer spectroscopy, University of Versailles) for their invaluable contributions to the ideas and experimental efforts that have led to the results presented herein. Financial support from the Institut Universitaire de France (DA), the CNRS, the Universities Bordeaux I and Paris VI, the Ministere de l Enseignement et de la Recherche Scientifique, and the Region Aquitaine is also gratefully acknowledged. 

Spectroscopy (spectrometry) — MoRbauer (Mossbauer) spectroscopy — Table... 

The catalysts were characterized by a variety of techniques including infrared spectroscopy, X-ray powder diffractometry, X-ray photoelectron spectroscopy, ionscattering spectrometry and Mossbauer spectroscopy. 

The AAS method has several limitations. For the trace elements, particularly the colorants cobalt and nickel, the dilution factor required for analyses of 12 elements by continuous nebulization places these elements close to the detection limits for flame AAS. More accurate data on these and other trace elements are necessary before conclusions can be drawn on the source minerals used to impart color. Phosphorus, a ubiquitous minor component of medieval stained glass, has not been determined by AAS in the course of this work, but has the potential to provide key information on sources of plant ash. A full understanding of the colorant role of the transition metal elements is not possible on the basis of analysis alone UV-visible spectroscopy, electron spin resonance spectrometry, and Mossbauer spectroscopy, for example, are necessary adjuncts to achieve this aim. The results of the application of these techniques and the extension of the AAS method to trace element determination by pulse nebulization and furnace atomization will be addressed in future reports. 

Nolle G, Ullrich H, Muller JB, Hesse J (1983) A microprocessor controlled spectrometer for thermal scan Mossbauer spectroscopy. Nucl Instr Meth Phys Res 207 459-463 Nomura K, UjiMra Y, Vertes A (1996) Apphcations of conversion electron Mossbauer spectrometry (GEMS). J Radioanal Nucl Chem 202 103-199... 

These molecular adducts were investigated by IR (351, 353-365), and electronic spectroscopy (353-365), magnetic measurements (353-365), mass spectrometry (in some cases) (357, 358, 361, 364), Mossbauer spectroscopy [for iron(III) complexes] (353, 354, 365). These physicochemical studies led to the proposal of plausible geometries. 

R. H. Herber, Prog. Inorg. Chem., 1967,8, 1 V. 1. Goldanskii and R. Herber, Chemical Applications of Mossbauer Spectroscopy, Academic Press, 1968 N. N. Greenwood in Physical Chemistry, An Advanced Treatise, Vol. 4, Chapter 12, Academic Press, 1970 N. N. Greenwood and T. C. Gibb, Mossbauer Spectrometry, Chapman Hall, 1971. 

On the other hand, based on pyrolysis mass spectrometry, pyrolysis gas chromatography, microanalysis and mainly Mossbauer spectroscopy ", Yeager and his collaborators who were mainly working at high pyrolysis temperatures (800-850°C) disagreed with the previous school. They concluded that the decomposition of Me-N4 macrocycles starts at about 400-500°C. At 800°C, despite the fact that heat-treated samples retain more than 80% of the nitrogen atom content measured for the untreated... 

The techniques already discussed account for the vast majority of in situ spectro-electrochemical studies. There are, however, a few others, namely, surface conductance, in situ photoemission, photocurrent spectroscopy, in situ mass spectrometry, surface plasmon spectroscopy, Mossbauer spectroscopy, and in situ X-ray diffraction that at least deserve to be mentioned. 

Mass spectrometry Vibrational spectroscopy Electronic spectroscopy NMR spectroscopy EPR spectroscopy Mossbauer spectroscopy Diffraction methods Photoelectron spectroscopy Computational methods... 

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