Mossbauer complexes

Platinum ammine complexes have been a fertile area for studying transinfluence. Table 3.21 lists data for a range of ammines showing how /(195Pt-15N) depends upon the trans-atom [153]. (A further selection of data can be found in R.V. Parish, NMR, NQR, EPR and Mossbauer Spectroscopy in Inorganic Chemistry, Ellis-Horwood, Chichester, 1991, pp. 76, 87.) Possibly the most detailed study (of complexes of tribenzylphosphine) examined over a hundred neutral and cationic complexes [154] (Table 3.22). 

Table 3. Mossbauer data of iron silylene complexes (Fe as standard)...

The application of Mossbauer spectroscopy in the study of mixed ligand complexes. K. Burger, Inorg. Chim. Acta, Rev., 1972, 6, 31-46 (125). 

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... 

On the other hand, the [Bu2Sn(lV)] complexes of the O analogs of the above-mentioned ligands are linear oligomers. The FT-IR and Raman spectroscopic data indicated the presence of bidentate and/or monodentate -COO groups, nonlinear C-Sn-C bonds, and Sn-O bonds within the complexes. The results of Mossbauer spectroscopic measurements showed a Tbp arrangement around the central Sn atom in addition to the and structures. ... 

Comparison of the Mossbauer I Agxp I values with those calculated on the basis of the pqs formalism revealed that the organotin(IV) moiety has Tbp geometry, and in certain cases geometry too. Some of the complexes contain the organotin(IV) cation in two different environments. Finally, the local structure of the maleic acid complex formed with [Bu2Sn(IV)l was determined by an EXAFS method.The structural data are collected in Table 6. Similar studies... 

The structure and dynamics for some representatives of the series of [Me2Sn(IV)] , [MeSn(IV)] , and inorganic Sn(IV) complexes with (S, Nj-contain-ing donors have been determined by Sn Mossbauer spectroscopy and are reported in Ref. (292). 

Barbieri, R. Pellerito, L. Ruisi, G. Silvestri, A. Barbieri-Paulsen, A. Barone, G. Posante, S. Rossi, M. Sn Mossbauer spectroscopy studies on the interaction of organotin(IV) salts and complexes with biological systems and molecules. In Gianguzza, A. Pelizzetti, E. Sammartano, S. (Eds.), Chemical Processes in Marine Environments, Springer Verlag, Berlin, 2000 Chapter 12, p. 229. 

For example, octahedral quadrupole splitting observed for the cis-octahedral analogs 7,8). More recently, temperature-dependent Mossbauer measurements have been used in conjunction with Raman spectroscopy to determine molecular weights 453) and lattice rigidity 460) of various organotin compounds. 

This section on N2 complexes concludes with a brief mention of a Mossbauer study of the Fe/N2 system (8). The N2 stoichiometries were... 

The preparation and characterization, and Mossbauer and epr spectra of Fe(II) and Fe(III) complexes of cyclopentadienyldithiocarboxy-late have been reported recently (261). 

Fe(Et2dtc)3]BF4 has the advantage that the product is completely free from by-products and is isolable in yields of 90%. The relationship between Ei,2 values and electronic structures has been described in terms of Ai - T2 crossover equilibrium (273). The rate of e transfer between [Fe(Me2dtc)3] and [Fe(Me2dtc>3]BF4 has been measured by H-NMR, line-broadening experiments (275). Mossbauer-spectral data have been published (276) for a series of (R2dtc) complexes of iron(IV). 

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