Search results for "MÖSSBAUER SPECTROSCOPY"

Antimony-121 mössbauer and infrared spectral study on halophenylantimonate(III) Compounds

1981

Abstract The synthesis and the 121 Sb Mossbauer and infrared spectra of halophenylantimonates(III) M[PhSbX 3 ] (M  Me 4 N, Ph 4 As;X  Cl, Br, I) are reported, and the spectral data are discussed and compared with those of SbX 4 and other related systems. The results are in accord with the participation of the antimony 5s electrons in the SbPh bond. In the interpretation of the electric field gradient, the contributions to V zz from both the lone pair and the SbPh bond electron densities are assumed to be dominant.

Complexes of organometallic compounds

1974

Abstract Novel complexes RClSntrid, where R is Me, Ph, n-Oct, and trid 2− are dianions of tridentate “planar” ligands with ONO and SNO donor atoms, were synthesized and investigated in the solid state by infrared and Mossbauer spectroscopy. Possible configurations are discussed; polymeric trigonal bipyramidal structures seem to occur, although five-coordinated monomers as well as octahedral dimers (via oxygen or sulfur bridges) are not excluded.

Complexes of Tin(IV) with Tridentate Ligands M�SSBAUER, Infrared, and Solution Phase Studies

1974

The configuration in the solid state and in solution phase of complexes of SuIV wit,li tridentate “planar” ligands, Sn(trid)2 and HNEt3Cl3 Sntrid, have been investigated by infrared and MOSSBAUER spectroscopy, as well as by osmometry, conductivity, and electronic and PMR spectroscopy. The presence of monomeric Sn(trid)2 and ionic [HNEt] [Cl3Sn trid−] species has been inferred. Octahedral type configurations are advanced for both classes of compounds. Komplexe des Zinn (IV) mit dreizahigen Liganden. Mossbauer- und IR-Spektren sowie Untersuchungen von Losungen Die Struktur von SnIV-Komplexen mit dreizahnigen “planaren” Liganden, Sn(trid)2 und HNEt3Cl2Sntrid, wurde in fester Phase und in Losun…

Infrared and M�SSBAUER spectroscopic studies on complexes of Hal2SnIV moieties with tridentate ligands

1975

Novel complexes hal2Sntrid, where hal Cl, Br, and trid2− are dianions of „planar” tridentate ligands with ONO and SNO donor basic atoms, were synthesized and structurally investigated in the solid state mainly by far infrared and MOSSBAUER spectroscopy. Possible configurations were advanced and discussed, and it was concluded that the most probable is a monomeric trigonal bipyramidal structure for all compounds, although polymers, or dimers with O or Cl bridges, were not a priori excluded, in a special way for Br2Sntrid. Infrarot- und MOSSBAUER-spektroskopische Untersuchungen an Komplexen von Hal2SnIV mit dreizahnigen Liganden Neue Komplexverbindungen von Typ hal2Sntrid werden dargestellt (…

Complexes of organometallic compounds. XLVII. Synthesis of dimethyltin(IV) adenosinate and its characterization by Mössbauer and infrared spectroscopy

1977

Wet Chemical Synthesis and a Combined X-ray and Mössbauer Study of the Formation of FeSb2 Nanoparticles

2011

Understanding how solids form is a challenging task, and few strategies allow for elucidation of reaction pathways that are useful for designing the synthesis of solids. Here, we report a powerful solution-mediated approach for formation of nanocrystals of the thermoelectrically promising FeSb(2) that uses activated metal nanoparticles as precursors. The small particle size of the reactants ensures minimum diffusion paths, low activation barriers, and low reaction temperatures, thereby eliminating solid-solid diffusion as the rate-limiting step in conventional bulk-scale solid-state synthesis. A time- and temperature-dependent study of formation of nanoparticular FeSb(2) by X-ray powder dif…

Spin crossover in iron(II) complexes: Recent advances

2009

In this review article, several representative multifunctional SCO materials exhibiting interplay/synergy between the spin transition and magnetic coupling or liquid crystalline properties together with the present pioneering works on nano-structuration of SCO materials are illustrated. As the Mossbauer spectroscopy has been decisive in the study of the physical properties of these multifunctional materials, special attention is given to their corresponding Mossbauer investigations.

Five-Coordinate Complexes [FeX(depe)2]BPh4, X = Cl, Br:  Electronic Structure and Spin-Forbidden Reaction with N2

2002

The bonding of N(2) to the five-coordinate complexes [FeX(depe)(2)](+), X = Cl (1a) and Br (1b), has been investigated with the help of X-ray crystallography, spectroscopy, and quantum-chemical calculations. Complexes 1a and 1b are found to have an XP(4) coordination that is intermediate between square-pyramidal and trigonal-bipyramidal. Mössbauer and optical absorption spectroscopy coupled with angular overlap model (AOM) calculations reveal that 1a and 1b have (3)B(1) ground states deriving from a (xz)(1)(z(2))(1) configuration. The zero-field splitting for this state is found to be 30-35 cm(-1). In contrast, the analogous dinitrogen complexes [FeX(N(2))(depe)(2)](+), X = Cl (2a) and Br (…

Complexes of diorganotin(IV) dihalides with diphosphoryl compounds and their Mössbauer spectra

1993

Unprecedented multiple electronic spin transition in hepta- and nonanuclear complex compounds observed by Mössbauer spectroscopy

2005

Abstract The precursor [Fe(III)(5L)Cl](5LH2 = N,N′-bis(1-hydroxy-2- benzyliden)-1,7-diamino-4-azaheptane) is a high-spin (S = 5/2) complex. This precursor combined with the bridging units [Fe(II)(CN)6]4−, [Co(III)(CN)6]3−, and [Mo(CN)8]4− yields starshaped hepta- and nonanuclear clusters, [Fe(II){(CN)Fe(III)(5L)}6]Cl2, [Co(III){(CN)Fe(III)(5L)}6]Cl3 and [Mo(IV){(CN)Fe(III)(5L)}8]Cl4. The starshaped compounds are high-spin systems at room temperature. On cooling to 20 K some of the iron(III) centers in the Co(III)- and Mo(IV)-star switch to the low-spin state as proven by Mossbauer spectroscopy, i.e., multiple electronic transitions, while the Fe(II)-star remains in the high-spin state.