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  • 1
    Electronic Resource
    Electronic Resource
    On the Oximine Complexes of Transition Metals: Part 110: Spectroscopic and DSC study on some [Fe(Diox·H)2L2] and [Fe(Diox)3(BOR)2] type chelates and clathrochelates (1999)
    Springer
    Journal of thermal analysis and calorimetry 57 (1999), S. 433-445 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; iron(II)-oxime complexes ; kinetic parameters ; Mössbauer spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A number of 15 [Fe(Diox#x00B7;H)2L2] type chelates and [Fe(Diox)3(BOR)2] clathrochelates (Diox#x00B7;H2 — dimethylglyoxime, glyoxime, propoxime, nyoxime, furyl-dioxime; L-pyridine, alkyl-pyridine derivatives, diethyl-phenyl-phosphine, diethyl-p-tolyl-phosphine) were obtained and characterized by means of far and middle FTIR and Mössbauer spectroscopic methods. Some structural problems were discussed on the basis of the optical data. The DSC measurements show the higher thermal stability of the clathrochelates without O—H⋯O intramolecular hydrogen bonds (with asymmetric octahedral structure), as compared to the [Fe(Diox#x00B7;H)2L2] trans, symmetric chelates containing O—H⋯O bonds. The kinetic parameters of the thermal decomposition of the complexes have been derived using the nomogram method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010155706218
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  • 2
    Electronic Resource
    Electronic Resource
    Aftereffects in zeolite‐encapsulated 57Co‐complexes (1998)
    Springer
    Hyperfine interactions 113 (1998), S. 331-339 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Tris(2,2'-bipyridyl)-57CoII and bis(2,2':6',2'-terpyridine)-57CoII complexes were synthesised in the supercages of zeolite‐Y in order to study the effect of molecular isolation on the aftereffects of the 57Co(EC)57Fe decay. As compared to the regular crystalline salts of the complex ions where, according to the emission Mössbauer spectra, the most abundant species is low‐spin FeII, the molecular isolation in the zeolite resulted in a larger fraction of low‐spin FeIII and a varying amount of high‐spin Fe2+ species. In the investigated temperature range, 20 K to 295 K, the majority of the changes was observed above 80 K. In the case of tris (2,2'-bipyridyl)-57CoII-Y, the most characteristic change occurred in valence states, while for bis (2,2':6',2'-terpyridine)-57CoII‐Y, the temperature dependence of the spin states was more prominent. The change in the low spin valence states is explained partly by donor-acceptor properties of the zeolite lattice. The variation in the high spin fraction is explained by radiation damage of the ligand sphere and/or fragmentation of the complex ion followed by incomplete recombination in the supercage. Molecular isolation itself did not seem to increase the chance of fragmentation (as a consequence of charge neutralization following Auger ionization) of these highly conjugated complex molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012640119963
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  • 3
    Electronic Resource
    Electronic Resource
    57Fe and57Co Mössbauer study of suppression of superconductivity in PrBa2Cu3O7−d (1994)
    Springer
    Hyperfine interactions 93 (1994), S. 1621-1625 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 57Fe and57Co Mössbauer spectroscopy and X-ray diffractometry were used to study57Fe- and57Co-substituted PrBa2Cu3O7−d samples. Our most striking result is that the isomer shifts belonging to both Co and Fe at four- and five-coordinated Cu(1) sites in the PrBa2Cu3O7−d cuprate are significantly higher than those observed for the superconducting 1-2-3 compounds. This result is considered as being a consequence of suppression of superconductivity because the extra electrons from Pr fill in the holes in Cu-O planes due to the valence state of Pr higher than 3+ and due to hybridization of Pr-Cu-O orbitals, via the charge transfer mechanism between the Cu(2)-O planes and Cu(1)-O chains. Our results give evidence of the existence of the charge transfer mechanism between the planes and the chains, and of its important role in controlling the superconductivity with a charge reservoir behavior of the Cu(1)-O chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072918
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  • 4
    Electronic Resource
    Electronic Resource
    Nuclear Techniques in the Elucidation of Chemical Structure (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 243 (2000), S. 241-253 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The paper offers three applications of nuclear methods in the research of chemical structure. First, progress in positron annihilation spectroscopy is illustrated by a positron beamline study, which obtained results that are not available through conventional experiments. The positron beam was used for the study of Langmuir-Blodgett (LB) films containing 4-58 layers of arachidic acid and its salts. These measurements have shown that this emerging technique is capable of characterizing even such elusive systems. Second, the potential of Mössbauer spectroscopy to answer current challenges of solid state chemistry are shown in a study on perovskites of recent interest. 151Eu Mössbauer spectroscopy was used to study the effect of Pr substitution in EuBa2Cu3O7-δ. It was shown that the introduction of Pr into the rare earth site as well as into the Ba site results in the appearance of extra electrons both in the copper oxide planes and at the 4f shell of Eu cations. The observed effects were explained by the hole filling effect of Pr. Finally, a survey is presented on the recently developed techniques for nuclear resonant scattering of synchrotron radiation, an exciting and very rapidly developing extension to conventional Mössbauer spectroscopy. An interesting new result is that nuclear inelastic scattering experiments performed on solutions of 57Fe complexes show contribution from vibrations rather than from diffusion to the inelastic spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006716708476
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  • 5
    Electronic Resource
    Electronic Resource
    Nuclear Inelastic Scattering of Synchrotron Radiation on Solutions of 57Fe Complexes (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 246 (2000), S. 97-100 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Nuclear inelastic resonant scattering of synchrotron radiation was applied to the study solutions of 57Fe complexes. In order to reveal different inelastic contributions solutions of two different 57Fe complexes of different molecular dimensions with solvents of substantially different viscosities were studied. We argue that the only former experiment available in the literature overestimates the role of the diffusivity in affecting the spectrum. The first direct observation of an intramolecular vibrational transition assisting the nuclear resonance absorption in a liquid is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006785115244
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  • 6
    Electronic Resource
    Electronic Resource
    Sterical effects of encapsulation on some cobalt complexes built up in zeolite Y – A Mössbauer emission spectroscopy study (2000)
    Springer
    Hyperfine interactions 126 (2000), S. 163-167 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer emission spectroscopy revealed effects of encapsulation on 2,2′-bipyridine and 1,10-phenantroline complexes of 57Co2+ synthesized in the supercages of zeolite Y. The tris coordinated phenantroline complex, unexpectedly, did not form in the supercage due to the blocking effect of the cage walls. The spectra of the tris bipyridine complex did not show the high spin state of the nucleogenic iron(II) complex. This is attributed to the very short lifetime of this state destabilized by the misfit to the volume of the zeolite cage. The relaxation rate was estimated and compared with lifetimes measured on the complex embedded in other matrices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012613332761
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  • 7
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    Organotin(IV) complexes of polyhydroxyalkyl carboxylic acids and some related ligands (2004)
    Springer
    Details
    Publication Date: 2004-01-01
    Print ISSN: 0236-5731
    Electronic ISSN: 1588-2780
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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