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AbstractAbstract
[en] The stochastic theory of Moessbauer line shapes is formulated in a fashion which allows the evaluation of the spectral shapes for absorbers of arbitrary thickness, texture, and an anisotropic Lamb-Moessbauer factor. The results are specialized to a two-state-relaxation model of fluctuating electric hyperfine interaction in the case of an absorber of axially symmetric texture. The formalism is applied to the line shape analysis of Moessbauer spectra of a textured sample of the spin-crossover complex [Fe(mtz)6](PF6)2 (mtz = 1-methyltetrazole). It is found that between 185 and 240 K the rate constants for the HS → LS conversion are temperature independent, whereas an Arrhenius behaviour is found for the LS → HS conversion
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[en] Specific nonvalent interactions (SNI) with participation chalcogene atoms in structures on the basis of (μ3-X)(μ2-X2)3M34+ and (μ3-X)(μ2-X)3M34+ (M = Mo, W; X = O, S, Se) were considered. SNI classification was carried out. The determining role of SNI during crystal structure formation was shown
Original Title
Spetsificheskie nevalentnye vzaimodejstviya v strukturakh klasterov na osnove M3X74+ i M3X44+ (M = Mo, W; X = O, S, Se)
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[en] Binuclear molybdenum(0) carbonyl complexes were synthesized based on naphthophosphacyclophanes containing a 1,6-dihydroxynaphthalene fragment and diethylamide linkers. The physicochemical and spectral characteristics of the synthesized coordination systems were studied.
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Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA)
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[en] The modern state of the theory of the mutual influence of ligands (MIL) has been analyzed and conclusions from the different MIL models have been compared with experimental data concerning the central atom-ligand bond lengths. It is shown that in complexes of both transition and main group elements the predominant type of the directed influence of ligands is the trans-influence, though in some cases, especially for main group element complexes, the MIL regularities are of a more complicated character. (author)
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Wroclaw Univ. (Poland); p. 209-234; 1979; p. 209-234; Polish Scientific Publishers; Warszawa (Poland); 9. International Summer School on coordination chemistry; Karpacz-Bierutowice (Poland); 8 - 14 Jun 1975
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No abstract available
Original Title
Estrutura eletronica e interacoes hiperfinas na espectroscopia Moessbauer para a serie isoeletronica [Fe(CN)5X]sup(-3+m), Xsup(m)=CN-, NO+, CO e N2
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32. Annual Meeting of the Brazilian Society for the Advancement of Science; Rio de Janeiro, Brazil; 6 - 12 Jul 1980; Published in summary form only.
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Cienc. Cult. (Sao Paulo) Supl; v. 32(7); p. 433
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[en] The method of qualitative comparison of effective charges of metal atoms in transition element complexes on the basis of comparison of metal oxidation degree and electronegativity of metals and ligands is described. Examples of influence of effective charge of metal atom on the structure of a number of complexes of rhenium, technetium, molybdenum and some other transition elements are given
[ru]
Original Title
Vliyanie ehffektivnogo zaryada atoma metalla na atomnoe stroenie kompleksov nekotorykh perekhodnykh ehlementov
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Koordinatsionnaya Khimiya; ISSN 0132-344X;
; v. 7(5); p. 659-673

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No abstract available
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1973; 135 p; University Microfilms Order No. 73-27,412.; Thesis (Ph. D.).
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Report
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[en] Mixed-valence μ-phenolate-bis(μ-carboxylate) diiron(II, III) complex [Fe2(bpmp)(ppa)2](BF4)2 (1) is prepared. The temperature dependence of the Moessbauer spectra of the complex 1 is measured. The Moessbauer parameters of the complex 1 show the unusual increase of isomer shift and quadrupole splitting with an increase in temperature. The spectra are explained by the dynamic electronic states in which the valence states of two iron atoms in a molecule are 2.2 and 2.8 on the Moessbauer time scale at 293 K. The single crystal X-ray structure of the complex 1 is determined at 133 K. The complex 1 crystallizes in the triclinic space group P-bar 1. Two iron atoms in the complex 1 are crystallographycally inequivalent. (author)
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14 refs.
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Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 272(3); p. 651-656

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No abstract available
Original Title
Troca isotopica no estado solido entre componentes normais da rede cristalina - um estudo comparativo
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35. Annual Meeting of the Brazilian Society for the Advancement of Science; Belem, PA (Brazil); 6-13 Jul 1983; Published in summary form only.
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Cienc. Cult. (Sao Paulo) Supl; v. 35(7); p. 365
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[en] The rhenium complexes is a radiopharmaceutical in nuclear medicine. The stability of rhenium compounds in crystal is studied based on the reformed packing model. The structural data of 406 rhenium compounds containing no metal-metal bonds are collected. The sums of their solid angle factor (SAF) are calculated and statistically analysed. It turns out that the stability center is 0.951 +- 0.084. The value of 2σ is comparable to the SAF of a common coordinating atom. This result means that the packing of the coordinating atoms around the central atom is restricted by geometrical factors
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