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AbstractAbstract
[en] The behavior of Am in acidic and basic solutions containing the Fe(CN)3-6/Fe(CN)4-6 redox system is studied. In mineral acids, K3Fe(CN)6 and Am(III) form the poorly soluble compound AmFe(CN)6, which with time undergoes a change owing to radiolytic reduction of Fe(CN)3-6 to Fe(CN)4-6. In basic solutions of K3Fe(CN)6, Am(III) is oxidized to AmO+2, forming the soluble complex (AmO2)3Fe(CN)6, which gradually decomposes to produce the solid double hydroxide Na2AmO2(OH)3·nH2O. An Am(IV) hydroxide is formed if [Am] and [K3Fe(CN)6] are equal
Source
Translated from Radiokhimiya; 35: No. 5, 68-73(Sep-Oct 1993).
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Serezhkin, V.N.; Serezhkina, L.B.
20. International Chugaev conference on coordination chemistry. Summary of reports2001
20. International Chugaev conference on coordination chemistry. Summary of reports2001
AbstractAbstract
No abstract available
Original Title
Novye metody kristallokhimicheskogo analiza neorganicheskikh i koordinatsionnykh soedinenij
Primary Subject
Source
Rossijskaya Akademiya Nauk, Otdelenie Fizikokhimii i Tekhnologii Neorganicheskikh Materialov, Sektsiya Koordinatsionnoj Khimii Nauchnogo Soveta po Neorganicheskoj Khimii, Moscow (Russian Federation); RAN, Inst. Obshchej i Neorganicheskoj Khimii im. N.S. Kurnakova, Moscow (Russian Federation); Ministerstvo Obrazovaniya Rossijskoj Federatsii, Moscow (Russian Federation); Severo-Kavkazskij Nauchnyj Tsentr Vysshej Shkoly, Rostov-na-Donu (Russian Federation); Rostovskij Gosudarstvennyj Univ., Rostov-na-Donu (Russian Federation); Rossijskoe Khimicheskoe Obshchestvo im. D.I. Mendeleeva, Moscow (Russian Federation); Rossijskij Fond Fundamental'nykh Issledovanij (RFFI), Moscow (Russian Federation); Federal'naya Tselevaya Programma Integratsiya, Moscow (Russian Federation); Mezhdunarodnaya Assotsiatsiya INTAS, Moscow (Russian Federation); Moskovskij Komitet po Nauke i Tekhnologiyam, Moscow (Russian Federation); 560 p; ISBN 5-9275-0086-2;
; 2001; p. 40-42; 20. International Chugaev conference on coordination chemistry; 20. Mezhdunarodnaya Chugaevskaya konferentsiya po koordinatsionnoj khimii; Rostov-na-Donu (Russian Federation); 25-29 Jun 2001

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Karraker, D.G.; Stone, J.A.
Du Pont de Nemours (E.I.) and Co., Aiken, S.C. (USA). Savannah River Lab1977
Du Pont de Nemours (E.I.) and Co., Aiken, S.C. (USA). Savannah River Lab1977
AbstractAbstract
[en] The Moessbauer spectra of complexes between Np(V) and Cr(III) or Rh(III) ions absorbed on cation exchange resin were measured at 4.20K with a constant acceleration Moessbauer spectrometer. The spectrum of the Np(V)-Cr(III) complex showed a strong magnetic splitting with Moessbauer parameters of g0μ/sub N/H/sub eff/ 9.91 cm/sec, 1/4 eqQ = -2.9 cm/sec, and delta = 1.69 cm/sec. The spectrum of the Np(V)-Rh(III) complex was dominated by quadrupole splitting with a minor fraction showing magnetic hyperfine structure. The results of these measurements are consistent with the suggested structure of the complexes--substituting NpO2+ in the transition metal ion coordination sphere--and the magnetic properties of paramagnetic Cr(III) ion (3d3, high spin) and diamagnetic Rh(III) ion
Source
1977; 10 p; American Chemical Society meeting; Chicago, Illinois, United States of America (USA); 29 Aug - 2 Sep 1977; CONF-770814--2; Available from NTIS., PC A02/MF A01
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Hilaire, S.; Guillaumont, D.; Gutierrez, F.; Wastin, F.; Colineau, E.; Gouder, T.; Berthet, JC.; Meyer, D.; Simoni, E.
DEN Marcoule DRCP/SCPS/LCAM, Bagnols sur Ceze (France); EC-JRC-ITU Karlsruhe (Germany); DSM/SAC/DRECAM/SCM, IPN Paris XI, Orsay (France)2004
DEN Marcoule DRCP/SCPS/LCAM, Bagnols sur Ceze (France); EC-JRC-ITU Karlsruhe (Germany); DSM/SAC/DRECAM/SCM, IPN Paris XI, Orsay (France)2004
AbstractAbstract
[en] Early actinides (U, Np, Pu, Am) show a particular linear bond actinyl type structure in higher oxidation state. The multiple bond nature of this chemical pattern contributes to a drastic diminution of the charge at the metallic core inducing a strong stabilisation of these high oxidation states. The potential participation of the early actinide 5f orbitals in the valence molecular shell is supposed to be one of the most important engines of this chemical specificity. In order to progress in the comprehension of this behaviour, a study of the electronic and the geometric structure of some actinyl complexes with different electronic configuration is undertaken using theoretical and experimental approaches. (authors)
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2004; 4 p; 2. Atalante 2004 conference: Advances for future nuclear fuel cycles; Nimes (France); 21-24 Jun 2004; 2 refs., 4 figs.
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Stoyer, N.J.; Seaborg, G.T.
Lawrence Berkeley Lab., CA (United States); Lawrence Livermore National Lab., CA (United States). Funding organisation: USDOE, Washington, DC (United States); Department of Education, Washington, DC (United States)1994
Lawrence Berkeley Lab., CA (United States); Lawrence Livermore National Lab., CA (United States). Funding organisation: USDOE, Washington, DC (United States); Department of Education, Washington, DC (United States)1994
AbstractAbstract
[en] The +5 oxidation state of U, Np, Pu, and Am is a linear dioxo cation (AnO2+) with a formal charge of +1. These cations form complexes with a variety of other cations, including actinide cations. Other oxidation states of actinides do not form these cation-cation complexes with any cation other than AnO2+; therefore, cation-cation complexes indicate something unique about AnO2+ cations compared to actinide cations in general. The first cation-cation complex, NpO2+·UO22+, was reported by Sullivan, Hindman, and Zielen in 1961. Of the four actinides that form AnO2+ species, the cation-cation complexes of NpO2+ have been studied most extensively while the other actinides have not. The only PuO2+ cation-cation complexes that have been studied are with Fe3+ and Cr3+ and neither one has had its equilibrium constant measured. Actinides have small molar absorptivities and cation-cation complexes have small equilibrium constants; therefore, to overcome these obstacles a sensitive technique is required. Spectroscopic techniques are used most often to study cation-cation complexes. Laser-Induced Photacoustic Spectroscopy equilibrium constants for the complexes NpO2+·UO22+, NpO2+·Th4+, PuO2+·UO22+, and PuO2+·Th4+ at an ionic strength of 6 M using LIPAS are 2.4 ± 0.2, 1.8 ± 0.9, 2.2 ± 1.5, and ∼0.8 M-1
Source
Dec 1994; 100 p; CONTRACT AC03-76SF00098; W-7405-ENG-48; DEPARTMENT OF EDUCATION FELLOWSHIP GRANT P200A10143; Also available from OSTI as DE95008491; NTIS; US Govt. Printing Office Dep; Thesis (Ph.D.).
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Brown, P.L.; Wanner, H.
Nuclear Energy Agency, 75 - Paris (France)1987
Nuclear Energy Agency, 75 - Paris (France)1987
AbstractAbstract
[en] Formation constants are listed for standard conditions, i.e., 298.15K (250C), 105 Pa, and zero ionic strength for a number of species containing selected elements (Am, Cs, Np, Pa, Pb, Pd, Pu, Ra, Sn, Sr, Tc, Th, U) and ligands (hydroxide, fluoride, chloride, bromide, iodide, iodate, sulphate, ammonia, nitrate, hydrogen phosphate, dihydrogen phosphate, carbonate, bicarbonate, oxalate, formate, thiocyanate, acetate, benzoate, catecholate, ethylenediamine, glycinate, glycollate and phenolate) that have been considered important for nuclear technology. 16 refs
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1987; 102 p
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Numerical Data
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AMERICIUM COMPLEXES, CESIUM COMPLEXES, CHEMICAL REACTIONS, IODINE COMPLEXES, LEAD COMPLEXES, LIGANDS, NEPTUNYL COMPLEXES, PALLADIUM COMPLEXES, PLUTONYL COMPLEXES, PROTACTINIUM COMPLEXES, RADIUM COMPLEXES, STABILITY, STRONTIUM COMPLEXES, TECHNETIUM COMPLEXES, THEORETICAL DATA, THERMODYNAMIC ACTIVITY, THORIUM COMPLEXES, TIN COMPLEXES, URANYL COMPLEXES
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Fugate, G.; Feil-Jenkins, J.F.; Sullivan, J.C.; Nash, K.L.
Argonne National Lab., IL (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1996
Argonne National Lab., IL (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1996
AbstractAbstract
[en] Rates of complex formation and dissociation in NpO2+- Chlorophosphonazo III (2,7-bis(4-chloro-2-phosphonobenzeneazo)-1,8- dihydroxynapthalene-3,6-disulfonic acid)(CLIII) were investigated by stopped-flow spectrophotometry. Also, limited studies were made of the rates of reaction of La3+, Eu3+, Dy3+, and Fe3+ with CLIII. Rate determining step in each system is an intramolecular process, the NpO2+-CLIII reaction proceeding by a first order approach to equilibrium in the acid range from 0.1 to 1.0 M. Complex formation occurs independent of acidity, while both acid dependent and independent dissociation pathways are observed. Activation parameters for the complex formation reaction are ΔH=46.2±0.3 kJ/m and ΔS=7± J/mK (I=1.0 M); these for the acid dependent and independent dissociation pathways are ΔH=38.8±0.6 kJ/m, ΔS=-96±18 J/mK, ΔH=70.0± kJ/m, and ΔS=17±1 J/mK, respectively. An isokinetic relationship is observed between the activation parameters for CLIII complex formation with NpO2+, UO22+, Th4+, and Zr4+. Rates of CLIII complex formation reactions for Fe3+, Zr4+, NpO2+, UO22+, Th4+, La3+, Eu3+, and Dy3+ correlate with cation radius rather than charge/radius ratio
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Dec 1996; 22 p; CONTRACT W-31-109-ENG-38; Also available from OSTI as DE97002721; NTIS; US Govt. Printing Office Dep
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AbstractAbstract
[en] Chelates of pyridine azopyrazolin-5-one derivatives with Zr(IV), La(III), Y(III) and UO22+ have been prepared and characterized on the basis of microanalysis, electronic, IR, 1H NMR spectra. The thermogravimetric analysis confirms the presence of coordinated water molecules. The 1:1 and 1:2 (Mn+:L) ratios are suggested on the basis of spectrophotometric and conductometric data. It is concluded that the ligand L1 and L3 can act, as neutral bidentate ligands while L2 acts as monobasic bidentate. All complexes are thermally stable up to ∼ 2000C
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Serezhkina, L.B.; Demchenko, E.A.; Krivopalova, M.A.; Serezhkin, V.N.
Second Russian conference on radiochemistry. Abstracts1997
Second Russian conference on radiochemistry. Abstracts1997
AbstractAbstract
No abstract available
Original Title
Poliehdry Voronogo-Dirikhle atomov U ili Np pravilo 18 ehlektronov v kompleksakh uranila i neptunoila
Source
Rossijskaya Akademiya Nauk, Moscow (Russian Federation); Ministerstvo Rossijskoj Federatsii po Atomnoj Ehnergii, Moscow (Russian Federation); Mezhvedomstvennyj Nauchnyj Sovet po Radiokhimii pri Prezidiume Rossijskoj Akademii Nauk, Moscow (Russian Federation); Gosudarstvennyj Nauchnyj Tsentr Rossijskoj Federatsii Nauchno-Issledovatel'skij Inst. Atomnykh Reaktorov, Dimitrovgrad (Russian Federation); 338 p; ISBN 8-5-165-356-6;
; 1997; p. 26; 2. Russian conference on radiochemistry; Vtoraya Rossijskaya konferentsiya po radiokhimii; Dimitrovgrad (Russian Federation); 27-31 Oct 1997; Short communication, 1 ref.

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AbstractAbstract
[en] The single-crystal X-ray structure of (NpO2)2C3H2O4·3H2O (I) is solved (Siemens P3/PC, graphite monochromator, Mo Kα-radiation). The unit-cell parameters are a = 6.596(1), b = 8.320(1), c = 10.308(2) angstrom β = 90.24(2)degrees, Z = 2, space group P21, dcalc = 4.07 g/cm3, 2239 reflections with I > 3σ(I), R = 0.049, Rw = 0.073. The crystal structure of I is constructed of NpO2+, C3H2O2-4, coordinated water, and water of crystallization. The two crystallographically unique NpO2 groups (Np coordination number 7, pentagonal bipyramidal coordination polyhedron) are joined into planar open-quotes squareclose quotes cationic networks in which both groups act as bidentate ligands. The malonate ion additionally joins Np atoms of one network that are bonded to each other by cation-cation (CC) interactions. The structure of I is compared to that of the previously described (NpO2)2C3H2O4·4H2O (II). The change from II (crystallized from cold solutions) to I (crystallized from hot solutions) is accompanied by the exclusion of water from the Np coordination sphere and produces a structure rearrangement with formation of new CC bonds
Source
Translated from Radiokhimiya; 35: No. 4, 31-37(Jul-Aug 1993).
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