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UO2
Selected AbstractsBioavailability and microbial adaptation to elevated levels of uranium in an acid, organic topsoil forming on an old mine spoilENVIRONMENTAL TOXICOLOGY & CHEMISTRY, Issue 8 2007Erik Jautris Joner Abstract An old mine spoil at a 19th-century mining site with considerable residues of uranium (400,800 mg U/kg) was investigated with respect to U concentrations in soil and plants and tolerance to U in the soil microbial community in order to describe the bioavailability of U. Measurements of soil fractions representing water-soluble U, easily exchangeable U, and U bound to humified organic matter showed that all fractions contained elevated concentrations of U. Plant U concentrations were only 10 times higher at the mine spoil site compared to the reference site (3 mg U/kg vs 0.3 mg U/kg), while the most easily available soil fractions contained 0.18 to 0.86 mg U/kg soil at the mine spoil. An ecotoxicity bioassay using incorporation of [3H]thymidine into the indigenous microbial communities of the two soils in the presence of increasing U concentrations showed that microorganisms at the mining site were sensitive to U but also that they had acquired a substantial tolerance toward U (EC50, the effective concentration reducing activity by 50% of UO2 -citrate was , 120 ,M as compared to 30 ,M in the reference soil). In the assay, more than 40% of the microbial activity was maintained in the presence of 1 ,M UO2-citrate versus 3% in the reference soil. We conclude that U-enriched mining waste can contain sufficiently elevated concentrations of bioavailable U to affect indigenous microorganisms and that bioavailable U imposes a selection pressure that favors the development of a highly uranium-tolerant microbial community, while plant uptake of U remains low. [source] Synthesis and Characterization of 1-, 2-, and 3-Dimensional Bimetallic UO22+/Zn2+ PhosphonoacetatesEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 8 2010Karah E. Knope Abstract Four bimetallic UO22+/Zn2+ phosphonoacetates have been prepared from hydrothermal reactions of uranyl nitrate, zinc nitrate, and triethyl phosphonoacetate. These compounds, (UO2)2(PPA)2(H2O)2·Zn(H2O)6·4H2O (1), (UO2)4(PPA)2(HPPA)2·Zn(H2O)6·5H2O·(2), (UO2)2(H2O)2(PPA)2Zn(H2O)4 (3), and (UO2)2(PPA)2(HPPA)Zn2(H2O)2·3(H2O) (4), adopt 1-, 2-, and 3-dimensional architectures wherein the UO22+ cation exhibits coordination preference for the phosphonate over the carboxylate oxygen atoms. The Zn2+ metal centers show an increased degree of ligand coordination with increasing reaction temperature. At 120 °C, compounds 1 and 2 are formed. These structures are 1- and 2-dimensional, respectively, and contain fully hydrated [Zn(H2O)6]2+ cations. At 150 °C and 180 °C, the HPPA ligand displaces H2O molecules from the inner Zn2+ hydration sphere and binds to the metal centers via a ,CO2H oxygen atom in 3 and both carboxylate and phosphonate oxygen atoms in 4. The overall Zn2+ reaction can be expressed by the equation Zn(H2O)62+ + HPPA [rlarr2] Zn(H2O)5(HPPA) + H2O. Presented here are the syntheses, structures, and characterization of these materials. [source] Calculation of the electronic structure of AmO2 and Pr6O11 for XANES analysis with redox propertyINTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, Issue 12 2009Chikashi Suzuki Abstract We calculated X-ray absorption near-edge structure (XANES) of Am LIII of AmO2 and Pr LIII of Pr6O11 using the relativistic discrete-variational (DV)-X, method based on the Dirac,Slater method, and compared it with the experimental spectra. These spectra were calculated on a model of AmO2 ([AmO8]12,) and Pr6O11 ([PrO8]12,). In spite of using small cluster models, the calculated spectra were in good agreement with the experiment ones. Besides, we calculated the electronic structure of AmO2 and Pr6O11 to analyze the peak structures of XANES. From this calculation, it was found that O s, p, and f components had influence on the specific peak structures but that O d component had influence on various peak structures for AmO2 and Pr6O11. From this result, it was suggested that the change of the electronic structure of actinide 6d and O d or f was important for actinide LIII XANES corresponding to oxygen to metal ratio in the oxide nuclear fuel. On the basis of these results, we calculated the fine structures of densities of states and the transition energy from the HOMO to the white line of AmO2, UO2, and Pr6O11 and investigated redox properties of Am and U in the oxide nuclear fuel with the evaluation of validity of Pr as simulant materials of Am. © 2009 Wiley Periodicals, Inc. Int J Quantum Chem, 2009 [source] Ultrasound enhancement of dissolution kinetics of uranium oxides in supercritical carbon dioxideJOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 12 2001I Trofimov Abstract The enhanced dissolution of uranium oxides by the application of ultrasound in supercritical fluid carbon dioxide containing dissolved 4,4-trifluoro-1-(2-thienyl)-1,3-butanedione and tributyl phosphate is demonstrated. Under conditions of 60,°C and 150 atm the steady state dissolution of UO3 with sonification is increased by approximately 100%. Furthermore, the effect of adding hydrogen peroxide to the supercritical system above enables the lower oxides of uranium, UO2 and U3O8, to be extracted. © 2001 Society of Chemical Industry [source] Theoretical study of the microhydration of mononuclear and dinuclear uranium(VI) species derived from solvolysis of uranyl nitrate in waterJOURNAL OF COMPUTATIONAL CHEMISTRY, Issue 12 2010Milan On Abstract The structures and energetics of mononuclear and dinuclear uranium species formed upon speciation of uranyl(VI) nitrate, UO2(NO3)2, in water are investigated by quantum chemistry using density functional theory and the wavefunction-based methods (MP2, CCSD, CCSD(T)). We provide a discussion of the basic coordination patterns of the various mono- and dinuclear uranyl compounds [(UO2)m(X,Y)2m,1(H2O)n]+ (m = 1, 2; n = 0,4) found in a recent mass spectrometric study (Tsierkezos et al., Inorg Chem 2009, 48, 6287). The energetics of the complexation of the uranyl dication to the counterions OH, and NO3, as well as the degradation of the dinuclear species were studied by reference to a test set of 16 representative molecules with the MP2 method and the B3LYP, M06, M06-HF, and M06-2X DFT functionals. All DFT functionals provide structures and energetics close to MP2 results, with M06 family being slightly superior to the standard B3LYP functional. © 2010 Wiley Periodicals, Inc. J Comput Chem 2010 [source] Dispersion in the Mott insulator UO2: A comparison of photoemission spectroscopy and screened hybrid density functional theory,JOURNAL OF COMPUTATIONAL CHEMISTRY, Issue 13 2008Lindsay E. Roy Abstract We present a comparison between the screened hybrid density functional theory of Heyd, Scuseria, and Enzerhof (HSE06) and high-resolution photoemission (PES) measurement on a single crystal of UO2. Angle-resolved photoemission data show a slight dispersion in the f -orbital derived bands in good agreement with the HSE band structure. The effect of spin-orbit coupling on the HSE band gap has also been calculated and found to be negligible. © 2008 Wiley Periodicals, Inc. J Comput Chem, 2008 [source] Raman spectroscopic study of the uranyl mineral pseudojohannite Cu6.5[(UO2)4O4(SO4)2]2(OH)5·25H2OJOURNAL OF RAMAN SPECTROSCOPY, Issue 12 2009Ray L. Frost Abstract Raman spectra of pseudojohannite were studied and related to the structure of the mineral. Observed bands were assigned to the stretching and bending vibrations of (UO2)2+ and (SO4)2, units and of water molecules. The published formula of pseudojohannite is Cu6.5(UO2)8[O8](OH)5[(SO4)4]·25H2O. Raman bands at 805 and 810 cm,1 are assigned to (UO2)2+ stretching modes. The Raman bands at 1017 and 1100 cm,1 are assigned to the (SO4)2, symmetric and antisymmetric stretching vibrations. The three Raman bands at 423, 465 and 496 cm,1 are assigned to the (SO4)2,,2 bending modes. The bands at 210 and 279 cm,1 are assigned to the doubly degenerate ,2 bending vibration of the (UO2)2+ units. UO bond lengths in uranyl and OH···O hydrogen bond lengths were calculated from the Raman and infrared spectra. Copyright © 2009 John Wiley & Sons, Ltd. [source] Raman spectroscopic study of the uranyl phosphate mineral dumontite Pb2 [(UO2)3O2(PO4)2]·5H2 OJOURNAL OF RAMAN SPECTROSCOPY, Issue 6 2009Ray L. Frost Abstract Raman spectra of dumontite were measured at 298 and 77 K. Observed bands were attributed to the stretching and bending vibrations of uranyl and phosphate units and OH stretching vibrations of water molecules. U,O bond lengths in uranyls and approximate O,H···O bond lengths were calculated. The values of the U,O bond lengths are in agreement with the data from the single crystal structure analysis of dumontite. Copyright © 2008 John Wiley & Sons, Ltd. [source] Raman spectroscopic study of the mineral guilleminite Ba(UO2)3(SeO3)2(OH)4·3H2OJOURNAL OF RAMAN SPECTROSCOPY, Issue 4 2009Ray L. Frost Abstract The Raman spectrum of the mineral guilleminite Ba[(UO2)3O2(SeO3)2](H2O)3 was studied and complemented by the infrared spectrum of this mineral. Both spectra were interpreted and compared with the spectra of marthozite, larisaite, haynesite and piretite, all of which should have the same phosphuranylite anion sheet topology. The presence of symmetrically distinct water molecules and hydrogen bonds was inferred from the spectra. This is in agreement with the crystal structural analysis of guilleminite. UO bond lengths in uranyl and OH···O hydrogen bond lengths were calculated from the Raman and/or infrared spectra of guilleminite. Copyright © 2008 John Wiley & Sons, Ltd. [source] Raman spectroscopic study of the uranyl selenite mineral marthozite Cu[(UO2)3(SeO3)2O2]·8H2OJOURNAL OF RAMAN SPECTROSCOPY, Issue 10 2008Ray L. Frost Abstract The mineral marthozite, a uranyl selenite, has been characterised by Raman spectroscopy at 298 K. The bands at 812 and 797 cm,1 were assigned to the symmetric stretching modes of the (UO2)2+ and (SeO3)2, units, respectively. These values gave the calculated UO bond lengths in uranyl of 1.799 and/or 1.814 Å. Average UO bond length in uranyl is 1.795 Å, inferred from the X-ray single crystal structure analysis of marthozite by Cooper and Hawthorne. The broad band at 869 cm,1 was assigned to the ,3 antisymmetric stretching mode of the (UO2)2+ (calculated UO bond length 1.808 Å). The band at 739 cm,1 was attributed to the ,3 antisymmetric stretching vibration of the (SeO3)2, units. The ,4 and the ,2 vibrational modes of the (SeO3)2, units were observed at 424 and 473 cm,1. Bands observed at 257, and 199 and 139 cm,1 were assigned to OUO bending vibrations and lattice vibrations, respectively. OH···O hydrogen bond lengths were inferred using Libowiztky's empirical relation. The infrared spectrum of marthozite was studied for complementation. Copyright © 2008 John Wiley & Sons, Ltd. [source] A Raman spectroscopic study of the uranyl carbonate rutherfordineJOURNAL OF RAMAN SPECTROSCOPY, Issue 11 2007Ray L. Frost Abstract The molecular structure of the uranyl mineral rutherfordine has been investigated by the measurement of its Raman spectra at 298 and 77 K and complemented with infrared spectra. The infrared spectra of the (CO3)2, units in the anti-symmetric stretching region show complexity with three sets of carbonate bands observed. This, combined with the observation of multiple bands in the (CO3)2, bending region in both Raman and IR spectra, suggests that both monodentate and bidentate (CO3)2, units are present in the structure in accordance with the X-ray crystallographic studies. Complexity is also observed in the IR spectra of (UO2)2+ anti-symmetric stretching region and is attributed to non-identical UO bonds. Both Raman and infrared spectra of the rutherfordine show the presence of both water and hydroxyl units in the structure, as evidenced by IR bands at 3562 and 3465 cm,1 (OH) and 3343, 3185 and 2980 cm,1 (H2O). Raman spectra show the presence of four sharp bands at 3511, 3460, 3329 and 3151 cm,1. Copyright © 2007 John Wiley & Sons, Ltd. [source] A Raman spectroscopic study of the uranyl selenite mineral haynesiteJOURNAL OF RAMAN SPECTROSCOPY, Issue 8 2006Ray L. Frost Abstract The mineral haynesite, a uranyl selenite, has been characterised by Raman spectroscopy at 298 and 77 K. Two bands at 811.5 and 800.2 cm,1 are assigned to the symmetric stretching modes of the (UO2)2+ and (SeO3)2, units respectively. These values give calculated UO bond lengths of 1.799 and/or 1.801 Å. The broad band at 861.8 cm,1 is assigned to the ,3 antisymmetric stretching mode of the (UO2)2+ (calculated UO bond length 1.813 Å). Additional bands are observed in the 77 K spectrum. In the spectroscopy of selenite compounds, the position of the antisymmetric stretching vibration occurs at lower wavenumbers than the symmetric stretching mode and thus the band at 740.5 cm,1 is attributed to the ,3 antisymmetric stretching vibration of the (SeO3)2, units. The ,4 and the ,2 vibrational modes of the (SeO3)2, units are observed at 418.5 and 472.1 cm,1. Bands observed at 278.3, 257.3 and 218.8 cm,1 are assigned to OUO bending vibrations. Copyright © 2006 John Wiley & Sons, Ltd. [source] Raman spectroscopy of walpurgiteJOURNAL OF RAMAN SPECTROSCOPY, Issue 5 2006Ray L. Frost Abstract Raman spectra of walpurgite, (UO2)Bi4O4 (AsO4)2·2H2O, recorded at 298 K and 77 K are presented and compared with infrared spectra of walpurgite and phosphowalpurgite. Bands connected with (UO2)2+, (AsO4)3,, and H2O stretch and bend, and BiO stretch are tentatively assigned. Hydrogen bond lengths are calculated from the wavenumbers of the H2O stretching vibrations and compared with those from the crystal structure analysis of walpurgite. Copyright © 2005 John Wiley & Sons, Ltd. [source] Linear polarization scans for resonant X-ray diffraction with a double-phase-plate configurationJOURNAL OF SYNCHROTRON RADIATION, Issue 6 2009Valerio Scagnoli An in-vacuum double-phase-plate diffractometer for performing polarization scans combined with resonant X-ray diffraction experiments is presented. The use of two phase plates enables the correction of some of the aberration effects owing to the divergence of the beam and its energy spread. A higher rate of rotated polarization is thus obtained in comparison with a system with only a single retarder. Consequently, thinner phase plates can be used to obtain the required rotated polarization rate. These results are particularly interesting for applications at low energy (e.g. 4,keV) where the absorption owing to the phase plate(s) plays a key role in the feasibility of these experiments. Measurements by means of polarization scans at the uranium M4 edge on UO2 enable the contributions of the magnetic and quadrupole ordering in the material to be disentangled. [source] Pressureless Rapid Sintering of UO2 Assisted by High-frequency Induction Heating ProcessJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 10 2008Jae Ho Yang Heat generation of uranium dioxide (UO2) powder and its pressureless rapid sintering behaviors have been studied using a high-frequency induction heating apparatus. The porous graphite housing has been used to prevent heat loss and to preheat the uranium oxides, simultaneously. At an elevated temperature, UO2 powder generated extra heat by itself. The synergism of individual heat generation between the graphite and UO2 powder could effectively heat the UO2 to the sintering temperature of 1700°C. Using this process, densification behavior of cylindrical and disk-type UO2 green pellets according to the heating rate and grain structure of sintered UO2 pellets were investigated. Rapid sintering caused a large crack around the circumference of the sintered pellet. The formation of cracks could be avoided when the heating rate or sample dimension are properly reduced. A dense and crack-free UO2 pellet with a relative density of up to 96% was produced within 5 min of the process time. The induction heat sintering process can be a potential candidate for the rapid fabrication of ceramics and composites. [source] Positron annihilation characteristics in UO2: for lattice and vacancy defects induced by electron irradiationPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 10 2007M.-F. Barthe Abstract In this work both 22Na based positron lifetime spectroscopy (PALS) and slow positron beam based Doppler annihilation-ray broadening spectrometry (SPBDB) have been used to characterize respectively the bulk and the first micron under the surface of sintered UO2 disks that have been polished and annealed at high temperature (1700 °C/24 h/ArH2). Results show the presence of negative ions that are tentatively identified to negatively charged oxygen atoms located in interstitial sites. The positron annihilation characteristics in the UO2 lattice have been determined and are equal to SL(UO2) = 0.371(5), WL(UO2) = 0.078(7), ,L(UO2) = 169 ± 1 ps. Such disks have been irradiated at room temperature with electrons and , particles at different fluences. After irradiation SPBDB and PALS measurements show the formation of U-related vacancy defects after a 2.5 MeV electrons irradiation whereas no defects are detected for an irradiation at 1 MeV. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] A new adamantanecarboxylate coordination polymer: poly[[(,3 -adamantane-1,3-dicarboxylato)aquadioxidouranium(VI)] monohydrate]ACTA CRYSTALLOGRAPHICA SECTION C, Issue 8 2010Julia A. Rusanova The title compound, {[U(C12H14O4)O2(H2O)]·H2O}n, is the first actinide complex featuring adamantanecarboxylate ligands. The metal ion possesses a pentagonal,bipyramidal UO7 coordination involving two axial oxide ligands [U,O = 1.732,(5) and 1.764,(5),Å] and five equatorial O atoms [U,O = 2.259,(5),2.494,(4),Å] of aqua and carboxylate ligands. The latter display pseudo-chelating and bridging coordination modes of the carboxylate groups that are responsible for the generation of the centrosymmetric discrete uranium,carboxylate [UO2(,- RCOO)2UO2] dimers [U...U = 5.5130,(5),Å] and their connection into one-dimensional chains. Hydrogen bonding involving two coordinated and two solvent water molecules [O...O = 2.719,(7),2.872,(7),Å] yields centrosymmetric (H2O)4 ensembles and provides noncovalent linkage between the coordination chains to generate a three-dimensional network structure. [source] Hydrogen-bonded network structures in dipyridinium, bis(2-methylpyridinium), bis(3-methylpyridinium) and bis(4-methylpyridinium) dioxidobis(oxydiacetato)uranate(VI)ACTA CRYSTALLOGRAPHICA SECTION C, Issue 3 2010Anders Lennartson Four complexes containing the [UO2(oda)2]2, anion (oda is oxydiacetate) are reported, namely dipyridinium dioxidobis(oxydiacetato)uranate(VI), (C5H6N)2[U(C4H4O5)2O2], (I), bis(2-methylpyridinium) dioxidobis(oxydiacetato)uranate(VI), (C8H8N)2[U(C4H4O5)2O2], (II), bis(3-methylpyridinium) dioxidobis(oxydiacetato)uranate(VI), (C8H8N)2[U(C4H4O5)2O2], (III), and bis(4-methylpyridinium) dioxidobis(oxydiacetato)uranate(VI), (C8H8N)2[U(C4H4O5)2O2], (IV). The anions are achiral and are located on a mirror plane in (I) and on inversion centres in (II),(IV). The four complexes are assembled into three-dimensional structures via N,H...O and C,H...O interactions. Compounds (III) and (IV) are isomorphous; the [UO2(oda)2]2, anions form a porous matrix which is nearly identical in the two structures, and the cations are located in channels formed in this matrix. Compounds (I) and (II) are very different from (III) and (IV): (I) forms a layered structure, while (II) forms ribbons. [source] Poly[[[diaquadioxouranium(VI)]-,3 -nitriliotriacetato-,3O:O,:O,,] trihydrate]ACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2006Mikhail S. Grigoriev The basic units in the structure of the title compound, {[UO2(C6H7NO6)(H2O)2]·3H2O}n, are ribbons in which every UO22+ cation is coordinated in a monodentate manner to three tridentate-bridging nitriliotriacetate dianions. Hydrogen bonds bind the ribbons into a three-dimensional structure. [source] The Rb analogue of grimselite, Rb6Na2[(UO2)(CO3)3]2(H2O)ACTA CRYSTALLOGRAPHICA SECTION C, Issue 3 2004Karrie-Ann Hughes Kubatko The crystal structure of the Rb analogue of grimselite, rubidium sodium uranyl tricarbonate hydrate, Rb6Na2[(UO2)(CO3)3]2(H2O), consists of a uranyl hexagonal bipyramid that shares three non-adjacent equatorial edges with carbonate triangles, resulting in a uranyl tricarbonate cluster of composition [(UO2)(CO3)3)]. These uranyl tricarbonate clusters form layers perpendicular to [001] and are interconnected by NaO8 polyhedra. The title compound is isostructural with grimselite, with a reduced occupancy of the H2O site (25% versus 50% in grimselite). [source] ChemInform Abstract: Sodium Trinitratouranylate(VI) Na[UO2(NO3)3].CHEMINFORM, Issue 31 2010Tobias Baecker Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: An ab initio Theoretical Study of the Electronic Structure of UO2+ and [UO2(CO3)3]5- .CHEMINFORM, Issue 19 2009Fernando Ruiperez Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: [H2bipy]2 [(UO2)6Zn2(PO3OH)4 (PO4)4]×H2O: An Open-Framework Uranyl Zinc Phosphate Templated by Diprotonated 4,4,-Bipyridyl.CHEMINFORM, Issue 51 2008Yaqin Yu Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: A New Uranyl Niobate Sheet in the Cesium Uranyl Niobate Cs9 [(UO2)8O4(NbO5) (Nb2O8)2].CHEMINFORM, Issue 32 2008S. Saad Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: First Identification and Thermodynamic Characterization of the Ternary U(VI) Species, UO2(O2)(CO3)24- , in UO2,H2O2,K2CO3 Solutions.CHEMINFORM, Issue 27 2008George S. Goff Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] One-Dimensional Array of Two- and Three-Center Cation,Cation Bonds in the Structure of Li4 [(UO2)10O10(Mo2O8)].CHEMINFORM, Issue 52 2007Evgeny V. Alekseev Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Hydrothermal Synthesis, Crystal Structure, and Characterization of a New Pseudo-Two-Dimensional Uranyl Oxyfluoride, [N(C2H5)4]2 [(UO2)4(OH2)3F10].CHEMINFORM, Issue 50 2007Kang Min Ok Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] K2[(UO2)As2O7] , The First Uranium Polyarsenate.CHEMINFORM, Issue 35 2007Evgeny V. Alekseev Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Expanding the Crystal Chemistry of Actinyl Peroxides: Open Sheets of Uranyl Polyhedra in Na5 [(UO2)3(O2)4(OH)3] (H2O)13.CHEMINFORM, Issue 44 2006Karrie-Ann Kubatko Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Low-Dimensional Structural Units in Amine-Templated Uranyl Oxoselenates(VI): Synthesis and Crystal Structures of [C3H12N2] [(UO2)(SeO4)2(H2O)2] (H2O) (I), [C5H16N2]2 [(UO2)(SeO4)2(H2O)] (NO3)2 (II), [C4H12N] [(UO2)(SeO4)(NO3)] (III), and [C4H14N2] [(UO2)(SeO4)2(H2O)] (IV).CHEMINFORM, Issue 47 2005Sergey V. Krivocochev Abstract For Abstract see ChemInform Abstract in Full Text. [source] | |||||||||||||||||||||||||