Sulfur-substituted uranyl stabilized by fluoride ligands: matrix preparation of U(O)(S)F2via oxidation of U(0) by SOF2

2020 ◽  
Vol 56 (50) ◽  
pp. 6782-6785
Author(s):  
Rui Wei ◽  
Xiuting Chen ◽  
Yu Gong
Keyword(s):  
Uranyl Complex ◽  
Fluoride Ligands ◽  
Matrix Preparation

A neutral sulfur-substituted uranyl complex [U(O)(S)F2] in which the SUO2+ moiety is stabilized by electron withdrawing fluoride ligands was prepared via oxidation of U(0) by SOF2 in cryogenic matrixes.

Immobilization of copper Schiff base complexes in zeolite matrix: Preparation, characterization and catalytic study

2007 ◽  
Vol 318 ◽  
pp. 89-94 ◽  
Author(s):  
Buddhadeb Dutta ◽  
Sreyashi Jana ◽  
Rajesh Bera ◽  
Pratap Kumar Saha ◽  
Subratanath Koner
Keyword(s):  
Schiff Base ◽  
Schiff Base Complexes ◽  
Matrix Preparation

scholarly journals Autonomous splicing and complementation of in vivo-assembled spliceosomes.

1989 ◽  
Vol 108 (3) ◽  
pp. 765-777 ◽  
Author(s):  
S Zeitlin ◽  
R C Wilson ◽  
A Efstratiadis
Keyword(s):  
Nuclear Extract ◽  
Physiological Concentration ◽  
Ribonucleoprotein Complexes ◽  
Matrix Bound ◽  
The Relationship ◽  
Matrix Preparation ◽  
Cell Nuclear Extract ◽  
Biochemical Features

We have used an in vivo system generating assayable amounts of a specific pre-mRNA to study the relationship between splicing and an operationally defined nuclear matrix preparation (NM). When NM is prepared by extraction of DNase I-treated nuclei with an approximately physiological concentration of KCl (0.1 M), a portion of NM-associated precursor can be spliced in vitro in the presence of ATP and Mg2+ and in the absence of splicing extract ("autonomous splicing"). We propose that the autonomous reaction, which does not exhibit a temporal lag and is half-complete in 5 min, occurs in fully assembled, matrix-bound ribonucleoprotein complexes (in vivo spliceosomes). Extraction of the NM with concentrations of KCl greater than 0.4 M eliminates autonomous splicing but leaves behind preassembled complexes that can be complemented for splicing with HeLa cell nuclear extract. The splicing complementing factor, representing one or more activities present in the nuclear extract and also in the cytoplasmic S100 fraction, is relatively heat resistant, devoid of an RNA component, and does not bind to DEAE-Sepharose in 0.1 M KCl. It exists in the nucleus in two forms; bound to autonomous spliceosomes and free in the nucleoplasm. Biochemical features of the complementation reaction, and conditions for reversible uncoupling of the two splicing steps are described and discussed.

Ratiometric colorimetric determination of coenzyme A using gold nanoparticles and a binuclear uranyl complex as optical probes

2015 ◽  
Vol 183 (2) ◽  
pp. 715-721 ◽  
Author(s):  
Rurong Wu ◽  
Lifu Liao ◽  
Shijun Li ◽  
Yanyan Yang ◽  
Xilin Xiao ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Coenzyme A ◽  
Uranyl Complex ◽  
Colorimetric Determination ◽  
Optical Probes

The reaction between thenoyltrifluoroacetone and its uranyl complex in benzene

1960 ◽  
Vol 14 (1-2) ◽  
pp. 126-127 ◽  
Author(s):  
Sigfred Peterson
Keyword(s):  
Uranyl Complex

scholarly journals Decomposition of d- and f-Shell Contributions to Uranium Bonding from the Quantum Theory of Atoms in Molecules: Application to Uranium and Uranyl Halides

Inorganics ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 88 ◽  
Author(s):  
Jonathan Tanti ◽  
Meghan Lincoln ◽  
Andy Kerridge
Keyword(s):  
Quantum Theory ◽  
Electronic Structures ◽  
Density Functional ◽  
Covalent Bond ◽  
Vibrational Frequencies ◽  
Atoms In Molecules ◽  
High Symmetry ◽  
Strong Correlations ◽  
Bond Stability ◽  
Fluoride Ligands

The electronic structures of a series of uranium hexahalide and uranyl tetrahalide complexes were simulated at the density functional theoretical (DFT) level. The resulting electronic structures were analyzed using a novel application of the Quantum Theory of Atoms in Molecules (QTAIM) by exploiting the high symmetry of the complexes to determine 5f- and 6d-shell contributions to bonding via symmetry arguments. This analysis revealed fluoride ligation to result in strong bonds with a significant covalent character while ligation by chloride and bromide species resulted in more ionic interactions with little differentiation between the ligands. Fluoride ligands were also found to be most capable of perturbing an existing electronic structure. 5f contributions to overlap-driven covalency were found to be larger than 6d contributions for all interactions in all complexes studied while degeneracy-driven covalent contributions showed significantly greater variation. σ-contributions to degeneracy-driven covalency were found to be consistently larger than those of individual π-components while the total π-contribution was, in some cases, larger. Strong correlations were found between overlap-driven covalent bond contributions, U–O vibrational frequencies, and energetic stability, which indicates that overlap-driven covalency leads to bond stabilization in these complexes and that uranyl vibrational frequencies can be used to quantitatively probe equatorial bond covalency. For uranium hexahalides, degeneracy-driven covalency was found to anti-correlate with bond stability.

Synthesis and characterization of a dipyriamethyrin–uranyl complex

2017 ◽  
Vol 53 (36) ◽  
pp. 4981-4984 ◽  
Author(s):  
James T. Brewster ◽  
Qing He ◽  
Gonzalo Anguera ◽  
Matthew D. Moore ◽  
Xian-Sheng Ke ◽  
...  
Keyword(s):  
Macrocyclic Ligand ◽  
Uranyl Complex ◽  
Synthesis And Characterization

A bench stable uranyl complex of a hexaazadipyriamethryin macrocyclic ligand has been prepared and characterized.

scholarly journals PbS - Nanoparticles Embedded in Polymer Matrix: Preparation and Characterization

2012 ◽  
Vol 1 (2) ◽  
pp. 36-39 ◽  
Author(s):  
P. K. Singh ◽  
S. K. Tomar ◽  
B. Bhattacharya
Keyword(s):  
Polymer Matrix ◽  
Pbs Nanoparticles ◽  
Matrix Preparation

Stable Pentavalent Uranyl Species and Selective Assembly of a Polymetallic Mixed-Valent Uranyl Complex by Cation-Cation Interactions

2009 ◽  
Vol 121 (45) ◽  
pp. 8629-8632 ◽  
Author(s):  
Victor Mougel ◽  
Pawel Horeglad ◽  
Grégory Nocton ◽  
Jacques Pécaut ◽  
Marinella Mazzanti
Keyword(s):  
Uranyl Complex ◽  
Selective Assembly

A Novel Uranyl Complex with Dimeric Lacunary Polyoxoanion: [(A-α-SiW9O33)2K{UO2(H2O)}2]11−

2006 ◽  
Vol 18 (2) ◽  
pp. 396-405 ◽  
Author(s):  
Ya-Guang Chen ◽  
Fan-Xia Meng ◽  
Hai-Jun Pang ◽  
Dong-Mei Shi ◽  
Yu Sun
Keyword(s):  
Uranyl Complex
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