Synthesis, X-ray crystallography, thermal studies, spectroscopic and electrochemistry investigations of uranyl Schiff base complexes

Asadi, Zahra; Shorkaei, Mohammad Ranjkesh

doi:10.1016/j.saa.2012.12.024

Cited by 19 publications

(8 citation statements)

References 16 publications

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“…These data indicated that the two wings of the uranylsalophens were similar to those of birds and the uranyl-salpohen molecules were distorted in the plane. The average bond lengths No.3 of the U-N, U-O, and U＝O in the receptors were consistent with the experimental results very well 33 . The carbon-carbon bond lengths of the benzene rings in the three kinds of receptors were 0.1365-0.1435 nm.…”

Section: Geometrical Structures Of Receptorssupporting

confidence: 89%

Molecular Recognition of α, β-Unsaturated Carbonyl Compounds and Chiral Guests by Uranyl-Salophen Receptors

高莎¹,

兰文波²,

林英武³

et al. 2016

Acta Physico-Chimica Sinica

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Based on density functional theory (DFT) calculations, the molecular recognition of α,β-unsaturated carbonyl compounds and chiral molecules by uranyl-salophen receptors was investigated theoretically. The results showed that the U atom of the receptors was coordinated by the O3 atom of the guests, and the binding energies between receptors and guests increased with the enlargement of the aromatic substituent of the uranylsalophen receptors. In addition, the U-O3 coordination bonds of R2-and R3-series complexes are more stable than those of R1-series complexes, and the conjugation between the C＝C and C＝O bonds of the α,βunsaturated carbonyl compounds in the coordination complexes was weakened. Moreover, according to circular dichroism (CD) spectra and binding-energy calculations, the molecular-recognition selectivity of an asymmetrical pyrenyl uranyl-salophen (receptor 3) for (R)-1-(2-naphthyl)ethylamine was much higher than that for (S)-1-(2naphthyl)ethylamine. These results shed new light on the recognition ability of asymmetric uranyl-salophens.

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Section: Geometrical Structures Of Receptorssupporting

confidence: 89%

Molecular Recognition of α, β-Unsaturated Carbonyl Compounds and Chiral Guests by Uranyl-Salophen Receptors

高莎¹,

兰文波²,

林英武³

et al. 2016

Acta Physico-Chimica Sinica

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“…24 Most non-aqueous uranyl reduction reactions exploit complexes of multidentate ligands (e.g. 2 x acac, 25 salen, 26 and pacman 27 ) which satisfy the 2+ charge of the uranyl dication whilst minimizing equatorial ligand exchange and disproportionation. In contrast, uranyl complexes of monoanionic multidentate ligand environments which allow coordination of equatorial X-ligands are less studied.…”

Section: Introductionmentioning

confidence: 99%

Uranyl to Uranium(IV) Conversion through Manipulation of Axial and Equatorial Ligands

et al. 2018

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The controlled manipulation of the axial oxo and equatorial halide ligands in the uranyl dipyrrin complex, UOCl(L), allows the uranyl reduction potential to be shifted by 1.53 V into the range accessible to naturally occurring reductants that are present during uranium remediation and storage processes. Abstraction of the equatorial halide ligand to form the uranyl cation causes a 780 mV positive shift in the U/U reduction potential. Borane functionalization of the axial oxo groups causes the spontaneous homolysis of the equatorial U-Cl bond and a further 750 mV shift of this potential. The combined effect of chloride loss and borane coordination to the oxo groups allows reduction of U to U by H or other very mild reductants such as Cp*Fe. The reduction with H is accompanied by a B-C bond cleavage process in the oxo-coordinated borane.

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“…In our previous study, we gave a detailed description of previous work cited on literature on the isothermal and non-isothermal decomposition of AUC. [8][9][10][11][12][13][14] In this work, isothermal decomposition of AUC compound has been examined using several characterization techniques. The purpose of this study is to carry out the uranium oxide powder characterization obtained from the isothermal decomposition of the AUC.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous study, we gave a detailed description of previous work cited on literature on the isothermal and non-isothermal decomposition of AUC. 8–14…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide

Korichi¹,

Nacera²,

Hanane³

et al. 2019

Progress in Reaction Kinetics and Mechanism

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The ammonium uranyl carbonate, (NH4)4UO2(CO3)3, is an important material used in UO2 and U3O8 ceramics production for the nuclear fuel fabrication. Thermal study and kinetic analysis of ammonium uranyl carbonate conversion under isothermal conditions has been studied in air atmosphere to obtain the tri-uranium octoxide (U3O8), using muffle furnace equipment, UV–visible spectrophotometer, gas adsorption, Hg porosimetry, laser granulometry, and optic spectroscopy. The textural properties (specific surface area, morphology, pore size, grain size, inter-particular porosity, and intra-particular porosity) and characteristics (uranium content and stoichiometry) of the prepared samples were estimated from the physical–chemical characterization. The kinetic parameters were estimated by a fitting of the experimental data. The activation energy Ea, frequency factor A, and reaction rate constants k were calculated from the conventional and iso-conversion kinetic models and were within the range of literature values. The activation energy average values are 36.69 and 30.36 kJ mol−1 by conventional and iso-conversion models, respectively.

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Synthesis, X-ray crystallography, thermal studies, spectroscopic and electrochemistry investigations of uranyl Schiff base complexes

Cited by 19 publications

References 16 publications

Molecular Recognition of α, β-Unsaturated Carbonyl Compounds and Chiral Guests by Uranyl-Salophen Receptors

Molecular Recognition of α, β-Unsaturated Carbonyl Compounds and Chiral Guests by Uranyl-Salophen Receptors

Uranyl to Uranium(IV) Conversion through Manipulation of Axial and Equatorial Ligands

Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide

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Synthesis, X-ray crystallography, thermal studies, spectroscopic and electrochemistry investigations of uranyl Schiff base complexes

Cited by 19 publications

References 16 publications

Molecular Recognition of α, β-Unsaturated Carbonyl Compounds and Chiral Guests by Uranyl-Salophen Receptors

Molecular Recognition of α, β-Unsaturated Carbonyl Compounds and Chiral Guests by Uranyl-Salophen Receptors

Uranyl to Uranium(IV) Conversion through Manipulation of Axial and Equatorial Ligands

Kinetic studies of isothermal decomposition of (NH4)4UO2(CO3)3 to uranium oxide

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Kinetic studies of isothermal decomposition of (NH₄)4UO₂(CO₃)₃ to uranium oxide