Synthesis, structures, and photoluminescent properties of two uranium complexes constructed by a flexible zwitterion ligand

Liang, Lingling; Zhang, Ronglan; Weng, Ng Seik; Zhao, Jianshe; Liu, Chiyang

doi:10.1016/j.inoche.2015.12.022

Cited by 19 publications

(11 citation statements)

References 27 publications

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“…Aqueous solutions of the ligands (0.1 mM) electrolyte without lipase presented conductivities of 12-13 mS cm -1 , which confirms an intense dissociation process of zwitterion structures according to reference [30]. In all systems, a constant decrease of conductivity in time was recorded with 2 mS cm -1 after the first and second day, and after that it remained almost constant ( Figure 2).…”

Section: Figure 1 Time Evolution Of Ph Of the Solutions Containing Tsupporting

confidence: 64%

The interactions between lipase and pyridinium ligands investigated by electrochemical and spectrophotometric methods

Patriche

Lupu

Cârâc

et al. 2016

J. Electrochem. Sci. Eng.

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The interaction between pyridinium ligands derived from 4,4’-bipyridine (N,N’-bis(p-bromophenacyl)-4,4’-bipyridinium dibromide – Lr) and (N,N’-bis(p-bromophenacyl)-1,2-bis (4-pyridyl) ethane dibromide – Lm) with lipase enzyme was evaluated. The stability of the pyridinium ligands, having an essential role in biological systems, in 0.1 M KNO3 as supporting electrolyte is influenced by the lipase concentration added. The pH and conductometry measurements in aqueous solution suggest a rapid ionic exchange process. The behavior of pyridinium ligands in the presence of lipase is investigated by cyclic voltammetry and UV/Vis spectroscopy, which indicated bindings and changes from the interaction between them. The voltammograms recorded on the glassy carbon electrode showed a more intense electronic transfer for the Lr interaction with lipase compared to Lm, which is due to the absence of mobile ethylene groups from Lr structure.

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Section: Figure 1 Time Evolution Of Ph Of the Solutions Containing Tsupporting

confidence: 64%

The interactions between lipase and pyridinium ligands investigated by electrochemical and spectrophotometric methods

Patriche

Lupu

Cârâc

et al. 2016

J. Electrochem. Sci. Eng.

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“…25 Very recently, two novel uranium complexes were reported involving the tripodal flexible zwitterion 1,1′,1″-(2,4,6-trimethylbenzene-1,3,5-triyl)-tris(methylene)-tris(pyridine-4-carboxylic acid) trichlorine (H 3 LCl 3 ). 26 This contribution is devoted to the reactivity of a ditopic carboxylate ligand bearing the imidazolium group (i.e., 1,3bis(carboxymethyl)imidazolium; noted imdc) with an aqueous uranyl nitrate solution under mild hydrothermal condition. Actually, this flexible zwitterionic dicarboxylate linker was mainly considered for the preparation of crystalline salts with alkaline-earth cations (Ca, Sr, Ba) 27 or for the formation coordination polymers with transition metals (Cu, Mn, Co, Zn), 28−30 lanthanides (La, Pr, Nd, Er), 31,32 or lead 33 metallic elements.…”

Section: ■ Introductionmentioning

confidence: 99%

Hydrothermal Crystallization of Uranyl Coordination Polymers Involving an Imidazolium Dicarboxylate Ligand: Effect of pH on the Nuclearity of Uranyl-Centered Subunits

et al. 2016

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Four uranyl-bearing coordination polymers (1-4) have been hydrothermally synthesized in the presence of the zwitterionic 1,3-bis(carboxymethyl)imidazolium (= imdc) anion as organic linkers after reaction at 150 °C. At low pH (0.8-3.1), the form 1 ((UO2)2(imdc)2(ox)·3H2O; ox stands for oxalate group) has been identified. Its crystal structure (XRD analysis) consists of the 8-fold-coordinated uranyl centers linked to each other through the imdc ligand together with oxalate species coming from the partial decomposition of the imdc molecule. The resulting structure is based on one-dimensional infinite ribbons intercalated by free water molecules. By adding NaOH solution, a second form 2 is observed for pH 1.9-3.9 but in a mixture with phase 1. The pure phase of 2 is obtained after a hydrothermal treatment at 120 °C. It corresponds to a double-layered network (UO2(imdc)2) composed of 7-fold-coordinated uranyl cations linked via the imdc ligands. In the same pH range, a third phase ((UO2)3O2(H2O)(imdc)·H2O, 3) is formed: it is composed of hexanuclear units of 7-fold- and 8-fold-coordinated uranyl cations, connected via the imdc molecules in a layered assembly. At higher pH, the chain-like solid (UO2)3O(OH)3(imdc)·2H2O (4) is observed and composed of the infinite edge-sharing uranyl-centered pentagonal bipyramidal polyhedra. As a function of pH, uranyl nuclearity increases from discrete 8- or 7-fold uranyl centers (1, 2) to hexanuclear bricks (3) and then infinite chains in 4 (built up from the hexameric fragments found in 3). This observation emphasized the influence of the hydrolysis reaction occurring between uranyl centers. The compounds have been further characterized by thermogravimetric analysis, infrared, and luminescence spectroscopy.

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“…The photoluminescence spectrum of uranium complexes appears as a broad peak in the range of 400–650 nm, and it can be detected with a microsecond lifetime. − The broad peak, which originates mainly within the uranyl ion, is a result of the transfer of an electron from the oxygen orbital to a vacant uranium 5f orbital. , The ultraviolet–visible (UV–vis) spectra of uranium complexes have been found to be more complicated when their equatorially coordinated ligands have a π-conjugation system, which then provokes other electronic transitions, including ligand-centered charge transfer. The conjugation system acts as an antenna and facilitates energy transfer; consequently, it influences the fluorescence wavelength by shifting its position. , …”

Section: Introductionmentioning

confidence: 99%

Introducing Bluish-Green Light-Emitting Diodes (OLEDs) and Tuning Their Color Intensity by Uranium Complexes: Synthesis, Characterization, and Photoluminescence Studies of 8-Hydroxyquinoline Complexes of Uranium

et al. 2020

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To improve our understanding of the chemistry of actinide complexes and to spur their development in the field of actinide markers, two new uranium complexes were synthesized using 8-hydroxyquinoline and 5,7-dichloro-8-hydroxyquinoline. The prepared complexes were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, ultraviolet− visible spectroscopy, elemental analysis, and single-crystal X-ray diffraction. The impact of the electron-withdrawing group of the ligand on the photoluminescence spectra of the complexes in solution and in the solid state was scrutinized. The bandgap of the complexes was calculated using the density functional theory (DFT) method to investigate the effects of the electron-withdrawing groups on energy levels. The synthesized uranium complexes demonstrated appropriate levels of the lowest unoccupied molecular orbital energy, leading to favorable dye stability. The prepared uranium complexes showed blue fluorescent emission, and the sample with the most intense fluorescence was used to construct bluish-green organic light-emitting diodes using simple solution processing fabrication methods. Absorbance spectra, emission spectra, DFTcalculated energy levels, and comparisons of the fabricated organic light-emitting diodes indicated that the electron-withdrawing group was a key factor in photoluminescence behavior.

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Synthesis, structures, and photoluminescent properties of two uranium complexes constructed by a flexible zwitterion ligand

Cited by 19 publications

References 27 publications

The interactions between lipase and pyridinium ligands investigated by electrochemical and spectrophotometric methods

The interactions between lipase and pyridinium ligands investigated by electrochemical and spectrophotometric methods

Hydrothermal Crystallization of Uranyl Coordination Polymers Involving an Imidazolium Dicarboxylate Ligand: Effect of pH on the Nuclearity of Uranyl-Centered Subunits

Introducing Bluish-Green Light-Emitting Diodes (OLEDs) and Tuning Their Color Intensity by Uranium Complexes: Synthesis, Characterization, and Photoluminescence Studies of 8-Hydroxyquinoline Complexes of Uranium

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