Uranyl ions, {UO2}n+ (n = 1, 2), display trans, strongly covalent, and chemically robust U-O multiple bonds, where 6d, 5f, 6p orbitals play important roles. The synthesis of isoelectronic analogues uranyl has been interest for quite some time, mainly with the purpose unveiling covalence 5f-orbital participation in bonding. Significant advances have occurred last two decades, initially marked by...

1,1?-Biphenyl-3,3?,4,4?-tetracarboxylic acid dianhydride has been reacted with uranyl nitrate under solvo-hydrothermal conditions and in the presence of different counterions to give three complexes varying periodicity. [Co(en)3]- [UO2(bptc)(HCOO)] ? 2.5H2O (1) crystallizes as a monoperiodic coordination polymer which bptc4? ligand is exclusively bound through formation two 7-membered chelate r...

In complexes with the uranyl dication salophen ligands are highly puckered. This implies that non-symmetrically substituted uranyl-salophen derivatives exist in principle as a pair of enantiomers. However, due to easy disrotations about the bonds connecting the phenoxide units to the imine carbons, the rate of interconversion between enantiomeric forms of simple, sterically unhindered compounds...

Uranyl-carboxyl-ate hybrid materials dominate the catalog of uranyl compounds owing in part to the affinity between COO(-) functional groups and UO2 (2+). Polycarboxyl-ate organic ligands may present a degree of steric hindrance and could thus influence the resulting uranyl topology. Single crystals of the title compound, {(NH4)2[(UO2)2(C12O12)(H2O)2]} n , were synthesized hydro-thermally as a ...

the stability constants of species present in the systems ni(ii)-pyridoxamine(pym)(a) and ni(ii)-pyridoxamine(pym)(a)-imidazole containing ligands(b) [b = imidazole(him),  benzimidazole(bim), histamine(hist) and l-histidine(his)] have been determined ph-metrically using the miniquad computer program. the existence of the species niah, nia and nia2 was proven for the ni(ii)-pym(a) system, wherea...

Multinuclear (1H and 13C) NMR, and Raman spectroscopy, combined with DFT calculations, provide detailed information on the complexation between U(vi) oxoions and 8-hydroxyquinoline-5-sulfonate (8-HQS) in aqueous solution. Over the concentration region studied, U(vi) oxoions (uranyl ions) form one dominant complex with 8-HQS in water in the pH range 3-6, a mononuclear 1 : 2 (metal : ligand) comp...

A polypyrrolic macrocycle with naphthalenyl linkers between the N(4)-donor compartments (L(2)) was designed theoretically according to its experimentally-known analogues with phenylenyl (L(1)) and anthracenyl (L(3)) linkers. The uranyl and bis(uranyl) complexes formed by this L(2) ligand have been examined using scalar-relativistic density functional theory. The calculated structural properties...

Resource shortage is a major problem in our world. Nuclear energy green and because of this its high density, it has been attracting more attention during the last few decades. Uranium valuable nuclear fuel used majority power plants. More than one thousand times uranium exists oceans, at very low concentrations, present terrestrial ores. As demand for generation increases year-on-year, access ...

Electrospray ionization was used to generate mono-positive gas-phase complexes of the general formula [UO2A(S)n]+ where A = OH, Cl, Br, I or ClO4, S = H2O, CH3OH or CH3CH2OH, and n = 1-3. The multiple-stage dissociation pathways of the complexes were then studied using ion-trap mass spectrometry. For H2O-coordinated cations, the dissociation reactions observed included the elimination of H2O li...